Antonio Bianconi

Superstripes · Rome International Center for Materials Science, Superstripes, RICMASS

Recently, the quest for high-Tc superconductors has evolved from the trial-and-error methodology to the growth of nanostructured artificial high-Tc superlattices (AHTSs) with tailor-made superconducting functional properties by quantum design. Here, we report the growth by molecular beam epitaxy (MBE) of a superlattice of Mott insulator metal inter...

While the search of high Tc superconductivity was driven mostly by trial and error methodology searching for novel materials, here we provide a quasi-first-principle quantum theory for engineering superconductivity in artificial high-Tc superlattices (AHTS) with period d, ranging from 5.28 down to 3 nanometers, made of superconducting quantum wells...

Recently, the quest for high-Tc superconductivity has evolved from the trial-and-error methodology to the growth of nanostructured artificial high-Tc superlattices (AHTS) with tailor-made superconducting functional properties by quantum design. Superlattices are composed of nanoscale superconducting units of modulation doped Mott insulator La2CuO4...

While the search for new high-temperature superconductors had been driven by the empirical “trials and errors” method for decades, we now report the synthesis of Artificial High-Tc Superlattices (AHTS) designed by quantum mechanics theory at the nanoscale. This discovery paves the way for engineering a new class of high-temperature superconductors,...

BaPb1−xBixO3 (BPBO) bismuthate, showing high TC superconductivity for 0.05 < x < 0.35, is an archetypal system for studying the complex inhomogeneity of perovskite lattice favoring the emergence of quantum coherence, called the superstripes phase. Local lattice fluctuations, detected by EXAFS; nanoscale stripes, detected by electron microscopy; and...

Fast and local probes, such as X-ray spectroscopy, X-ray diffraction (XRD), and X-ray microscopy, have provided direct evidence for nanoscale phase separation in high temperature perovskite superconductors composed of (i) free particles coexisting with (ii) Jahn Teller polarons (i.e., charges associated with local lattice distortions) not detected...

While it is known that a resonant amplification of [Formula: see text] in two-gap superconductors can be driven by using the Fano–Feshbach resonance tuning the chemical potential near a Lifshitz transition, little is known on tuning the [Formula: see text] resonance by cooperative interplay of the Rashba spin–orbit coupling (RSOC) joint with phonon...

While understanding the time evolution of Covid-19 pandemic is needed to plan economics and tune sanitary policies, a quantitative information of the recurrent epidemic waves is elusive. This work describes a statistical physics study of the subsequent waves in the epidemic spreading of Covid-19 and disclose the frequency components of the epidemic...

While it is known that a resonant amplification of Tc in two-gap superconductors can be driven by using the Fano-Feshbach resonance tuning the chemical potential near a Lifshitz transition, little is known on tuning the Tc resonance by cooperative interplay of the Rashba spin-orbit coupling (RSOC) joint with phonon mediated (e-ph) pairing at select...

Novel nanoscale probes are opening new venues for understanding unconventional electronic and magnetic functionalities driven by multiscale lattice complexity in doped high-temperature superconducting perovskites. In this work, we focus on the multiscale texture at supramolecular level of oxygen interstitial (O-i) atomic stripes in HgBa2CuO4+y at o...

While stripe phases with broken rotational symmetry of charge density are known to emerge in doped strongly correlated perovskites, the dynamics and heterogeneity of spatial ordering remain elusive. Here we shed light on the temperature dependent lattice motion and the spatial nanoscale phase separation of charge density wave order in the archetypa...

While understanding of periodic recurrent waves of Covid-19 epidemics would aid to combat the pandemics, quantitative analysis of data over a two years period from the outbreak, is lacking. The complexity of Covid-19 recurrent waves is related with the concurrent role of i) the containment measures enforced to mitigate the epidemics spreading ii) t...

While stripe phases with broken rotational symmetry of charge density appear in many complex correlated systems, the heterogeneity of spatial ordering and dynamics remains elusive. This missing info is at the heart of understanding the structure and function relation in quantum complex materials. We focus here on the spatial heterogeneity of the mo...

