Probing Electron-Phonon Interaction through Two-Photon Interference in Resonantly Driven Semiconductor Quantum Dots.
Probing Electron-Phonon Interaction through Two-Photon Interference in Resonantly Driven Semiconductor Quantum Dots.
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通过谐振驱动半导体量子点中的双光子干涉探测电子-声子相互作用。
DOI：
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发表时间：
2016
影响因子：
8.6
通讯作者：
V. Voliotis
中科院分区：
文献类型：
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作者：
A. Reigue;Jake Iles;F. Lux;L. Monniello;M. Bernard;F. Margaillan;A. Lemaître;Anthony Martinez;D. McCutcheon;J. Mørk;R. Hostein;V. Voliotis
通过对单量子点在共振激发下的双光子干涉测量，研究了光子相干特性的温度依赖性。我们发现，不可逆性的损失只与电子-声子耦合，而不受光谱扩散。通过这些测量和互补的微观理论，我们确定了两个独立的单独的退相干过程，这两个过程都与声子。低于10 K时，我们发现振动晶格的弛豫是TPI可见性损失的主要贡献。这个过程本质上是非马尔可夫的，对应于真实的声子跃迁，导致量子点发射光谱中的宽声子边带。在10 K以上，虚声子跃迁到量子点的高激发态成为主要的退相机制，这导致零声子线加宽，可见度相应地迅速衰减。我们发展的微观理论为虚声子散射和非马尔可夫晶格弛豫的退相速率提供了解析表达式。
We investigate the temperature dependence of photon coherence properties through two-photon interference (TPI) measurements from a single quantum dot (QD) under resonant excitation. We show that the loss of indistinguishability is related only to the electron-phonon coupling and is not affected by spectral diffusion. Through these measurements and a complementary microscopic theory, we identify two independent separate decoherence processes, both of which are associated with phonons. Below 10 K, we find that the relaxation of the vibrational lattice is the dominant contribution to the loss of TPI visibility. This process is non-Markovian in nature and corresponds to real phonon transitions resulting in a broad phonon sideband in the QD emission spectra. Above 10 K, virtual phonon transitions to higher lying excited states in the QD become the dominant dephasing mechanism, this leads to a broadening of the zero phonon line, and a corresponding rapid decay in the visibility. The microscopic theory we develop provides analytic expressions for the dephasing rates for both virtual phonon scattering and non-Markovian lattice relaxation.