Mukunda Das

• Doctor of Philosophy, IIT, Roorkee (formerly known as Univ of Roorkee)
• Professor at Australian National University

Quantum kinetic theory is founded upon the action of the conservation laws within systems that may be both strongly driven and subject to strong interparticle couplings. For any open mesoscopic conductor, conservation must act globally as well as microscopically. In maintaining global conservation, the explicit interplay of the mesoscopic device an...

Practical mesoscopic devices based on quantum point contacts (QPCs) must function at operating point involving large internal driving fields. Experimental evidence has accumulated to display anomalous nonlinear features of QPC response beyond the capacities of accepted tunnelling-based models of nonlinear quantum transport. Here, we recall the phys...

Practical mesoscopic devices must function at operating points involving large internal driving fields. Experimental evidence has long accumulated that certain apparently anomalous nonlinear features of quantum transport lie beyond the descriptive capacity of accepted models. We review the physical setting for these anomalous effects and suggest ho...

Applying the directionality of an acoustic meta-lens, a sound reception system for ships is designed. A two-dimensional disk shape acoustic meta-lens or an acoustic Luneburg lens made of 253 acrylic pipes of different radii which control the refractive index is used. The lens has the diameter of 180 cm and the thickness of 20 cm. Eight microphones...

We report on a singular departure from the canonical step sequence of quantized conductance in a ballistic, quasi-one-dimensional metallic channel. Ideally in such a structure each sub-band population contributes its conductance quantum independently of the rest. In a picture based exclusively on coherent single-carrier transmission, unitary back-s...

Unlike conventional materials like metals, insulators, semiconductors, composites etc., the smart materials are designed properties that can be engineered in several ways. Metamaterials appear as a class of smart materials, which are fabricated from assemblies of multiple elements from composite materials, such as metals or plastics metamaterials m...

We report on a striking departure from the canonical step sequence of quantized conductance in a ballistic, quasi-one-dimensional metallic channel. Ideally, in such a structure, each sub-band population contributes its Landauer conductance quantum independently of the rest. In a picture based exclusively on coherent single-carrier transmission, uni...

Over the last decade, interest in one-dimensional charge transport has progressed from the seminal discovery of Landauer quantization of conductance, as a function of carrier density, to finer-scale phenomena at the onset of quantization. This has come to be called the "0.7 anomaly", rather connoting a theoretical mystery of some profundity and uni...

An earthquake-proof seismic negative belt of an artificial seismic shadow zone is introduced. The belt is composed of acoustic materials which has one of the constituent parameter between density and modulus is negative effectively. It converts the velocity of the seismic wave imaginary, and then creates a stop-band for the seismic frequency range....

Over the last decade, interest in 1D charge transport has progressed from the seminal discovery of Landauer quantization of conductance, as a function of carrier density, to finer-scale phenomena at the onset of quantization. This has come to be called the '0.7 anomaly', rather connoting a theoretical mystery of some profundity and universality, wh...

A principle of an acoustic Eaton lens array and its application as a removable tsunami wall is proposed theoretically. The lenses are made of expandable rubber pillars or balloons and create a stop-band by rotating the incoming tsunami wave and reduce the pressure by canceling each other. The diameter of each lens is larger than the wavelength of t...

A principle of an acoustic Eaton Lens array and its application as a removable tsunami wall is proposed theoretically. The lenses are made of expandable rubber pillars or balloons and create a stop-band by the rotating the incoming tsunami wave and reduce the pressure by canceling each other. The diameter of each lens is larger than the wavelength...

The Fermi surface is an abstract object in the reciprocal space of a crystal lattice, enclosing the set of all those electronic band states that are filled according to the Pauli principle. Its topology is dictated by the underlying lattice structure and its volume is the carrier density in the material. The Fermi surface is central to predictions...

