Two-time electron-LO-phonon quantum kinetics and the generalized Kadanoff-Baym approximation

被引：46

作者：

Gartner, P ^{[1
]}

Bányai, L

Haug, H

机构：

[1] Natl Inst Phys Mat, Bucharest, Romania

[2] Goethe Univ Frankfurt, Inst Theoret Phys, D-6000 Frankfurt, Germany

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.60.14234

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We solve numerically the time-dependent self-consistent random phase approximation Dyson equations for a system of electrons and holes of a direct gap semiconductor excited by an ultrashort laser pulse interacting with LO phonons in equilibrium. Special care is devoted to the proper treatment of the prehistory of the system by including the polaron effects. We show that for weak Frohlich coupling (alpha=0.1), the generalized Kadanoff-Baym relationship, which enables a one-time formulation, is excellently verified while for intermediate coupling(alpha=1) the deviations become important. [S0163-1829(99)03943-0].

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页码：14234 / 14241

页数：8

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