Electron–phonon interaction in atomic-scale conductors: Einstein oscillators versus full phonon modes

2003 ◽  
Vol 15 (50) ◽  
pp. 8781-8795 ◽  
Author(s):  
M J Montgomery ◽  
T N Todorov
Keyword(s):  
Atomic Scale ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

scholarly journals Многократное изменение электрон-фононного взаимодействия в квантовых ямах с диэлектрически различными барьерами

2022 ◽  
Vol 56 (1) ◽  
pp. 101
Author(s):  
А.Ю. Маслов ◽  
О.В. Прошина
Keyword(s):  
Quantum Wells ◽  
Charged Particles ◽  
Strong Interactions ◽  
Asymmetric Structure ◽  
Optical Phonons ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
Barrier Materials ◽  
Electron Phonon Interaction ◽  
Order Of Magnitude

Abstract The specific features of the interaction of charged particles with polar optical phonons have been studied theoretically for quantum wells with the barriers that are asymmetric in their dielectric properties. It is shown that the interaction with interface phonon modes makes the greatest contribution in narrow quantum wells. The parameters of the electron-phonon interaction were found for the cases of different values of the phonon frequencies in the barrier materials. It turned out that a significant (by almost an order of magnitude) change in the parameters of the electron-phonon interaction can occur in such structures. This makes it possible, in principle, to trace the transition from weak to strong interactions in quantum wells of the same type but with different compositions of barrier materials. The conditions are found under which an enhancement of the electron-phonon interaction is possible in an asymmetric structure in comparison with a symmetric one with the barriers of the same composition.

ELECTRON-PHONON INTERACTION AND SUPERCONDUCTIVITY IN OXIDE SUPERCONDUCTORS La2−xSrxCuO4

1993 ◽  
Vol 07 (01n03) ◽  
pp. 182-185
Author(s):  
M. SHIRAI ◽  
T. KINOSHITA ◽  
K. MOTIZUKI
Keyword(s):  
Tight Binding ◽  
Wide Energy Range ◽  
Oxide Superconductors ◽  
Tunneling Conductance ◽  
Eliashberg Equations ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
Characteristic Structure ◽  
Electron Phonon Interaction ◽  
Wide Energy

Effects of electron-phonon interaction on lattice dynamics in oxide superconductors La 2−x Sr x CuO 4 (LSC) are studied microscopically on the basis of the tight-binding band fitted to the first principle band. Breathing-type vibrations of oxygen atoms in the CuO 2 plane are renormalized significantly at around (π/a, π/a, 0) and (π/a, 0, 0) due to strong dependences of the electron-phonon interaction on wavevectors and phonon modes. In the framework of the usual phonon-mediated pairing mechanism, superconducting properties, such as transition temperatures and tunneling spectra, are studied by solving isotropic Eliashberg equations. The spectral function α2F(ω) has a characteristic structure over a wide energy range below 85 meV. The tunneling conductance d I/ d V and its derivative d 2I/ d V2 calculated have prominent peaks below 40 meV, which show good correspondences to those observed by recent tunneling experiments.

Resolving Voltage–Time Dilemma Using an Atomic-Scale Lever of Subpicosecond Electron–Phonon Interaction

Nano Letters ◽  
2014 ◽  
Vol 14 (9) ◽  
pp. 5058-5067 ◽  
Author(s):  
Xiang Yang ◽  
Ioan Tudosa ◽  
Byung Joon Choi ◽  
Albert B. K. Chen ◽  
I-Wei Chen
Keyword(s):  
Atomic Scale ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

Optical-phonon modes and electron-phonon interaction in arbitrary semiconductor planar microcavities

1999 ◽  
Vol 60 (23) ◽  
pp. 16031-16038 ◽  
Author(s):  
Jun-jie Shi ◽  
B. C. Sanders ◽  
Shao-hua Pan ◽  
E. M. Goldys
Keyword(s):  
Optical Phonon ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
Electron Phonon Interaction

Electron-Phonon Interaction in a Multi-Shell Spherical Nanoheterosystem

2003 ◽  
Vol 17 (20n21) ◽  
pp. 1081-1094
Author(s):  
Li Zhang ◽  
Hong-Jing Xie ◽  
Chuan-Yu Chen
Keyword(s):  
Longitudinal Optical ◽  
Core Region ◽  
Continuum Approximation ◽  
Phonon Modes ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
The Core ◽  
Dielectric Continuum ◽  
Shell Region

Under the dielectric continuum approximation, the confined longitudinal-optical (LO) phonon and interface-optical (IO) phonon modes of a multi-shell spherical nanoheterosystem are discussed. To describe the vibrations of the LO phonons, a proper eigenfunction for LO phonon modes in the core region is adopted and a legitimate eigenfunction for LO modes in the shell region is constructed. To deal with the IO phonon modes, determinant methods are employed, and the determinant deciding the frequencies of IO phonon modes are obtained. The quantized LO and IO phonons fields as well as their corresponding electron-phonon interaction Hamiltonians are also derived.

Phonon Bottleneck Effect in Organic Molecules

2009 ◽  
Vol 1172 ◽  
Author(s):  
S. Bandyopadhyay ◽  
Bhargava Kanchibotla
Keyword(s):  
Spin Relaxation ◽  
Organic Molecules ◽  
Transverse Spin ◽  
Phonon Modes ◽  
Temperature Dependent ◽  
Phonon Interaction ◽  
Bottleneck Effect ◽  
Electron Phonon Interaction ◽  
Phonon Bottleneck ◽  
Dimension 2

AbstractWe have measured the ensemble averaged transverse spin relaxation time T2* (associated with g = 4 resonance) in bulk powders of the organic molecule Alq3, and in samples containing 1-2 molecules confined in nanocavities of dimension ˜ 2 nm. Both T2* times are strongly temperature dependent indicating that they are determined by phonon-mediated spin relaxation. Interestingly, the T2* time in nanocavities is ˜2.5 times longer than in bulk powder over a wide temperature range. The longer T2* in the nanocavity is evidence of weakened electron-phonon interaction. We believe that electron-phonon interaction is suppressed because the cavity confines phonons and discretizes the phonon modes and phonon energies. As a result, the chances of a phonon induced (inelastic) spin relaxation event are reduced owing to the need to conserve energy in the relaxation process. This is a novel “phonon bottleneck effect” that to our knowledge has not been previously reported.

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