Dynamical screening effects in hot-electron scattering from electron-hole plasma and LO-phonon modes in quantum wires
| Autor: | N C Constantinou, Bilal Tanatar, C.R. Bennett |
|---|---|
| Přispěvatelé: | Tanatar, Bilal |
| Rok vydání: | 1996 |
| Předmět: |
Relaxation
Phonon Relaxation processes Gaas Electronic density of states Electron Electron hole Energy conservation Hot electron scattering Photoexcited quasi one dimensional structure Electron transport properties Hot carriers Energy momentum conservation Emission Hot electron momentum relaxation Inelastic-scattering Materials Chemistry Electron energy levels Electron scattering Neutral plasma components Electron hole plasma Power loss Condensed matter physics Chemistry Quantum wire Approximation theory Random processes General Chemistry Plasma Condensed Matter Physics Semiconductor device structures Dynamical screening effects Plasmon phonon coupling Semiconductor quantum wires Density of states Phonons Relaxation (physics) Doped Polar Semiconductor Finite Temperature Random phase approximation |
| Zdroj: | Solid State Communications |
| ISSN: | 0038-1098 |
| DOI: | 10.1016/0038-1098(96)00266-9 |
| Popis: | Cataloged from PDF version of article. We present a fully dynamical and finite temperature study of the hot-electron momentum relaxation rate and the power loss in a coupled system of electron-hole plasma and bulk LO-phonons in a quantum wire structure. Interactions of the scattered electron with neutral plasma components and phonons are treated on an equal footing within the random-phase approximation. Coupled mode effects substantially change the transport properties of the system at low temperatures. Particularly, the ''plasmon-like'' and ''LO-phonon-like'' excitations yield comparable rates which, as a consequence of the singular nature of the 1D density of states, can be large at the threshold. This is in contrast to room temperature results where only the LO-phonon mode contributes significantly to the rate. The density and temperature dependence of the power loss reveals that dynamical screening effects are important, and energy-momentum conservation cannot be satisfied above a certain density for a given initial energy. Copyright (C) 1996 Elsevier Science Ltd |
| Databáze: | OpenAIRE |
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