The Experts below are selected from a list of 6279 Experts worldwide ranked by ideXlab platform
Alexander Volya - One of the best experts on this subject based on the ideXlab platform.
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Super‐radiance and open quantum systems
AIP Conference Proceedings, 2005Co-Authors: Alexander Volya, Vladimir ZelevinskyAbstract:Quantum wires, loosely bound nuclei, molecules in chemical reactions and exotic narrow pentaquark states are different examples of open quantum Mesoscopic systems. The coupling with and through continuum is their common feature. We discuss general properties of quantum systems in the regime of strong continuum coupling, when the mechanism of Dicke super‐radiance changes intrinsic dynamics, signatures of quantum chaos, lifetime of unstable states and reaction cross sections. The examples are shown for various areas of Mesoscopic Physics.
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Nuclear Structure, Random Interactions and Mesoscopic Physics
Physics Reports, 2004Co-Authors: Vladimir Zelevinsky, Alexander VolyaAbstract:Standard concepts of nuclear Physics explaining the systematics of ground state spins in nuclei by the presence of specific coherent terms in the nucleon-nucleon interaction were put in doubt by the observation that these systematics can be reproduced with high probability by randomly chosen rotationally invariant interactions. We review the recent development in this area, along with new original results of the authors. The self-organizing role of geometry in a finite Mesoscopic system explains the main observed features in terms of the created mean field and correlations that are considered in analogy to the random phase approximation.
Yoseph Imry - One of the best experts on this subject based on the ideXlab platform.
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Mesoscopic Physics and the Fundamentals of Quantum Mechanics
Physica Scripta, 1998Co-Authors: Yoseph ImryAbstract:We start by reviewing some interesting results in Mesoscopic Physics illustrating nontrivial insights on Quantum Mechanics. We then review the general principles of dephasing (sometimes called "decoherence") of Quantum-Mechanical interference by coupling to the environment degrees of freedom. A particular recent example of dephasing by a current-carrying (nonequilibrium) system is then discussed in some detail. This system is itself a manifestly Quantum Mechanical one and this is another illustration of detection without the need for "classical observers" etc. We conclude by describing briefly a recent problem having to do with the orbital magnetic response of conduction electrons (another manifestly Quantum Mechanical property): The magnetic response of a normal layer (N) coating a superconducting cylinder (S). Some recent very intriguing experimental results on a giant paramagnetic component of this response are explained using special states in the normal layer. It is hoped that these discussions illustrate not only the vitality and interest of Mesoscopic Physics but also its extreme relevance to fundamental issues in Quantum Mechanics.
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Mesoscopic Physics and the Fundamentals of Quantum Mechanics
Physica Scripta, 1998Co-Authors: Yoseph ImryAbstract:We start by reviewing some interesting results in Mesoscopic Physics illustrating nontrivial insights on Quantum Mechanics. We then review the general principles of dephasing (sometimes called "decoherence") of Quantum-Mechanical interference by coupling to the environment degrees of freedom. A particular recent example of dephasing by a current-carrying (nonequilibrium) system is then discussed in some detail. This system is itself a manifestly Quantum Mechanical one and this is another illustration of detection without the need for "classical observers" etc. We conclude by describing briefly a recent problem having to do with the orbital magnetic response of conduction electrons (another manifestly Quantum Mechanical property): The magnetic response of a normal layer (N) coating a superconducting cylinder (S). Some recent very intriguing experimental results on a giant paramagnetic component of this response are explained using special states in the normal layer. It is hoped that these discussions illustrate not only the vitality and interest of Mesoscopic Physics\cite{book} but also its extreme relevance to fundamental issues in Quantum Mechanics.Comment: 25 pages 3 eps figure
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Introduction to Mesoscopic Physics
1997Co-Authors: Yoseph Imry, Michael TinkhamAbstract:Preface Preface to the second edition List of symbols 1. Introduction and a brief review of experimental systems 2. Quantum transport, Anderson Localization 3. Dephasing by coupling with the environment, application to Coulomb electron-electron interactions in metals 4. Mesoscopic effects in equilibrium and static properties 5. Quantum interference effects in transport properties, the Landauer formulation and applications 6. The Quantum Hall Effect 7. Mesoscopics with superconductivity 8. Noise in Mesoscopic systems 9. Concluding remarks A. The Kubo, linear response, formulation B. The Kubo-Greenwood Conductivity and the Edwards-Thouless Relationships C. The Aharonov-Bohm Effect and the Byers-Yang and Bloch Theorem D. Derivation of matrix elements in the diffusion regime E. Careful treatment of dephasing in 2D conductors at low temperatures F. Anomalies in the density of states (DOS) G. Quasiclassical theory of spectral correlations H. Details of the four-terminal formulation I. Universality of the conductance fluctuations in terms of the universal correlation of transmission eigenvalues J. The conductance of ballistic 'point contacts'
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Recent developments in Mesoscopic Physics
Solid State Communications, 1994Co-Authors: Yoseph Imry, U. SivanAbstract:Abstract We review developments in quasi particle level response to external perturbations, correlated tunneling through isolated impurities, the persistent current problem, and Mesoscopic effects related to superconductivity.
Vladimir Zelevinsky - One of the best experts on this subject based on the ideXlab platform.
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nuclei and Mesoscopic Physics workshop on nuclei and Mesoscopic Physics wnmp 2007 east lansing michigan 20 22 october 2007
2008Co-Authors: P Danielewicz, Piotr Piecuch, Vladimir ZelevinskyAbstract:Mesoscopic Physics unifies physical systems in between microworld and macroworld. Such systems are sufficiently large to reveal certain statistical regularities, but they are sufficiently small to allow physicists to study, both theoretically and experimentally, individual quantum states. The conference covers common and specific features of those systems (nuclei, complex atoms and molecules, atomic traps, sold state micro- and nano-devices, prototypes of future quantum computers). This young field is rapidly developing opening new ideas and technological breakthroughs.