We begin with an introduction of superconductivity by giving a brief history of the phenomenon. The phenomenological Ginzburg─Landau theory and the microscopic theory of Bardeen, Cooper and Schrieffer are outlined. In view of recently available multi-band superconductors, relevant theories of both types are discussed. Unlike the traditional GL theo...

Anomalies often occur in the physical world. Sometimes quite unexpectedly anomalies may give rise to new insight to an unrecognized phenomenon. In this paper we shall discuss about Kohn anomaly in a conventional phonon-driven superconductor by using a microscopic approach. Recently Aynajian et al.'s experiment showed a striking feature; the energy...

The recently discovered multiband superconductors have created a new class of novel superconductors. In these materials multiple superconducting gaps arise due to the formation of Cooper pairs on different sheets of the Fermi surfaces. An important feature of these superconductors is the interband couplings, which not only change the individual gap...

Science, in particular physics, is a collective enterprise and is so because it is, itself, a fruit of the exquisitely social nature of human living. So it is inevitable to encounter ethical issues in the natural sciences, since the contest of differing interests and views is perennial in its practice, indeed essential to its momentum. The crucial...

The recently discovered multiband superconductors have created a new class of novel superconductors. In these materials multiple superconducting gaps arise due to the formation of Cooper pairs on different sheets of the Fermi surfaces. An important feature of these superconductors is the interband couplings, which not only change the individual gap...

In three-band BCS superconductors with repulsive inter-band interactions, frustration between the bands can lead to an inherently complex gap function, arising out of a phase difference between the bands in the range 0 and π. Since the complex conjugate of this state is also a solution, the ground state is degenerate, and there appears a time-rever...

We present a theoretical analysis of the Kohn singularity and Kohn anomaly in the superconducting phase of a three-dimensional metallic system. We show that a phonon mechanism-based Cooper pairing in a Fermi liquid metal can lead to these phenomena quite naturally. The results are discussed against the background of some recent experimental finding...

We developed a new method of earthquake-proof engineering to create an artificial seismic shadow zone using acoustic metamaterials. By designing huge empty boxes with a few side-holes corresponding to the resonance frequencies of seismic waves and burying them around the buildings that we want to protect, the velocity of the seismic wave becomes im...

It is suggested that the mechanism for superconductivity proposed by Witten for cosmic strings can also occur in the laboratory. Each term in Witten’s Lagrangian has an analogue in the theory of condensed matter physics. The parameters in condensed matter are many orders of magnitude different from those in cosmic strings. Some estimates of the pos...

The recent article "Ohm's Law Survives to the Atomic Scale" by Weber et al. [Science 335, 64 (1021)] reveals ohmic transport in quantized P-in-Si wires. We argue that their results have two main deficiencies: (a) the interpretation of conductance data is inadequate for serious systematics; (b) metallic-like structures hold few implications for quan...

Models of nonequilibrium quantum transport underpin all modern electronic devices, from the largest scales to the smallest. Past simplifications such as coarse graining and bulk self-averaging served well to understand electronic materials. Such particular notions become inapplicable at mesoscopic dimensions, edging towards the truly quantum regime...

Models of nonequilibrium quantum transport underpin all modern electronic devices, from the largest scales to the smallest. Past simplifications such as coarse graining and bulk self-averaging served well to understand electronic materials. Such particular notions become inapplicable at mesoscopic dimensions, edging towards the truly quantum regime...

Ultraviolet (UV) photoluminescence (PL) data taken on a double Au implanted Si matrix are reported. This has been studied over a wide temperature range of 28–220 K. At low temperature, the spectrum shows four peaks corresponding to a zero-phonon line (ZPL) and three low-energy phonon-assisted lines. At 28 K the ZPL has an energy of 3.362 eV with a...

We developed a new method of an earthquake-resistant design to support conventional aseismic system using acoustic metamaterials. The device is an attenuator of a seismic wave that reduces the amplitude of the wave exponentially. Constructing a cylindrical shell-type waveguide composed of many Helmholtz resonators that creates a stop-band for the s...