While understanding of periodic travelling waves (PTW) of Covid-19 epidemics would aid to combat the pandemics, quantitative analysis of data over a two years period from the outbreak, is lacking. The complexity of Covid-19 PTW is related with the concurrent role of i) the containment measures enforced to mitigate the epidemics spreading ii) the ra...

While spin striped phases in La2−xSrxNiO4+y for 0.25 < x < 0.33 are the archetypal case of a 1D spin density wave (SDW) phase in doped antiferromagnetic strongly correlated perovskites, few information is available on the SDW spatial organization. In this context, we have measured the spatial variation of the wave vector of the SDW reflection profi...

Nanoscale phase separation (NPS) characterized by particular types of correlated disorder plays an important role in the functionality of high temperature superconductors (HTS). Our results show that multiscale heterogeneity is an essential ingredient of quantum functionality in complex materials. Here, the interactions developing between different...

The maximum critical temperature for superconductivity in pressurized hydrides appears at the top of superconducting domes in Tc vs pressure curves at a particular pressure, which is not predicted by standard superconductivity theories. The high-order anisotropic Van Hove singularity near the Fermi level observed in band-structure calculations of p...

Nanoscale phase separation (NPS), characterized by particular types of correlated disorders, plays an important role in the functionality of high-temperature superconductors (HTS). Our results show that multiscale heterogeneity is an essential ingredient of quantum functionality in complex materials. Here, the interactions developing between differ...

While the maximum critical temperature $T_{Cmax}$ for superconductivity in pressurized sulfur hydrides appears in the range $203<T_{Cmax}<287$ K at the top of a superconducting dome in the $T_C$ versus pressure P curves, standard superconductivity theories do not predict the superconducting domes. Filling this gap, we provide a first principles qua...

The control of Covid 19 epidemics by public health policy in Italy during the first and the second epidemic waves has been driven by using reproductive number R t (t) to identify the supercritical (percolative), the subcritical (arrested), separated by the critical regime. Here we show that to quantify the Covid-19 spreading rate with containment m...

While the mathematical laws of uncontrolled epidemic spreading are well known, the statistical physics of coronavirus epidemics with containment measures is currently lacking. The modelling of available data of the first wave of the Covid-19 pandemic in 2020 over 230 days, in different countries representative of different containment policies is r...

Recently room temperature superconductivity with Tc=15 degrees Celsius has been discovered in a pressurized complex ternary hydride, CSHx, which is a carbon doped H3S alloy. The nanoscale structure of H3S is a particular realization of the 1993 patent claim of superlattice of quantum wires for room temperature superconductors where the maximum Tc o...

Recently room temperature superconductivity with IMG ALIGN="MIDDLE"ALT="$T_C=15$ "SRC="epl20559ieqn1.gif"/> degrees Celsius has been discovered in a pressurized complex ternary hydride, CSH x , which is a carbon- and hydrogen-doped H3S alloy. The nanoscale structure of H3S is a particular realization of the 1993 patent claim of superlattice of quan...

The control of Covid 19 epidemics by public health policy in Italy during the first and the second epidemic waves has been driven by using reproductive number Rt(t) to identify the supercritical (percolative), the subcritical (arrested), separated by the critical regime. Here we show that to quantify the Covid-19 spreading rate with containment mea...

It is well known that the critical temperature of multigap superconducting three-dimensional (3D) heterostructures at atomic limit (HAL) made of a superlattice of atomic layers with an electron spectrum made of several quantum subbands can be amplified by a shape resonance driven by the contact exchange interaction between different gaps. The TC am...

So far most of the analysis of coronavirus 2020 epidemic data has been focusing on a short-time window and consequently a quantitative test of statistical physical laws of Coronavirus Epidemics with Containment Measures (CEwCM) is currently lacking. Here we report a quantitative analysis of CEwCM over 230 days, covering the full-time lapse of the f...

Preliminary evidence for the occurrence of high-Tc superconductivity in alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were recently obtained by magnetic susceptibility measurements and by the opening of a large superconducting gap as measured by ARPES and STM techniques. In this work, KPT samples have been synthesized b...

Preliminary evidence for the occurrence of high-T C superconductivity in alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were recently obtained by magnetic susceptibility measurements and by the opening of a large superconducting gap as measured by ARPES and STM techniques. In this work, KPT samples have been synthesized...