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Super‐radiance and open quantum systems
AIP Conference Proceedings, 2005Co-Authors: Alexander Volya, Vladimir ZelevinskyAbstract:Quantum wires, loosely bound nuclei, molecules in chemical reactions and exotic narrow pentaquark states are different examples of open quantum Mesoscopic systems. The coupling with and through continuum is their common feature. We discuss general properties of quantum systems in the regime of strong continuum coupling, when the mechanism of Dicke super‐radiance changes intrinsic dynamics, signatures of quantum chaos, lifetime of unstable states and reaction cross sections. The examples are shown for various areas of Mesoscopic Physics.
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Nuclear Structure, Random Interactions and Mesoscopic Physics
Physics Reports, 2004Co-Authors: Vladimir Zelevinsky, Alexander VolyaAbstract:Standard concepts of nuclear Physics explaining the systematics of ground state spins in nuclei by the presence of specific coherent terms in the nucleon-nucleon interaction were put in doubt by the observation that these systematics can be reproduced with high probability by randomly chosen rotationally invariant interactions. We review the recent development in this area, along with new original results of the authors. The self-organizing role of geometry in a finite Mesoscopic system explains the main observed features in terms of the created mean field and correlations that are considered in analogy to the random phase approximation.
K B Efetov - One of the best experts on this subject based on the ideXlab platform.
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supersymmetry in quantum chaos and Mesoscopic Physics
Physica D: Nonlinear Phenomena, 1995Co-Authors: K B EfetovAbstract:Abstract A brief review of the supersymmetry method and its application to Mesoscopic Physics and quantum chaos is given. Although a nonlinear supermatrix σ-model in this approach was derived from models with random potential, it is emphasized that the zero-dimensional version of the σ-model is equivalent to the random matrix theory and can even be derived from the latter, too. This gives a possibility to use the zero-dimensional model for description of problems of quantum chaos and Mesoscopic Physics. A number of problems considered recently is presented. This includes nuclear magnetic resonance in small metal particles and statistics of conductance fluctuations in quantum dots. The solution of these problems became possible due to a new possibility to calculate distribution functions.
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Supersymmetry in quantum chaos and Mesoscopic Physics
Physica D: Nonlinear Phenomena, 1995Co-Authors: K B EfetovAbstract:A brief review of the supersymmetry method and its application to Mesoscopic Physics and quantum chaos is given. Alghough a non-linear supermatrix $% \sigma $-model in this approach was derived from models with random potential, it is emphasized that the zero-dimensional version of the $\sigma $-model is equivalent to the random matrix theory and can even be derived from the latter, too. This gives a possibility to use the zero -dimensional model for description of problems of quantum chaos and Mesoscopic Physics. A number of problems considered recently is presented. This includes nuclear magnetic resonance in small metal particles and statistics of conductance fluctuations in quantum dots. The solution of these problems became possible due to a new possibility to calculate distribution functions. (Expanded version of a lecture given at the 14 Annual CNLS Conference "Quantum Complexity in Mesoscopic Systems" (Los Alamos, May 1994))
G Montambaux - One of the best experts on this subject based on the ideXlab platform.
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Mesoscopic Physics of electrons and photons
2007Co-Authors: Eric Akkermans, G MontambauxAbstract:1. Introduction: Mesoscopic Physics 2. Wave equations in random media 3. Perturbation theory 4. Probability of quantum diffusion 5. Properties of the diffusion equation 6. Dephasing 7. Electronic transport 8. Coherent backscattering of light 9. Diffusing wave spectroscopy 10. Spectral properties of disordered metals 11. Universal conductance fluctuations 12. Correlations of speckle patterns 13. Interactions and diffusion 14. Orbital magnetism and persistent currents 15. Formulary Index.
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Mesoscopic Physics of photons
Journal of the Optical Society of America B, 2004Co-Authors: Eric Akkermans, G MontambauxAbstract:We review the general features of coherent multiple scattering of electromagnetic waves in random media. In particular, coherent backscattering and angular correlation functions of speckle patterns are studied in some detail. We present a general formalism based on a physically intuitive description that also permits us to derive quantitative expressions. Then, the notion of phase boxes describing the quantum crossings of diffusons is discussed. This notion permits us to understand the long-range correlations that are at the origin of most of the Mesoscopic effects either for electrons or photons. Then, we turn to the problem of decoherence, namely, the washing out of interference effects. We use as an example the effect of a nondeterministic motion of the scatterers. We discuss some applications of these ideas to diffusive wave spectroscopy, including calculations of the intensity–time correlation function in the presence of quantum crossings.
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Mesoscopic Physics on graphs
Physics-Uspekhi, 2001Co-Authors: G MontambauxAbstract:This report is a summary of recent work on the properties of phase coherent diffusive conductors, especially in the geometry of networks — also called graphs — made of quasi-1D diffusive wires. These properties are written as a function of the spectral determinant of the diffusion equation (the product of its eigenvalues). For a network with N nodes, this spectral determinant is related to the determinant of an N × N matrix which describes the connectivity of the network. I also consider the transmission through networks made of 1D ballistic wires and show how the transmission coefficient can be written in terms of an N × N matrix very similar to the above one. Finally I present a few considerations on the relation between the magnetism of noninteracting systems and the magnetism of interacting diffusive systems.