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首页> 外文期刊>Physical review >Electron tunneling through a hybrid superconducting-normal mesoscopic junction under microwave radiation
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Electron tunneling through a hybrid superconducting-normal mesoscopic junction under microwave radiation

机译：微波辐射下通过杂化超导-正常介观结的电子隧穿

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摘要

We present a theoretical analysis for electron tunneling through a hybrid superconducting-normal mesoscopic junction consisting of a superconducting electrode, a two-level quantum dot, and a normal electrode under single mode microwave radiation. Using nonequilibrium Green's-function formalism, we incorporate Roquet basis in the Nambu space and solve the Green's function with finite matrix truncation to obtain the transport properties numerically. We studied the effects of photon-induced single-level oscillations and quantum transition between levels on the time-averaged current-voltage (I-V) characteristics of the system. For quantum dot with a single localized level, the main dc resonance remains unchanged regardless of the frequency and amplitude of the radiation, and a series of secondary resonances due to multiphoton processes are present. For quantum dot with two localized levels, the sole effects from the transitions between levels produce splitting on the main dc resonance at Rabi frequency proportional to the coupling. This provides the possibility for experimental inference of the interlevel coupling strength of the driven resonant tunneling system from the bias voltage energy difference between the split resonances in the I-V curve.
机译：我们提出了一种在单模微波辐射下通过混合超导-常规介观结的电子隧穿的理论分析，该超导-常规介观结由超导电极，两级量子点和常规电极组成。使用非平衡格林函数形式，我们将Roquet基合并到Nambu空间中，并用有限矩阵截断法来求解格林函数，以数值方式获得运输性质。我们研究了光子诱导的单能级振荡和能级之间的量子跃迁对系统时间平均电流-电压（I-V）特性的影响。对于具有单个局部能级的量子点，无论辐射的频率和幅度如何，主直流谐振均保持不变，并且由于多光子过程而存在一系列次级谐振。对于具有两个局部能级的量子点，在能级之间的跃迁产生的唯一影响是在与耦合成比例的拉比频率下，主直流谐振产生分裂。这为根据I-V曲线中分裂谐振之间的偏置电压能量差，通过实验推断出驱动谐振隧道系统的层间耦合强度提供了可能性。

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