arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.09803cond-mat.mes-hallcond-mat.supr-con
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邻近超导体中的热模激发

Heat-mode excitation in a proximity superconductor

A. O. Denisov, A. V. Bubis, S. U. Piatrusha, N. A. Titova, A. G. Nasibulin, J. Becker, J. Treu, D. Ruhstorfer, G. Koblmueller, E. S. Tikhonov, V. S. Khrapai

摘要:

介观超导处理各种准粒子激发模式,其中只有一种-电荷模式-由于准电子和准空穴激发分支的不平衡,可直接用于电导测量。其他携带热量甚至自旋、谷值等电流的模式同样占据分支,并且是电荷中性的,这使得它们更难控制。介观非平衡超导实验研究中的这一显著空白可以通过超越传统的直流输运测量和利用自发电流涨落来填补。在这里,我们进行这样的实验,并研究在一个开放的混合设备的基础上超导体接近InAs纳米线的热传输。使用散粒噪声测量,我们调查子间隙Andreev沿超导界面的热引导和充分表征它的热导的顺序为$G_\mathrm{th}\sim e^2/h$,可调的背栅电压。对热模的理解也揭示了它在非局域电荷输运中的隐含特征。我们的实验开辟了一条直接的途径,探测通用的电荷中性的超导混合物的激发。

英文摘要:

Mesoscopic superconductivity deals with various quasiparticle excitation modes, only one of them -- the charge-mode -- being directly accessible for conductance measurements due to the imbalance in populations of quasi-electron and quasihole excitation branches. Other modes carrying heat or even spin, valley etc. currents populate the branches equally and are charge-neutral, which makes them much harder to control. This noticeable gap in the experimental studies of mesoscopic non-equilibrium superconductivity can be filled by going beyond the conventional DC transport measurements and exploiting spontaneous current fluctuations. Here, we perform such an experiment and investigate the transport of heat in an open hybrid device based on a superconductor proximitized InAs nanowire. Using shot noise measurements, we investigate sub-gap Andreev heat guiding along the superconducting interface and fully characterize it in terms of the thermal conductance on the order of $G_\mathrm{th}\sim e^2/h$, tunable by a back gate voltage. Understanding of the heat-mode also uncovers its implicit signatures in the non-local charge transport. Our experiments open a direct pathway to probe generic charge-neutral excitations in superconducting hybrids.

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