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Steady‐State Density of States for Electrons in Terahertz‐Driven One‐Dimensional Electron Gases
Author(s) -
Xu W.
Publication year - 1998
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199802)205:2<559::aid-pssb559>3.0.co;2-2
Subject(s) - electron , terahertz radiation , physics , photon , atomic physics , absorption (acoustics) , electron density , free electron model , fermi gas , optics , quantum mechanics
A detailed theoretical study of the density of states (DOS) is presented for free electrons in one‐dimensional electron gases (1DEGs), subject to terahertz (THz) electromagnetic (EM) fields polarised linearly. Applying the solution of time‐dependent Schrödinger equation in a specific sample configuration, where electron interactions with the radiation field can be included exactly, I have derived the two‐time Green's function, and from it the steady‐state DOS for a THz‐driven 1DEG is obtained. The results show that the presence of the intense THz EM radiations will result in a strong modulation of the DOS for electrons in 1DEGs. It has been found that the optical processes via photon emission and absorption, including the multiphoton channels, will affect significantly the electron DOS in a 1DEG system.