DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Building 345, 2800 Kgs. Lyngby, Denmark.
Phys Rev Lett. 2010 Apr 16;104(15):157401. doi: 10.1103/PhysRevLett.104.157401. Epub 2010 Apr 13.
We investigate the influence of electron-phonon interactions on the dynamical properties of a quantum-dot-cavity QED system. We show that non-markovian effects in the phonon reservoir lead to strong changes in the dynamics, arising from photon-assisted dephasing processes, not present in markovian treatments. A pronounced consequence is the emergence of a phonon induced spectral asymmetry when detuning the cavity from the quantum-dot resonance. The asymmetry can only be explained when considering the polaritonic quasiparticle nature of the quantum-dot-cavity system. Furthermore, a temperature induced reduction of the light-matter coupling strength is found to be relevant in interpreting experimental data, especially in the strong coupling regime.
我们研究了电子-声子相互作用对量子点-腔 QED 系统动力学性质的影响。我们表明，声子库中的非马尔可夫效应导致了动力学的强烈变化，这是马尔可夫处理中所没有的，这些变化源于光子辅助退相位过程。一个显著的结果是，当腔从量子点共振失谐时，出现了声子诱导的谱不对称。只有考虑到量子点-腔系统的极化激元准粒子性质，才能解释这种不对称性。此外，我们发现温度引起的光-物质耦合强度的降低在解释实验数据时是相关的，特别是在强耦合 regime 中。
