Classical polarons in a constant electric field -: art. no. 245203

被引：3
|
作者：
Meinert, G
Bányai, L
Gartner, P
机构：
[1] Univ Frankfurt, Inst Theoret Phys, D-60054 Frankfurt, Germany
[2] Natl Inst Phys Mat, Bucharest, Romania
来源：
PHYSICAL REVIEW B | 2001年 / 63卷 / 24期
关键词：
D O I：
10.1103/PhysRevB.63.245203
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A classical model of electrons interacting with a longitudinal optical (LO) continuum phonon field via the Frohlich coupling is studied. Simulating a spatially homogeneous excitation by initially,distributing the electrons on a lattice, the solution of the many-body problem reduces to the evaluation of one nonlocal integro-differential (vector) equation, which can be solved numerically. According to the two parameters governing the behavior-electric field and coupling constant-two different regimes can be distinguished, a diffusive and a ballistic one. In the critical range of transition from one regime to the other the influence of the electron density becomes crucial. It is shown that the electrons-via the interaction with the phonon field-emit radiation in the terahertz range around the LO-phonon frequency.
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页数：8
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