The Covid-19 epidemic of the novel coronavirus (severe acute respiratory syndrome [SARS]-CoV-2) has been spreading around the world. While different containment policies using nonpharmaceutical interventions have been applied, their time evolution and efficiency are not known quantitatively. We show here that the measure of the doubling time Td(t)...

While in XX century the theory of superconductivity has focused on a homogeneous metal with a rigid lattice which can be reduced to a single effective conduction band in the dirty limit. Today in the XXI century, the physics of superconductivity is focusing on complexity of quantum matter where novel quantum functionalities with lattice inhomogenei...

While different containment measures of the Covid-19 epidemic have been applied recently a quantitative measure of their efficiency is not available. We show here that the time evolution of the pandemic doubling time Td(t) is a reliable measure of the efficiency of the Lockdown, Case Finding, Mobile Tracing (LFT) policy using modern technologies ve...

Here, we focus on the data analysis of the growth of epidemic spread of Covid-19 in countries where different policies of containment were activated. It is known that the growth of pandemic spread at its threshold is exponential, but it is not known how to quantify the success of different containment policies. We identify that a successful approac...

Here we focus on the data analysis of the growth of epidemic spreading of Covid 19 in countries where a different policy of containment has been activated. It is known that at the threshold of the pandemic spreading the growth is exponential with a doubling time Td between 1.8 and 2.8 days. However it is not known how different containment policies...

Living matter is a quasi-stationary out-of-equilibrium system; in this physical condition, structural fluctuations at nano- and meso-scales are needed to understand the physics behind its biological functionality. Myelin has a simple ultrastructure whose fluctuations show correlated disorder in its functional out-of-equilibrium state. However, ther...

Ninety years of X-ray spectroscopy research in Italy, from the X-rays discovery (1896), and the Fermi group theoretical research (1922-1938) to the Synchrotron Radiation research in Frascati from 1963 to 1986 are here summarized showing a coherent scientific evolution which has evolved into the actual multidisciplinary research on complex phases of...

The basic features of multi-band superconductivity and its implications are derived. In particular, it is shown that enhancements of the superconducting transition temperature take place due to interband interactions. In addition, isotope effects differ substantially from the typical BCS scheme as soon as polaronic coupling effects are present. Spe...

The basic features of multi-band superconductivity and its implications are derived. In particular, it is shown that enhancements of the superconducting transition temperature take place due to interband interactions. In addition, isotope effects differ substantially from the typical BCS scheme as soon as polaronic coupling effects are present. Spe...

In several strongly correlated electron systems, the short range ordering of defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials. La1.72Sr0.28NiO4 is a prototypical...

Superstripes 2019, Ischia June 23-29, 2019 VI the dome of the critical temperature [13] has stimulated the proposal of the key role of the and the joint role of local strain [14-16] and pressure with doping, to drive a cuprate perovskite to the maximum Tc= 160K in the proximity of Lifshitz transitions. The emerging complex scenario of coexisting an...

The book "Superstripes 2019" reports the last research advances on the Physics of "Quantum Complex Matter" presented in Ischia (Italy) on June 23-29, 2019 covering the new fields of "Topological Superconductivity" "Spintronics" "Complex Magnetic Phases" "Majorana Fermions" "Skirmions" etc. This series of conferences started with the first stripes c...

Doping and strain dependences of the electronic structure of the CuO6-octahedra layer within LDA+GTB method in the frameworks of six-band p-d model are calculated. Band structure and Fermi surface of the quasiparticle excitations in the effective Hubbard model are characterized by inhomogeneous distribution of the k-dependent spectral weight. Dopin...

In this review article we consider theoretically and give experimental support to the models of the Fermi-Bose mixtures and the BCS-BEC (Bardeen Cooper Schrieffer–Bose Einstein) crossover compared with the strong-coupling approach, which can serve as the cornerstones on the way from high-temperature to room-temperature superconductivity in pressuri...

