Dephasing in quantum dots: Quadratic coupling to acoustic phonons

被引:208
作者
Muljarov, EA
Zimmermann, R
机构
[1] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[2] Russian Acad Sci, Inst Gen Phys, Moscow 119991, Russia
基金
俄罗斯基础研究基金会;
关键词
D O I
10.1103/PhysRevLett.93.237401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A microscopic theory of optical transitions in quantum dots with a carrier-phonon interaction is developed. Virtual transitions into higher confined states with acoustic phonon assistance add a quadratic phonon coupling to the standard linear one, thus extending the independent boson model. Summing infinitely many diagrams in the cumulant, a numerically exact solution for the interband polarization is found. Its full time dependence and the absorption line shape of the quantum dot are calculated. It is the quadratic interaction which gives rise to a temperature-dependent broadening of the zero-phonon line, calculated here for the first time in a consistent scheme.
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页数:4
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