Dephasing times in quantum dots due to elastic LO phonon-carrier collisions
Dephasing times in quantum dots due to elastic LO phonon-carrier collisions
复制标题
由于弹性 LO 声子-载流子碰撞导致量子点中的相移时间
作者：
Alexander V. Uskov;A. Jauho;B. Tromborg;Jesper Mørk;R. Lang
对量子点 (QD) 激光器实验的解释提出了一个挑战：声子瓶颈本应强烈抑制离散能态的弛豫和相移，但通常似乎不起作用。我们提出并发展了一种关于量子点相移的内在机制的理论：量子点载流子和 LO 声子之间的二阶弹性相互作用。计算得出的相移时间在室温下约为 200 fs，与实验一致。因此，声子瓶颈不会阻止显着的室温失相。
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.