In this review article we consider theoretically and give experimental support to the models of the Fermi-Bose mixtures and the BCS-BEC crossover compared with the strong-coupling approach, which can serve as the cornerstones on the way from high-temperature to room-temperature superconductivity in pressurized metallic hydrides. We discuss some key...

In several strongly correlated electron systems, defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials. La1.72Sr0.28NiO4 is a prototypical strongly correlated material...

Living matter is a quasi-stationary out-of-equilibrium system; in this physical condition, structural fluctuations at nano- and meso-scales are needed to understand the physics behind its biological functionality. Myelin has a simple ultrastructure whose fluctuations show correlated disorder in its functional out-of-equilibrium state. However, ther...

Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles and nanoscale phase separation in doped perovskites. It is known that the striped phases in doped perovskites are due to competing interactions involving charge, spin, and lattice degrees of freedom. In this work, we show that two different stripes can...

Out-of-equilibrium phenomena are attracting high interest in physics, materials science, chemistry and life sciences. In this state, the study of structural fluctuations at different length scales in time and space are necessary to achieve significant advances in the understanding of the structure-functionality relationship. The visualization of pa...

Out-of-equilibrium phenomena are attracting high interest in physics, materials science, chemistry and life sciences. In this state, the study of structural fluctuations at different length scales in time and space are necessary to achieve significant advances in the understanding of structure-functionality relationship. The visualization of patter...

Local and fast structural probes using synchrotron radiation have shown nanoscale striped puddles and nanoscale phase separation in doped perovskites.It is known that the striped phases in doped perovskites are due to competing interactions involving charge, spin and lattice degrees of freedom,but while many theoretical models for spin and charge s...

There is growing compelling experimental evidence that a quantum complex matter scenario made of multiple electronic components and competing quantum phases is needed to grab the key physics of high critical temperature ( T c ) superconductivity in layered cuprates. While it is known that defect self-organization controls T c , the mechanism remain...

There is a growing compelling experimental evidence that a quantum complex matter scenario made of multiple electronic components, and competing quantum phases is needed to grab the key physics of high critical temperature (Tc) superconductivity in layered cuprates. While it is known that defects self-organization controls Tc, the mechanism remains...

Doping and strain dependences of the electronic structure of the CuO6-octahedra layer within LDA+GTB method in the frameworks of six-band p-d model are calculated. Band structure and Fermi surface of the quasiparticle excitations in the effective Hubbard model are characterized by inhomogeneous distribution of the k-dependent spectral weight. Dopin...

While new functional doped magnetic materials are developed and used in modern nanotechnology the physics of these complex systems is object of active discussions. The multi-scale lattice and electronic complexity from nanoscale to mesoscale in cuprates [1-3], diborides [4,5] and iron based superconductors [6,7] using diffraction and x-ray absorpti...

Papers presented at the UGO FANO SYMPOSIUM 2016 held in Rome Dec. 19-21 , 2016

The volume No. 13 of Superstripes Press contain the scientific results presented by invited scientists and presented at the Quantum Complex Matter – QCM 2018 Workshop and FCMP School hekd in Frascati, Rome, Italy on June 11-15, 2018. It was organized by the Rome Int. Center Materials Science RICMASS, SUPERSTRIPES; Laboratori Nazionali di Frascati...

Papers presented at the "Majorana Fermions and Topological Materials Science" Workshop held in Erice, Italy on July 21-27, 2018 and 75th Course of the Solid State Physics School organized by «Ettore Majorana» Foundation and Centre for Scientific Culture, Topological Materials Science (TMS), project Japan, and the Rome Int. Center Materials Science...

Metamaterials. Complex Quantum Matter, Fano Resonances

20th Anniversary of Stripes Conferences, Physics in Quantum Matter, Superconductivity, Magnetism & Ferroelectricity

New superconducting materials with higher critical temperature have been discovered by the “trial-and-error” method of problem solving and accordingly the critical temperature increased linearly with time since 1911. P REFACE S UPERSTRIPES AND H ETEROSTRUCTURES AT A TOMIC L IMIT Antonio Bianconi Rome international Center for Materials Science Super...

