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Polaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach

机译:由于平均场方法中的非谐耦合,量子点中的极化子弛豫

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We study the electronic relaxation in a quantum dot within the polaron approach by focusing on the reversible anharmonic decay of longitudinal optical (LO) phonons forming the polaron into longitudinal-acoustic (LA) phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach. We derive a temperature-dependent interlevel coupling parameter, related to the Grueneisen parameter and the thermal-expansion coefficient, which characterizes an effective decay channel for the electronic (or excitonic) states. Within this theory, we obtain a characteristic anharmonic decay time of 1 ns, 2-3 orders of magnitude longer than previous predictions based on the Fermi's Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay.
机译:我们通过关注纵向光学(LO)声子的可逆非谐衰变,将极化子转变为纵向声(LA)声子,研究了极化子方法中量子点中的电子弛豫。 LO和LA声子之间的相干耦合以均场方法处理。我们推导了与温度相关的层间耦合参数,该参数与Grueneisen参数和热膨胀系数有关,该参数表征了电子(或激子)态的有效衰减通道。在此理论下,我们获得了1 ns的特征非谐衰减时间,比以前基于费米黄金定律的预测长了2-3个数量级。我们建议,由于载流子-载流子相互作用而引起的相干弛豫是(太慢的)极化子衰变的有效替代方法。

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