Jozef T. Devreese

Fröhlich polaron and bipolaron: recent developments

It is remarkable how the Frohlich polaron, one of the simplest examples of a Quantum Field Theoretical problem, as it basically consists of a single fermion interacting with a scalar Bose field of ion displacements, has resisted full analytical or numerical solution at all coupling since ~1950, when its Hamiltonian was first written. The field has been a testing ground for analytical, semi-analytical and numerical techniques, such as path integrals, strong-coupling perturbation expansion, advanced variational, exact diagonalization (ED) and quantum Monte Carlo (QMC) techniques. This paper reviews recent developments in the field of continuum and discrete (lattice) Frohlich (bi)polarons starting with the basics and covering a number of active directions of research.

Electronic structure, dynamics, and quantum structural properties of condensed matter

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Ab initio calculation of phonon spectra

Semiconductors and Insulators.- Dielectric Properties and Lattice Dynamics of Semiconductors.- Ab-initio Calculation of the Lattice Dynamics of Si: Dielectric Screening Theory.- Comments on Computational Methods for Structural Energies of Semiconductors.- A Definitione Calculation of Structure and Lattice Dynamics of GaAs.- Lattice Dynamics of Cuprite (Cu2O).- Metals And Metallic Compounds.- Lattice Vibrations in Simple Metals.- The Thermal Properties of Metallic Sodium near Melt from Molecular Dynamics Calculation.- Phonons in Amorphous Metals.- Phonons and Electron-Phonon Coupling in Metals.- Surfaces.- Acoustic and Optical Surface Phonons.- Greens Function Calculation of Surface Phonons in Ionic Crystals.- Theory of Electron-Phonon Interaction and its Influence on Reconstruction of Semiconductor Surfaces.- Frequencies of Longitudinal Vibrations of a Two-Dimensional Wigner Crystal coupled to Ripplons on the Surface of Liquid Helium.- Author Index.

Advances in polaron physics

Continuum Polaron.- Lattice Polaron.- Bipolaron.- Multipolaron Problem.- Polarons and Bipolarons in Advanced Materials.- Current Status of Polarons and Open Problems.

Elementary excitations in solids, molecules, and atoms

Phonons.- Electronic Influence on Lattice Dynamics.- Phonon Calculations in Metals and Insulators.- Excitations in Superfluid Helium.- Hydrodynamic Excitations in Anharmonic Crystals and in Ferromagnets.- Electron-Phonon Interactions.- Electron Interaction with Surface Modes.- Electronic Transitions and Relaxation Phenomena in Polarons.- The Self-Energy Problem in Quantum Dielectrics.- Electrons and Phonons in Narrow Gap Semiconductors.- Light Scattering in Solids.- Resonant Raman Scattering in Semiconductors.- Seminars.- Formalism of an Ab Initio Calculation of Phonon Dispersion Curves in the Hartree-Fock Approximation (Abstract).- Two-Phonon Deformation Potentials, Second Order Raman Scattering, and Superconductivity in Degenerate Semiconductors.- Temperature Dependence of Free Polaron Optical Absorption.- Peierls-Frohlich Instability and Superconductivity in Linear Chain Crystals.- The Absorption and the Ground State Energy of Free Polarons.- Experimental Studies on Insulators and Metals.- A Review of the Experimental Properties of Insulating Solids.- Optical Absorption and Photoemission Experiments on Metals and Alloys.- Author Index to Part B.- Subject Index to Part B.

Theory of electron energy spectrum and Aharonov-Bohm effect in self-assembled Inx Ga1-x As quantum rings in GaAs

We analyze theoretically the electron energy spectrum and the magnetization of an electron in a strained

Frohlich Polarons from 0D to 3D: Concepts and Recent Developments‡

{\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}∕\mathrm{Ga}\mathrm{As}

Bound vortex dipoles generated at pinning centres by Meissner current

self-assembled quantum ring (SAQR) with realistic parameters, determined from the cross-sectional scanning-tunneling microscopy characterization of that nanostructure. The SAQRs have an asymmetric indium-rich craterlike shape with a depression rather than an opening at the center. Although the real SAQR shape differs strongly from an idealized circular-symmetric open ring structure, the Aharonov-Bohm oscillations of the magnetization survive.

Photoluminescence spectra of quantum dots : enhanced efficiency of the electron-phonon interaction

I analyse our present understanding of the Frohlich polaron with emphasis on the response properties, in particular optical absorption.

Characterization of self-assembled quantum dots using the phonon-induced features of PL spectra

One of the phenomena that make superconductors unique materials is the Meissner-Ochsenfeld effect. This effect results in a state in which an applied magnetic field is expelled from the bulk of the material because of the circulation near its surface of resistance-free currents, also known as Meissner currents. Notwithstanding the intense research on the Meissner state, local fields due to the interaction of Meissner currents with pinning centres have not received much attention. Here we report that the Meissner currents, when flowing through an area containing a pinning centre, generate in its vicinity two opposite sense current half-loops producing a bound vortex-antivortex pair, which eventually may transform into a fully developed vortex-antivortex pair ultimately separated in space. The generation of such vortex dipoles by Meissner currents is not restricted to superconductors; similar topological excitations may be present in other systems with Meissner-like phases.