In the absence of a consensus for the correct microscopic theory for high temperature superconductivity we have devoted earlier efforts to obtain a generalised Ginzburg-Landau (GL) phenomenological model. Originally the main motivation was to examine how GL theory could be generalised. Neglecting secondary order parameters like structural distortio...

We suggest that crucial effect on Bose-Einstein condensation in systems with attractive potential is three-body interaction. We investigate stationary solutions of the Gross-Pitaevskii equation with negative scattering length and a higher-order stabilising term in presence of an external parabolic potential. Stability properties of the condensate a...

In this note we are communicating the results obtained on various samples of lanthanum-based cuprate in which Sr and Zn have been partially substituted for La and Cu, respectively over a range where the superconductivity is gradually destroyed. The decrease in Tc is accompanied by a changeover from metallic to semiconducting-like resistance behavio...

Superconductivity is an unanticipated phenomenon and its hundred-year history is a fascinating subject in physical science. The fact that certain materials below a critical temperature lose their electrical resistance and repel a magnet remained a miracle until a microscopic explanation became available in 1957. In this pedagogic article we present...

Kohn anomaly occurs in metals as a weak but discernible kink in the phonon spectrum around 2kF arising out of screened Coulombic interaction. Over the years this has been observed in a number of normal metallic systems. As a major surprise however, the recent neutron spin–echo experiments on elemental (conventional) superconductors Pb and Nb reveal...

In mesoscopic systems three significant issues are of pivotal importance: (i) due to the smallness of their size, quantum effects are crucial, (ii) for the same reason, the surface-to-volume ratio is large and this characteristic feature induces certain unique and fascinating effects, and (iii) the system remains in active contact with its environm...

Kohn anomaly occurs in metals as a weak but discernible kink in the phonon spectrum around 2kF arising out of screened Coulombic interaction. Over the years this has been observed in a number of normal metallic systems. As a major surprise however, the recent neutron spin-echo experiments on elemental (conventional) superconductors Pb and Nb reveal...

The magnetic vortices in superconductors usually repel each other. Several cases are discussed when the vortex interaction has an attractive tail and thus a minimum, leading to vortex clusters and chains. Decoration pictures then typically look like in the intermediate state of type-I superconductors, showing lamellae or islands of Meissner state o...

Divergence exponents of the first-order quantum correction of a two-dimensional hard-sphere Bose atoms are obtained by an effective field theory method. The first-order correction to the ground-state energy density with respect to the zeroth-order is given by $\mathcal{E}_1/\mathcal{E}_0\sim |D-2|^{-\alpha}|\ln\gamma|^{-\alpha'}$, where D is the sp...

Superconductivity was an unanticipated property of matter. Perhaps no history of a scientific subject is as impressive as the history of superconductivity. Over the past nine decades the history remains exciting, where some of our best minds were and are engaged on understanding how this remarkable property is manifested in some materials under cer...

Having driven a large part of the decade's progress in physics, nanoelectronics is now passing from today's realm of the extraordinary to tomorrow's commonplace. This carries the problem of turning proofs of concept into practical artefacts. Better and more sharply focussed predictive modelling will be the ultimate guide to optimising mesoscopic te...

Having driven a large part of the decade's progress in physics, nanoelectronics is now passing from today's realm of the extraordinary to tomorrow's commonplace. This carries the problem of turning proofs of concept into practical artefacts. Better and more sharply focused predictive modelling will be the ultimate guide to optimizing mesoscopic tec...

Where, and how, does energy dissipation of electrical energy take place in a ballistic wire? Fully two decades after the advent of the transmissive phenomenology of electrical conductance, this deceptively simple query remains unanswered. We revisit the quantum kinetic basis of dissipation and show its power to give a definitive answer to our query...

