Long-time dynamics and stationary nonequilibrium of an optically driven strongly confined quantum dot coupled to phonons
Long-time dynamics and stationary nonequilibrium of an optically driven strongly confined quantum dot coupled to phonons
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DOI：
10.1103/physrevb.84.195311
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发表时间：
2011-11-08
影响因子：
3.7
通讯作者：
Kuhn, T.
中科院分区：
文献类型：
--
作者：
Glaessl, M.;Vagov, A.;Kuhn, T.
我们使用精确的实时路径积分和四阶相关展开研究了与声子耦合的光驱动量子点的长时间动力学和稳态非平衡态。通过探索宽范围的温度，载流子-声子和载流子-光耦合强度，我们表征了平稳非平衡状态，并将精确解与已知的近似推导结果进行了比较。分析计算往往高估了载流子-声子耦合的影响，特别是在低温和弱耦合状态下。讨论了通过改变激光失谐来控制稳态非平衡中点占比的可能性。通过对两种数值方法的比较，确定了相关展开式的有效范围，在长时间限制下，其有效范围惊人地宽。
We study the long-time dynamics and the stationary nonequilibrium state of an optically driven quantum dot coupled to acoustic phonons using numerically exact real-time path integrals and a fourth-order correlation expansion. By exploring wide ranges of temperatures, carrier-phonon and carrier-light coupling strengths, we characterize the stationary nonequilibrium state and compare the exact solution to known, approximatively derived results. It is found that analytical calculations tend to overestimate the influence of the carrier-phonon coupling, particularly at low temperatures and in the weak-coupling regime. The possibility of controlling the dot occupation in the stationary nonequilibrium by varying the laser detuning is discussed. A comparison between the numerical methods identifies the range of validity of the correlation expansion, which in the long-time limit is found to be surprisingly wide.