Journal ArticleDOI
Theory of bipolarons and bipolaronic bands
A. S. Alexandrov,J. Ranninger +1 more
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In this article, the authors examined the electronic excitation spectrum of a bipolaronic crystal and showed that in the low bipolaron density limit the spectrum is superfluidlike, so that bipolarons might be superconducting.Abstract:
It is shown that in narrow-band crystals with sufficiently strong electron-lattice interaction a new energy band occurs. The tunneling motion of localized electron pairs (bipolarons), which is responsible for this band, is caused by virtual transitions of bipolarons to the polaron state. The electronic excitation spectrum of a bipolaronic crystal is examined. It is shown that in the low bipolaron-density limit the excitation spectrum is superfluidlike, so that bipolarons might be superconducting. In case of high density of bipolarons and their strong repulsion, a charge-density wave is predicted.read more
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Journal ArticleDOI
Fröhlich polaron and bipolaron: recent developments
J. T. Devreese,A. S. Alexandrov +1 more
TL;DR: The field of continuum and discrete Frohlich polaron (bi) polarons has been studied extensively in the literature starting with the basics and covering a number of active directions of research as mentioned in this paper.
Journal ArticleDOI
Froehlich Polaron and Bipolaron: Recent Developments
Jozef Devreese,Sasha Alexandrov +1 more
TL;DR: The field of continuum and discrete Froehlich polaron (bi)polarons has been a testing ground for analytical, semi-analytical, and numerical techniques, such as path integrals, strong-coupling perturbation expansion, advanced variational, exact diagonalisation (ED), and quantum Monte Carlo (QMC) techniques as mentioned in this paper.
Journal ArticleDOI
From electron to small polaron: An exact cluster solution.
TL;DR: It is shown that the self-consistent Migdal approximation is violated at an intermediate value of the coupling constant λ≃1 and the adiabatic or nonadiabatic small polaron is the ground state for the intermediate and strong coupling λ>1.
Journal ArticleDOI
A comparative study of (BI)polaronic (super)conductivity in high- and low-Tc superconducting oxides
TL;DR: In this article, a comparative study of the conductivity and superconductivity mechanisms in the series of superconducting oxides is made, where the authors claim that all these materials can be viewed as doped semiconductors, where conductivity is due to doping or self-doping.
Journal ArticleDOI
Colloquium : Electron-lattice interaction and its impact on high T c superconductivity
V. Z. Kresin,S. A. Wolf +1 more
TL;DR: In this paper, the main features of the electron-lattice interaction are discussed and high values of the critical temperature up to room temperature could be provided, while the issue of the mechanism of superconductivity in the high cuprates continues to be controversial.