The derivation for collective modes of an interacting Bose gas trapped by an isotropic harmonic oscillator potential is presented using field-theoretic method. The presence of the two-body scattering term beyond the mean-field is seen to appear inevitably in the calculations, even in the simplest approximation. As a result we see the occurrence of...

The derivation for collective modes of an interacting Bose gas trapped by an isotropic harmonic oscillator potential is presented using field-theoretic method. The presence of the two-body scattering term beyond the mean-field is seen to appear inevitably in the calculations, even in the simplest approximation. As a result we see the occurrence of...

The ground-state energy density of an interacting dilute Bose gas system is studied in the canonical transformation scheme. It is shown that the transformation scheme enables us to calculate a higher order correction of order na³ in the particle depletion and ground-state energy density of a dilute Bose gas system, which corresponds to the density...

Interacting Bose gas confined by an external potential is studied using Green functions in spectral representation. The calculation is presented transparently using the equation of motion method. With this, the interplay between the condensed and the non-condensed atoms is inevitably seen. An expression for the condensate number at finite temperatu...

Interacting Bose gas confined by an external potential is studied using Green functions in spectral representation. The calculation is presented transparently using the equation of motion method. With this, the interplay between the condensed and the non-condensed atoms is inevitably seen. An expression for the condensate number at finite temperatu...

In his article "Quantum ballistics" (August pp27–30), Andrei Sokolov claims that in 1957 the late Rolf Landauer predicted the electrical conductance of a narrow 1D conductor is quantized in units of 2e²/h, where e is the electronic charge, h is Planck's constant and the factor of two reflects the fact that electrons have two possible spin orientati...

The extended Hubbard model with nearest neighbor hopping and intersite interaction for a 2D square lattice has been studied within the frame work of a simple mean-field formalism. The self-consistent solutions of superconducting order parameters have been obtained for various fillings. The results indicate that superconducting pairing occurs on dop...

The extended Hubbard model with nearest neighbor hopping and intersite interaction for a 2D square lattice has been studied within the frame work of a simple mean-field formalism, The self-consistent solutions of superconducting order parameters have been obtained for various fillings. The results indicate that superconducting pairing occurs on dop...

Until the mid-1980s, condensed matter physicists were contented with the nearly independent electron model or quasiparticle picture developed out of weakly interacting Fermions. Discoveries of high Tc superconductivity in oxides and other exotic systems, namely heavy Fermion systems, colossal magnetoresistive manganites, metal-insulator transition...

Until the mid-1980s, condensed matter physicists were contented with the nearly independent electron model or quasiparticle picture developed out of weakly interacting Fermions. Discoveries of high Tc superconductivity in oxides and other exotic systems, namely heavy Fermion systems, colossal magnetoresistive manganites, metal-insulator transition...

The macroscopic occupation of atoms in the ground state of an interacting Bose gas confined by an external harmonic potential is calculated as a function of the interaction strength. The effect of the inter-atomic interaction to the ground state distribution is discussed.

We remark on some delicate points that attend the physical meaning of intrinsic device resistance.

Study of Bose-Einstein condensation (BEC) is undergoing worldwide explosion both experimentally and theoretically. It is of particular interest to the theorists to investigate a weakly interacting condensed Bose gas, externally confined by various geometries. In this work we report the role of inter-atomic interaction on the condensed phase of a Bo...

In the ballistic limit, the Landauer conductance steps of a mesoscopic quantum wire have been explained by coherent and dissipationless transmission of individual electrons across a one-dimensional barrier. This leaves untouched the central issue of conduction: a quantum wire, albeit ballistic, has finite resistance and so must dissipate energy. Ex...

The understanding of mesoscopic transport has now attained an ultimate simplicity. Indeed, orthodox quantum kinetics would seem to say little about mesoscopics that has not been revealed - nearly effortlessly - by more popular means. Such is far from the case, however. The fact that kinetic theory remains very much in charge is best appreciated thr...

