scholarly journals Polaron Dissociation at the Insulator-to-Metal Transition

1997 ◽  
Vol 11 (30) ◽  
pp. 1303-1312 ◽  
Author(s):  
P. Quémerais ◽  
S. Fratini
Keyword(s):  
Phase Diagram ◽  
Strong Coupling ◽  
Long Range ◽  
Liquid State ◽  
Large Mass ◽  
Critical Value ◽  
The Other ◽  
Phonon Coupling ◽  
Coulomb Interactions ◽  
Electron Phonon Coupling

Considering the long range Coulomb interactions between large polarons in dielectrics, we propose a model for their crystallization when no bipolarons are formed. As the density increases, the melting is examined at T=0 K. One possibility is the delocalization towards a liquid state of polarons. However, we show that this cannot happen if the electron-phonon coupling is larger than some critical value. The other competing mechanism is the dissociation of the polarons themselves, favored owing to their large mass at strong coupling. Finally, we propose a phase diagram for the insulator-to-metal transition as a function of the density and electron–phonon coupling.

Long-Range Electron-Phonon Coupling at Metal Surfaces

1984 ◽  
Vol 52 (23) ◽  
pp. 2073-2076 ◽  
Author(s):  
S. Andersson ◽  
B. N. J. Persson ◽  
M. Persson ◽  
N. D. Lang
Keyword(s):  
Long Range ◽  
Metal Surfaces ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Gutzwiller charge phase diagram of cuprates, including electron–phonon coupling effects

2015 ◽  
Vol 17 (2) ◽  
pp. 023074 ◽  
Author(s):  
R S Markiewicz ◽  
G Seibold ◽  
J Lorenzana ◽  
A Bansil
Keyword(s):  
Phase Diagram ◽  
Phonon Coupling ◽  
Coupling Effects ◽  
Electron Phonon Coupling

Stability of uniform electronic wavepackets in chains and fullerenes

2015 ◽  
Vol 26 (12) ◽  
pp. 1550133 ◽  
Author(s):  
Valdemir L. Chaves Filho ◽  
Rodrigo P. A. Lima ◽  
F. A. B. F. de Moura ◽  
Marcelo L. Lyra
Keyword(s):  
Dynamic Equation ◽  
Nonlinear Dynamic ◽  
Modulational Instability ◽  
The Other ◽  
Nonlinear Coupling ◽  
Phonon Coupling ◽  
Instability Analysis ◽  
Nonlinear Dynamic Equation ◽  
Electron Phonon Coupling ◽  
The Stability

In this paper, we investigate the influence of electron-lattice interaction on the stability of uniform electronic wavepackets on chains as well as on several types of fullerenes. We will use an effective nonlinear Schrödinger equation to mimic the electron–phonon coupling in these topologies. By numerically solving the nonlinear dynamic equation for an initially uniform electronic wavepacket, we show that the critical nonlinear coupling above which it becomes unstable continuously decreases with the chain size. On the other hand, the critical nonlinear strength saturates on a finite value in large fullerene buckyballs. We also provide analytical arguments to support these findings based on a modulational instability analysis.

scholarly journals MODIFIED TIGHT-BINDING APPROXIMATION AND ELECTRON-PHONON SPECTRAL FUNCTION FOR TRANSITION METALS

1990 ◽  
Vol 04 (07n08) ◽  
pp. 1395-1407 ◽  
Author(s):  
A.L. KUZEMSKY ◽  
A.P. ZHERNOV
Keyword(s):  
Transition Metals ◽  
Spectral Function ◽  
Strong Coupling ◽  
Coupling Parameter ◽  
Tight Binding ◽  
Numerical Calculations ◽  
Phonon Coupling ◽  
Tight Binding Approximation ◽  
Electron Phonon Coupling ◽  
Coupling Equations

The modified tight-binding approximation has been analyzed in detail and is applied to the derivation of an expression for electron-phonon spectral function (EPSF) which enters the strong coupling equations of superconductivity. Numerical calculations of the EPSF and the electron phonon coupling parameter λ for five transition metals, V, Nb, Mo, W, Ta have been performed.

scholarly journals Long-range transfer of electron–phonon coupling in oxide superlattices

2012 ◽  
Vol 11 (8) ◽  
pp. 675-681 ◽  
Author(s):  
N. Driza ◽  
S. Blanco-Canosa ◽  
M. Bakr ◽  
S. Soltan ◽  
M. Khalid ◽  
...  
Keyword(s):  
Long Range ◽  
Phonon Coupling ◽  
Electron Phonon Coupling

scholarly journals Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the HighTcCuprates

2010 ◽  
Vol 2010 ◽  
pp. 1-23 ◽  
Author(s):  
D. R. Garcia ◽  
A. Lanzara
Keyword(s):  
Phase Diagram ◽  
Phonon Dispersion ◽  
Nodal Point ◽  
Phonon Coupling ◽  
Spin Orbital ◽  
Angle Resolved Photoemission Spectroscopy ◽  
X Ray Scattering ◽  
Electron Phonon Coupling ◽  
New Perspective

With its central role in conventional BCS superconductivity, electron-phonon coupling appears to play a more subtle role in the phase diagram of the high-temperature superconducting cuprates. Their added complexity due to potentially numerous competing phases, including charge, spin, orbital, and lattice ordering, makes teasing out any unique phenomena challenging. In this review, we present our work using angle-resolved photoemission spectroscopy (ARPES) exploring the role of the lattice on the valence band electronic structure of the cuprates. We introduce the ARPES technique and its unique ability to the probe the effect of bosonic renormalization (or “kink”) on near-EFband structure. Our survey begins with the establishment of the ubiquitous nodal cuprate kink leading to how isotope substitution has shed a critical new perspective on the role and strength of electron-phonon coupling. We continue with recently published work connecting the phonon dispersion seen with inelastic X-ray scattering (IXS) to the location of the kink observed by ARPES near the nodal point. Finally, we present very recent and ongoing ARPES work examining how induced strain through chemical pressure provides a potentially promising avenue for understanding the broader role of the lattice to the superconducting phase and larger cuprate phase diagram.

scholarly journals Electron—phonon Coupling and the Superconducting Phase Diagram of the LaAlO3—SrTiO3 Interface

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Hans Boschker ◽  
Christoph Richter ◽  
Evangelos Fillis-Tsirakis ◽  
Christof W. Schneider ◽  
Jochen Mannhart
Keyword(s):  
Phase Diagram ◽  
Superconducting Phase ◽  
Phonon Coupling ◽  
Electron Phonon Coupling
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