skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Resonance enhancement of electron-phonon interaction in nanostructures

Abstract

The theory of electron-phonon interaction in quantum well is developed taking into account the influence of interface optical phonons. A detailed analysis of the dependence of polaron effective mass on the quantum well size and dielectric characteristics of barrier material is performed. It is shown that quasi-two-dimensional polaron may arise in narrow quantum wells. However, the interaction parameters are determined by effective mass of carriers in the quantum well and interface optical phonons frequencies. If the barriers are made of non-polar material, the polaron effective mass depends on the quantum well width. By increasing the quantum well width, a new mechanism of amplification of the electron-phonon interaction is realized. It occurs in the case of coincidence of the optical phonon energy with the energy of one of the electronic transitions. This leads to a nonmonotonic dependence of polaron effective mass on the quantum well width.

Authors:
;  [1]
  1. Ioffe Physical-Technical Institute of the Russian Academy of Sciences, Polytekhnicheskaya 26, Saint Petersburg 194021 (Russian Federation)
Publication Date:
OSTI Identifier:
22261796
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1566; Journal Issue: 1; Conference: ICPS 2012: 31. international conference on the physics of semiconductors, Zurich (Switzerland), 29 Jul - 3 Aug 2012; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; EFFECTIVE MASS; ELECTRON-PHONON COUPLING; INTERACTIONS; PHONONS; QUANTUM WELLS

Citation Formats

Maslov, A. Yu., and Proshina, O. V. Resonance enhancement of electron-phonon interaction in nanostructures. United States: N. p., 2013. Web. doi:10.1063/1.4848370.
Maslov, A. Yu., & Proshina, O. V. Resonance enhancement of electron-phonon interaction in nanostructures. United States. doi:10.1063/1.4848370.
Maslov, A. Yu., and Proshina, O. V. Wed . "Resonance enhancement of electron-phonon interaction in nanostructures". United States. doi:10.1063/1.4848370.
@article{osti_22261796,
title = {Resonance enhancement of electron-phonon interaction in nanostructures},
author = {Maslov, A. Yu. and Proshina, O. V.},
abstractNote = {The theory of electron-phonon interaction in quantum well is developed taking into account the influence of interface optical phonons. A detailed analysis of the dependence of polaron effective mass on the quantum well size and dielectric characteristics of barrier material is performed. It is shown that quasi-two-dimensional polaron may arise in narrow quantum wells. However, the interaction parameters are determined by effective mass of carriers in the quantum well and interface optical phonons frequencies. If the barriers are made of non-polar material, the polaron effective mass depends on the quantum well width. By increasing the quantum well width, a new mechanism of amplification of the electron-phonon interaction is realized. It occurs in the case of coincidence of the optical phonon energy with the energy of one of the electronic transitions. This leads to a nonmonotonic dependence of polaron effective mass on the quantum well width.},
doi = {10.1063/1.4848370},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1566,
place = {United States},
year = {Wed Dec 04 00:00:00 EST 2013},
month = {Wed Dec 04 00:00:00 EST 2013}
}
  • The phonon-electron interaction in polar crystals gives rise to the nonlinear dependence of the cyclotron resonance frequency on the magnetic field. The calculation of this term shows that it is small for pnactically used fields. The polaron effect leads also to a correction in diamagnetic susceptibility. The mass renormalization in the presence of the magnetic field is performed without assuming the coupling constant to be small. (auth)
  • The theory of electron-phonon interaction shifting of the cyclotron and thermal masses is extended to include a d-c magnetic field in Frohlich's Hamiltonian, obtaining the h-f conductivity. Landau's theory of Fermi liquids was applied to see the effect of the Coulomb interaction of electrons. (R.E.U.)
  • Azbel-Kaner cyclotron resonance experiments were carried out for mercury, a strong-coupling superconductor at 35 GHz in the range 1.1 to 2.5 K for 2 orbits. The effective cyclotron mass was found to vary as the square of the temperature, consistent with the predictions of electron-phonon interaction theory. The relative mass increments differ for the two orbits studied, indicating anisotropy in the phonon spectrum. The electronic relaxation times for the two orbits decreased rapidly with increasing temperature and were found to vary inversely as T/sup 5.2 +- 0.3/. This result is not in agreement with the simple theory which predicts variationmore » with T/sup 3/. 22 references.« less
  • Neutron resonance spin-echo spectroscopy was used to monitor the temperature evolution of the linewidths of transverse acoustic phonons in lead across the superconducting transition temperature T{sub c} over an extended range of the Brillouin zone. For phonons with energies below the superconducting energy gap, a linewidth reduction of maximum amplitude {approx}6 {mu}eV was observed below T{sub c}. The electron-phonon contribution to the phonon lifetime extracted from these data is in satisfactory overall agreement with ab initio lattice-dynamical calculations, but significant deviations are found.
  • The electron transport through ultra-scaled amorphous phase change material (PCM) GeTe is investigated by using ab initio molecular dynamics, density functional theory, and non-equilibrium Green’s function, and the inelastic electron–phonon scattering is accounted for by using the Born approximation. It is shown that, in ultra-scaled PCM device with 6 nm channel length, < 4 % of the energy carried by the incident electrons from the source is transferred to the atomic lattice before reaching the drain, indicating that the electron transport is largely elastic. Our simulation results show that the inelastic electron–phonon scattering, which plays an important role to excitemore » trapped electrons in bulk PCM devices, exerts very limited influence on the current density value and the shape of current–voltage curve of ultra-scaled PCM devices. The analysis reveals that the Poole–Frenkel law and the Ohm’s law, which are the governing physical mechanisms of the bulk PCM devices, cease to be valid in the ultra-scaled PCM devices.« less