The standard physical model of contemporary mesoscopic noise and transport consists in a phenomenologically based approach, proposed originally by Landauer and since continued and amplified by Büttiker, Imry and others. Throughout all the years of its gestation and growth, it is surprising that the Landauer–Büttiker approach to meso-scopics has mat...

Reznikov et al. (Phys. Rev. Lett. 75, 3340 (1995)) have presented definitive observations of nonequilibrium noise in a quantum point contact. Especially puzzling is the "anomalous" peak structure of the excess noise measured at constant current; to date it remains unexplained. We show that their experiment directly reveals the deep link between con...

We summarize the main results of a microscopically based kinetic theory, applicable to open quantum point contacts (QPCs) driven up to high fields. The governing role of gauge invariance -- and the many-body sum rules for the electron gas -- lead to stringent constraints on both transport and fluctuations. These constraints exert a dominant influen...

Reznikov et al. [Phys. Rev. Lett. 75, 3340 (1995)]] have presented definitive observations of nonequilibrium noise in a quantum point contact. Especially puzzling is the "anomalous" peak structure of the excess noise measured at constant current; to date it remains unexplained. We show that their experiment directly reveals the deep link between co...

The conserving sum rules for the electron gas form a set of fundamental and powerful constraints on the description of electronic transport, at any length scale. We examine the particular role of the compressibility sum rule for open mesoscopic conductors, and show that the compressibility in such systems is absolutely invariant under nonequilibriu...

The nature of the electron gas is characterized, above all, by its multi-particle correlations. The conserving sum rules for the electron gas have been thoroughly studied for many years, and their centrality to the physics of metallic conduction is widely understood (at least in the many-body community). We review the role of the conserving sum rul...

The Landauer formula for dissipationless conductance lies at the heart of modern electronic transport, yet it remains without a clear microscopic basis. We analyse the Landauer formula microscopically and give a straightforward quantum kinetic derivation for open systems. Some important experimental implications follow. These lie beyond the Landaue...

We review the conceptual structure of the Landauer theory of electron transport in the light of quantum kinetics, the orthodox framework for describing conductance at all scales. In a straightforward analysis, we assess popular claims for a rational link between Landauer theory on the one hand, and orthodox microscopics on the other. The need to ex...

Quantum kinetic theory is founded upon the action of the conservation laws within systems that may be both strongly driven and subject to strong interparticle couplings. For any open mesoscopic conductor, conservation must act globally as well as microscopically. In maintaining global conservation, the explicit interplay of the mesoscopic device an...

Elementary electronic excitation is studied theoretically for a two-dimensional electron gas in the presence of spin?orbit (SO) interaction induced by the Rashba effect. We find that in such a system, coupled plasmon?phonon excitation can be achieved via intra-?and inter-SO electronic transitions. As a result, six branches of the coupled plasmon?ph...

We show that a completely orthodox and conserving Landau-Silin approach to current fluctuations in quantum point contacts accounts for the major, and as yet unexplained, peak structures observed in the QPC experiment of Reznikov et al. [Phys. Rev. Lett. 75, 3340 (1995)], for constant values of source-drain current. Those features are absent from co...

Transport of charge carriers can be controlled by doping through chemical and physical means. Unlike chemical doping, physical doping is carried out by a special technique through gate voltages in a field-effect transistor geometry. This technique keeps the carrier channels free from defects without complications from the crystalline structure and...

Electron transport in metallic systems is governed by four key principles of Fermi-liquid physics: (i) degeneracy, (ii) charge conservation, (iii) screening of the Coulomb potential, and (iv) scattering. They determine the character of metallic conduction and noise at mesoscopic scales, both near equilibrium and far from it. Their interplay is desc...

We study the problem of dynamical response and plasma mode dispersion in strongly coupled two-dimensional Coulomb fluids (2DCFs) in the weakly degenerate quantum domain. Adapting the nonlinear response function approach of Golden and Kalman [Phys. Rev. A 19, 2112 (1979)] to the 2DCF, we construct a self-consistent approximation scheme for the calcu...