Abstracts of the lectures given at the the International conference SUPERSTRIPES 2014, Erice, Italy July 19 – 25, 2014 and 64° course of the International School of Solid State Physics directed by Giorgio Benedek

Book of Abstracts of the lectures given at the the International school “MULTI-CONDENSATES SUPERCONDUCTIVITY” Erice, Italy July 19 – 25, 2014 Organized by the non profit research organization Superstripes onlus Rome International Center for Materials Science - RICMASS In collaboration with: Moore Foundation Ettore Majorana Foundation and Centre for...

Abstracts of selected advanced research works on “Quantum Phenoma in Complex Matter” presented at the 8th International Conference of the series on Stripes and High Tc Superconductivity, STRIPES 11, heald at Sapienza University of Rome, Rome Italy, July 10 - 16, 2011

Communications presented at the first Symposium on Quantum Physics of Living Matter QPLM-2011 heald at Sapienza University of Rome, Rome, Italy July 12-13, 2011

At the topological Lifshitz transition for the appearing of a new Fermi surface spot in a multi-valley superconducting material, the BPV (Bianconi-Perali-Valletta) theory [1-11] has predicted the emergence of Bose Einstein Condensation BEC. The BPV numerical solution of the self-consistent anisotropic energy gap equation joint with the chemical-pot...

Recently interest is growing on unconventional high-temperature superconductivity in 2D anisotropic organic conductors made of non connected but weakly interacting quantum wires [1-7]. In a recent work [8], we have proposed a driving mechanism for high Tc based on the control of the Fano resonance between a first superconducting gap in a first cond...

The quantum mechanism to push the critical temperature toward room temperature topological superconductivity (RTTS) was proposed on Dec 7, 1993 [1-3]. This theory provides indications for the design of quantum material made of heterostructures at atomic limit. made of stacks of quantum wells or. Practical realizations of this theory are the arrays...

It has recently been established that the high-transition-temperature (high-T c) superconducting state coexists with short-range charge-density-wave order and quenched disorder arising from dopants and strain. This complex, multiscale phase separation invites the development of theories of high-temperature superconductivity that include complexity.

After decades of search for the mechanism that allows a macroscopic quantum coherent electronic state to resist to the de-coherence attacks of high temperature the key ingredients have been established. The material design to get the Tc amplification by a Fano or shape resonance at a topological Lifshitz transition proposed in 1993 was based on the...

The recent discovery of superconductivity in a metallic aromatic hydrocarbon, alkali-doped p-Terphenyl, has attracted considerable interest. The critical temperature Tc ranges from few to 123 K, the record for organic superconductors, due to uncontrolled competition of multiple phases and dopant concentration. In the proposed mechanism of Fano reso...

The two-dimensional Bi2Sr2CaCu2O8+y (Bi2212), the most studied prototype cuprate superconductor, is a lamellar system made of a stack of two-dimensional corrugated CuO2 bilayers separated by Bi2O2+ySr2O2 layers. While the large majority of theories, proposed to interpret unconventional high Tc superconductivity in Bi2Sr2CaCu2O8+y, assume a centrosy...

While recent experiments have found that at optimum doping for the highest critical temperature in HgBa$_2$CuO$_{4+y}$ (Hg1201) the oxygen interstitials (O-i) are not homogeneously distributed but form one-dimensional atomic wires, there are no available information of its electronic structure considering self-organized O-i atomic wires. Here we re...

How the macroscopic quantum coherence can resist to the decoherence attacks of high temperature is a major challenge for the science of the 21st century. Superstripes 2017 conference held in Ischia on June 2017 has been focused on the new physics of high $T_c$ superconductors made of complex quantum matter. Today the standard model of high $T_c$ su...

While it is known that strongly correlated transition metal oxides described by multi-band Hubbard model show microscopic multiscale phase separation little is known on the possibility to manipulate them with vacuum ultraviolet (VUV) 27 eV lighting. We have investigated the photo-induced effects of VUV illumination of a super-oxygenated La2NiO4+y s...

While it is known that strongly correlated transition metal oxides described by multi-band Hubbard model show microscopic multiscale phase separation little is known on the possibility to manipulate them with vacuum ultraviolet (VUV) 27 eV lighting. We have investigated the photo-induced effects of VUV illumination of a super-oxygenated La2NiO4+y s...