Linear response theory for electron-hole pair kinetics: Exciton formation

被引：2
|
作者：
Ono, Shota [1 ,2 ]
机构：
[1] Yokohama Natl Univ, Grad Sch Engn, Dept Phys, Yokohama, Kanagawa 2408501, Japan
[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 12期
关键词：
TRANSIENT EXCITONS; EXCITATIONS; PARTICLE; METALS;
D O I：
10.1103/PhysRevB.92.125101
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A linear response theory for electron-hole pair density is developed, which constitutes a theoretical method, and a definition of exciton density in a first-principles context is derived by considering both the electron-hole attractive interaction and the screening effect. This allows the exciton time evolution to be examined. This formulation is applied to a jellium model in order to prove the existence of a transient exciton, and to observe crossover from a transient to a stable exciton in response to decreased electron density. The exciton formation mechanism is also revealed.
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页数：11
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