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首页> 外文期刊>Journal of Experimental and Theoretical Physics >X-shaped and Y-shaped Andreev resonance profiles in a superconducting quantum dot
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X-shaped and Y-shaped Andreev resonance profiles in a superconducting quantum dot

机译:超导量子点中的X形和Y形Andreev共振分布

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摘要

The quasi-bound states of a superconducting quantum dot that is weakly coupled to a normal metal appear as resonances in the Andreev reflection probability, measured via the differential conductance. We study the evolution of these Andreev resonances when an external parameter (such as the magnetic field or gate voltage) is varied, using a random-matrix model for the N x N scattering matrix. We contrast the two ensembles with broken time-reversal symmetry, in the presence or absence of spin-rotation symmetry (class C or D). The poles of the scattering matrix in the complex plane, encoding the center and width of the resonance, are repelled from the imaginary axis in class C. In class D, in contrast, a number ae aeN of the poles has zero real part. The corresponding Andreev resonances are pinned to the middle of the gap and produce a zero-bias conductance peak that does not split over a range of parameter values (Y-shaped profile), unlike the usual conductance peaks that merge and then immediately split (X-shaped profile).
机译:弱耦合到正常金属的超导量子点的准束缚状态以安德列夫反射概率的共振形式出现,通过差分电导测量。我们使用N x N散射矩阵的随机矩阵模型研究了外部参数(例如磁场或栅极电压)变化时这些Andreev共振的演化。在存在或不存在自旋旋转对称性(C或D类)的情况下,我们对比了两个具有破碎的时间反转对称性的合奏。复杂平面中的散射矩阵的极点,编码共振的中心和宽度,是从C类的假想轴击退的。相反,在D类中,极点数aeN的极点的实部为零。相应的Andreev共振被固定在间隙的中间,并产生零偏置电导峰,该峰不会在一系列参数值(Y形轮廓)上分裂,而不同于通常的电导峰会合并然后立即分裂(X形轮廓)。

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