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首页> 外文期刊>Physical review >Cavity-coupled double-quantum dot at finite bias: Analogy with lasers and beyond
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Cavity-coupled double-quantum dot at finite bias: Analogy with lasers and beyond

机译：有限偏置下的腔耦合双量子点：与激光等类似物

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摘要

We present a theoretical and experimental study of photonic and electronic transport properties of a voltage biased InAs semiconductor double quantum dot (DQD) that is dipole coupled to a superconducting transmission line resonator. We obtain the master equation for the reduced density matrix of the coupled system of cavity photons and DQD electrons accounting systematically for both the presence of phonons and the effect of leads at finite voltage bias. We subsequently derive analytical expressions for transmission, phase response, photon number, and the nonequilibrium steady-state electron current. We show that the coupled system under finite bias realizes an unconventional version of a single-atom laser and analyze the spectrum and the statistics of the photon flux leaving the cavity. In the transmission mode, the system behaves as a saturable single-atom amplifier for the incoming photon flux. Finally, we show that the back action of the photon emission on the steady-state current can be substantial. Our analytical results are compared to exact master equation results establishing regimes of validity of various analytical models. We compare our findings to available experimental measurements.
机译：我们提出了一个偶极耦合到超导传输线谐振器的电压偏置InAs半导体双量子点（DQD）的光子和电子传输特性的理论和实验研究。我们系统地考虑了声子的存在和有限电压偏置下铅的影响，获得了腔光子与DQD电子耦合系统的密度降低矩阵的主方程。随后，我们得出透射，相位响应，光子数和非平衡稳态电子电流的解析表达式。我们表明，在有限偏置下的耦合系统实现了单原子激光器的非常规版本，并分析了离开腔的光子通量的光谱和统计数据。在传输模式下，该系统充当用于入射光子通量的可饱和单原子放大器。最后，我们证明了光子发射对稳态电流的反作用可能很大。我们的分析结果将与精确的主方程结果进行比较，从而确定各种分析模型的有效性。我们将我们的发现与可用的实验测量结果进行比较。

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