Uskov AV, Jauho A, Tromborg B, Mork J, Lang R
Lebedev Physical Institute, Leninsky prospekt 53, 117924 Moscow, Russia and Research Center COM, Technical University of Denmark, Building 349, DK-2800 Lyngby, Denmark and Department of Applied Physics, Tokyo University of Agriculture and T.
Phys Rev Lett. 2000 Aug 14;85(7):1516-9. doi: 10.1103/PhysRevLett.85.1516.
Interpretation of experiments on quantum dot (QD) lasers presents a challenge: the phonon bottleneck, which should strongly suppress relaxation and dephasing of the discrete energy states, often seems to be inoperative. We suggest and develop a theory for an intrinsic mechanism for dephasing in QDs: second-order elastic interaction between quantum dot charge carriers and LO phonons. The calculated dephasing times are of the order of 200 fs at room temperature, consistent with experiments. The phonon bottleneck thus does not prevent significant room temperature dephasing.
对量子点（QD）激光器实验结果的解读面临一项挑战：声子瓶颈效应本应强烈抑制离散能态的弛豫和退相，但它似乎常常不起作用。我们提出并发展了一种关于量子点中退相的内在机制的理论：量子点电荷载流子与纵光学（LO）声子之间的二阶弹性相互作用。计算得出的退相时间在室温下约为200飞秒，与实验结果相符。因此，声子瓶颈效应并不能阻止室温下显著的退相现象。