The authors establish formulas for the isothermal compressibility and long-wavelength static density-density response function of a weakly correlated two-dimensional electron gas in the 1<beta epsilon(F)<infinity and 0< or =beta epsilon(F)<1 degeneracy domains; beta epsilon(F)=pi n Planck's over 2 pi(2)/(mk(B)T). The calculation of the pressure in...

Microscopic current fluctuations are inseparable from conductance. We give an integral account of both quantized conductance and nonequilibrium thermal noise in one-dimensional ballistic wires. Our high-current noise theory opens a very different window on such systems. Central to the role of nonequilibrium ballistic noise is its direct and robust...

We examine critically the idea that fractional charges may carry electrical current in a conductor, much as do the normal electrons in a metallic Fermi liquid. We explore a range of issues that have gained the status of indispensability for analyzing conductance and shot noise in fractionally charged systems. For these fundamental transport problem...

Shot noise is not normally evident in bulk solid-state conductors, since it is strongly attenuated by inelastic collisions. The ``anomalous'' emergence of macroscopic shot noise is discussed in G. Gomila and L. Reggiani, Phys. Rev. B 62, 8068 (2000). We remark on the consistency of this linear diffusive model at the large voltages and currents need...

A Comment on the Letter by Serguei B. Isakov, Thierry Martin, and Stephane Ouvry, Phys. Rev. Lett. 83, 580 (1999). The authors of the Letter offer a Reply.

There has been renewed interest in the physics of the so-called crossover for current fluctuations in mesoscopic conductors, most recently involving the possibility of its appearance in the passage to the macroscopic limit. Shot noise is normally absent from solid-state conductors in the large, and its anomalous resurgence there has been ascribed t...

Isakov, Martin, and Ouvry [PRL 83, 580 (1999)] have recently proposed a fresh approach to the potential observation of fractional exclusion statistics. According to their argument, a clear signature of fractional statistics should exist in the shot noise of a Luttinger fluid, an ideal system postulated by some to underlie the well-founded Laughlin...

We analyze high-field current fluctuations in degenerate conductors by mapping the electronic Fermi-liquid correlations at equilibrium to their semiclassical non-equilibrium form. Our resulting Boltzmann description is applicable to diffusive mesoscopic wires. We derive a non-equilibrium connection between thermal fluctuations of the current and re...

It is well known that bosonic particles with attractive interaction in a uniform gas do not form a condensate. Here we investigate a dilute Bose gas and study stationary solutions of the Gross–Pitaevskii equation with attractive interaction. We have also used a higher order stabilising term in the presence of a harmonic confining potential. We show...

Coulomb screening, together with degeneracy, is characteristic of the metallic electron gas. While there is little trace of its effects in transport and noise in the bulk, at mesoscopic scales the electronic fluctuations start to show appreciable Coulomb correlations. Within a strictly standard Boltzmann and Fermi-liquid framework, we analyze these...

In the theory of noise processes for mesoscopic conductors, the relationship between shot noise and hot-electron noise is absolutely fundamental to understanding the underlying microscopic fluctuations. From the vantage point of orthodox microscopics and kinetics, their relation is a long way from being settled. Its resolution calls for the tools o...

We argue, physically and formally, that existing diffusive models of noise yield inaccurate microscopic descriptions of nonequilibrium current fluctuations. The theoretical shortfall becomes pronounced in quantum-confined metallic systems, such as the two-dimensional electron gas. In such systems we propose a simple experimental test of mesoscopic...

Since the recent discovery of the high-temperature superconductors, there have been many ideas put forward to explain the phase diagram. One of the most important parts of this phase diagram is the so called irreversible line. The majority opinion is that this line represents a phase transition from a flux line solid to a flux line fluid, that is a...

