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arXiv 0802.3269cond-mat.supr-concond-mat.mes-hall
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超导体/铁磁体量子点接触的电导和电流噪声

Conductance and current noise of a superconductor/ferromagnet quantum point contact

Audrey Cottet, Wolfgang Belzig

摘要:

利用散射方法研究了超导/铁磁单沟道量子点接触(QPC)的电导和电流噪声随QPC偏压的变化关系。我们表明,自旋依赖性的界面相移(SDIPS)获得的电子散射后,由QPC可以强烈修改这些信号。对于弱透明的接触,SDIPS诱导的QPC的电导和微分Fano因子曲线中的子间隙共振。对于高分辨率,这些共振被平滑,但信号的形状对SDIPS仍然非常敏感。我们表明,噪声测量可以帮助获得更多的设备上的信息,例如,在SDIPS修改定性的差分Fano因子的QPC,但不是电导的情况下。

英文摘要:

We study the conductance and current noise of a superconductor/ferromagnet (S/F) single channel Quantum Point Contact (QPC) as a function of the QPC bias voltage, using a scattering approach. We show that the Spin-Dependence of Interfacial Phase Shifts (SDIPS) acquired by electrons upon scattering by the QPC can strongly modify these signals. For a weakly transparent contact, the SDIPS induces sub-gap resonances in the conductance and differential Fano factor curves of the QPC. For high transparencies, these resonances are smoothed, but the shape of the signals remain extremely sensitive to the SDIPS. We show that noise measurements could help to gain more information on the device, e.g. in cases where the SDIPS modifies qualitatively the differential Fano factor of the QPC but not the conductance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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