Role of exchange interaction in Coulomb quantum kinetics

被引：13
|
作者：
Wolterink, T [1 ]
Axt, VM [1 ]
Kuhn, T [1 ]
机构：
[1] Univ Munster, Inst Festkorpertheorie, D-48149 Munster, Germany
来源：
PHYSICAL REVIEW B | 2003年 / 67卷 / 11期
关键词：
D O I：
10.1103/PhysRevB.67.115311
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In a quantum-kinetic approach based on density-matrix formulation we study the role of exchange interaction for ultrafast carrier relaxation. We find that the exchange contributions to scattering and screening tend to compensate each other. With very short times, however, due to the retarded buildup of the screening the exchange contribution to scattering prevails resulting in a reduced relaxation.
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页数：7
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