Florian Aigner

Florian Aigner
TU Wien | TU Wien · Department of Public Relations

Dr.

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16
Publications
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219
Citations
Introduction
Skills and Expertise

Publications

Publications (16)
Cover Page
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The first dissertation concerning itself with very special hard materials at the Technical University of Vienna (TU Vienna) was completed 50 years ago-since then Cermets has become a global success. Cermets are especially hard materials, that can be used, for instance, in cutting tools. Hard and wear resistant materials are indispensable for indust...
Article
Quantum diffraction of fast atoms scattered from the topmost layer of surfaces under grazing angles of incidence can be employed for the analysis of detailed structural properties of insulator surfaces. From comparison of measured and calculated diffraction patterns we deduce the rumpling of the topmost surface layer of LiF(001) (i.e., an inward sh...
Article
Rainbow scattering for grazing-angle incidence of atoms at surfaces along low-indexed channeling directions provides a sensitive probe of quasistatic atom-surface potentials. The dependence of the rainbow angle on the kinetic energy for the projectile motion perpendicular to the surface, E⊥, varies with the electronic structure of the projectile as...
Article
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Fast helium atoms diffracted at alkali-halide surfaces under grazing angles of incidence exhibit intriguing diffraction patterns. The persistence of quantum coherence is remarkable, considering high surface temperatures and high (keV) kinetic energies of the incident atoms. Dissipative and decohering effects such as the momentum transfer between th...
Article
Scattering of fast neutral atoms with keV kinetic energies at alkali-halide surfaces under grazing angles displays intriguing diffraction patterns. The surprisingly strong persistence of quantum coherence despite the impulsive interaction with an environment at solid state density and elevated temperatures raises fundamental questions such as to th...
Article
Full-text available
Diffraction of fast helium atoms at alkali-halide surfaces under grazing angles of incidence shows intriguing diffraction patterns. The persistence of quantum coherence is remarkably strong, even though high surface temperatures and high (keV) kinetic energies of the incident atoms would strongly suggest the dominance of dissipative and decohering...
Article
Scattering of fast neutral atoms with keV kinetic energies at alkali-halide surfaces under grazing angles displays intriguing diffraction patterns (Schuller, Wethekam and Winter 2007, Roisseau et al. 2007). In spite of the impulsive interaction with a surface at elevated temperature, which results in phonon excitation, quantum coherence evidently p...
Article
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We investigate the shot noise in phase-coherent transport through quantum cavities by a two dimensional ab-initio simulation of the scattering problem. In particular, we study the influence of quantum scattering mechanisms on the transport statistics by tuning the strength of a disorder potential and the openings of the dot. For small cavity openin...
Article
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We investigate the statistical distribution of transmission eigenvalues in phase-coherent transport through quantum dots. In two-dimensional ab-initio simulations for both clean and disordered two-dimensional cavities, we find markedly different quantum-to-classical crossover scenarios for these two cases. In particular, we observe the emergence of...
Article
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We investigate the role of disorder and diffractive scattering in the shot noise power of quantum transport through a two-dimensional quantum dot. By tuning the strength of the disorder potential and the openings of the dot, we numerically explore the influence of quantum scattering mechanisms on the current shot noise. For small cavity openings we...
Article
Full-text available
We study the shot noise by numerically simulating phase-coherent transport through a quantum dot. The chaotic-to-regular crossover regime of shot noise suppression is investigated explicitly by tuning the disorder potential and the openings of the dot. Employing the Modular Recursive Green's Function Method we obtain results for the Fano factor in...
Article
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We investigate the shot noise for phase-coherent quantum transport in the chaotic-to-regular crossover regime. Employing the modular recursive Green's function method for both ballistic and disordered two-dimensional cavities, we find the Fano factor and the transmission eigenvalue distribution for regular systems to be surprisingly similar to thos...
Conference Paper
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We present a numerical method which allows to efficiently calculate quantum transport through phase-coherent scattering structures, so-called “quantum billiards”. Our approach consists of an extension of the commonly used Recursive Green’s Function Method (RGM), which proceeds by a discretization of the scattering geometry on a lattice with nearest...
Article
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In this letter we will dicuss the possibility of a resummation procedure in order to cure the UV/IR-mixing problem of noncommutative field theories. The method is presented for a scalar phi^4 theory on Euclidean space. Finally, we sketch the idea of resummation for U(1)-gauge theories. Comment: 9 pages, uses bbm
Article
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Graphene [1, 2], the rst true two-dimensional (2D) solid, is attracting con-siderable attention mostly due to unique dynamics of electrons near the Fermi energy which closely mimics that of a massless Dirac Hamiltonian. Moreover, the double cone structure near the K and K points of the sub-lattices in reciprocal space gives rise to a near pseudo-sp...
Article
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Closed billiards have long served as prototype systems in the field of clas-sical and quantum dynamics [1]. Studying the motion of a particle on a two-dimensional confined surface contributed enormously to an understanding of dynamical phenomena. Since the behaviour of the billiard system strongly depends on the geometry of the limiting boundary, r...

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