It is shown that the occurrence of negative dispersion in the ion plasma branch of a two-component plasma of electrons and ions can lead to a sharp increase in the binding energy of Cooper pairs. The analysis is generalised to a multicomponent plasma with many ionic species, and the applicability of this model to high-Tc superconducting materials i...

This paper gives an analysis of the dependence of the strength of the deformation potential on the dimensionality of the solid. The model chosen to represent the electron gas interacting with the background of ions is the 2Dand 3D-deformable jellium. It is shown that the strength of the deformation potential in 2D-deformable jellium is higher than...

A low-temperature self-consistent calculation of the density of states (DOS) and of the exchange-enhanced g factor is presented for heterostructures in a strong transverse magnetic field. Landau level mixing in the self-energy, the energy shift and the interaction of an electron with remote and background impurities, with piezoelectronic and acoust...

Electrical transport properties of La2-xSrxCuO4 up to x=0.4 have been systematically investigated. A gradual change taking place in the sequences semiconducting-non-superconducting, semiconducting-superconducting, metallic-superconducting and metallic-non-superconducting has been observed. The results provide the experimental evidence for a transit...

The generalized gradient approximation (GGA) for the exchange-correlation energy has recently become available in a simple form that can be used in place of the local density approximation (LDA). We have applied this simplified GGA within a self-consistent LMTO method to study the equilibrium volume and bulk moduli of 3d and 4d transition metals. W...

We analyse high-field current fluctuations in metallic systems by direct mapping of the Fermi-liquid correlations to the semiclassical nonequilibrium state. We give three applications. First, for bulk conductors, we show that there is a unique nonequilibrium analogue to the fluctuation-dissipation theorem for thermal noise. With it, we calculate su...

X-ray diffraction and AC susceptibility measurements have been carried out on LaBaCaCu3−xMxO7 (RE:1113) system, where M=Co, Ni, Ga with x=0.0, 0.06, 0.08, 0.24 and 0.30. X-ray diffraction results show that these cations substitute isostructurally in the tetragonal La:1113 phase, with decreased c-parameter for Co and Ga and nearly unchanged for Ni,...

We investigate superconducting pairing of electrons when coupled to an adjacent layer of holes in a GaAs semiconductor heterostructure. When the density of the electrons is much higher than the density of holes, the repulsive electron-electron interaction is reduced by dynamical coupling to the strongly correlated holes. For the effective-mass rati...

Density functional theory (DFT) is considered as the standard model for low/very low energy physics. The theory appeared with its full glory when Hohenberg and Kohn [1] proved that the ground state properties of an interacting many body system can be described by a functional of the one-particle density of the system. The theory has a rigorous form...

The physics of many interacting particles is notoriously difficult. The attraction of density functional theory is that it facilitates approximate calculations on many-body systems without requiring the construction of many-body wavefunctions or their equivalent. Instead one extracts the needed information from a one-body quantity, the number densi...

This book is an outcome of the International Workshop on Electronic Density Functional Theory, held at Griffith University in Brisbane, Australia, in July 1996. Density functional theory, standing as it does at the boundary between the disciplines of physics, chemistry, and materials science, is a great mixer. Invited experts from North America, Eu...

We review a semiclassical theory of high-field noise in degenerate conductors, based on propagator solutions to the Boltzmann equation for the fluctuation distribution function. The theory provides a microscopic description of correlation-induced suppression of noise in quantum-confined systems, such as heterojunction devices. It is also capable of...

We suggest that when zinc is substituted for copper in the high Tc superconductors, it does not necessarily have a valency of 2+. Rather, the valency of a zinc impurity should be determined by its surrounding medium. To elaborate on this, we examine the effect of static impurities inducing diagonal disorder within a one band Hubbard model coupled t...

In this work we present a theoretical treatment of electron ejection from a clean metallic semi-infinite solid with an ideal orthorhombic Bravais lattice following the impact of moderately fast charged particles with respect to the Fermi momentum of the initially bound electron. For an aluminum semi-infinite solid target multiple differential cross...