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Title: Electron-phonon interaction in three-barrier nanosystems as active elements of quantum cascade detectors

The theory of electron tunneling through an open nanostructure as an active element of a quantum cascade detector is developed, which takes into account the interaction of electrons with confined and interface phonons. Using the method of finite-temperature Green’s functions and the electron-phonon Hamiltonian in the representation of second quantization over all system variables, the temperature shifts and electron-level widths are calculated and the contributions of different electron-phonon-interaction mechanisms to renormalization of the spectral parameters are analyzed depending on the geometrical configuration of the nanosystem. Due to weak electron-phonon coupling in a GaAs/Al{sub 0.34}Ga{sub 0.66}As-based resonant tunneling nanostructure, the temperature shift and rf field absorption peak width are not very sensitive to the electron-phonon interaction and result from a decrease in potential barrier heights caused by a difference in the temperature dependences of the well and barrier band gaps.
Authors:
; ;  [1]
  1. Chernivtsy National University (Ukraine)
Publication Date:
OSTI Identifier:
22469978
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 49; Journal Issue: 4; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ALUMINIUM COMPOUNDS; ELECTRON-PHONON COUPLING; ELECTRONS; ENERGY GAP; GALLIUM ARSENIDES; GREEN FUNCTION; HAMILTONIANS; INTERFACES; LEVEL WIDTHS; NANOSTRUCTURES; PHONONS; RENORMALIZATION; SECOND QUANTIZATION; TEMPERATURE DEPENDENCE; TUNNEL EFFECT