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Exciton dephasing in quantum dots due to LO-phonon coupling: An exactly solvable model

被引：40
|
作者：
Muljarov, E. A.
Zimmermann, R.
机构：
[1] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[2] Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.98.187401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
It is widely believed that, due to its discrete nature, excitonic states in a quantum dot coupled to dispersionless longitudinal-optical (LO) phonons form everlasting mixed states (exciton polarons) showing no line broadening in the spectrum. This is indeed true if the model is restricted to a limited number of excitonic states in a quantum dot. We show, however, that extending the model to a large number of states results in LO phonon-induced spectral broadening and complete decoherence of the optical response.
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页数：4
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