Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
Temperature dependence of Andreev spectra in a superconducting carbon nanotube quantum dot
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DOI：
10.1103/physrevb.89.075428
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发表时间：
2014-02-24
影响因子：
3.7
通讯作者：
Strunk, C.
中科院分区：
文献类型：
--
作者：
Kumar, A.;Gaim, M.;Strunk, C.
铌耦合碳纳米管量子点的隧穿光谱揭示了超导隙内安德烈夫束缚态（ABS）对的形成。发现了下ABS的弱复制品，这是由准粒子从ABS隧穿到Al隧道探针产生的。在高温下观察到ABS弥散的反转，这表明ABS上部的热占据。我们的实验结果得到了基于超导Anderson模型的模型计算的很好的支持。
Tunneling spectroscopy of a Nb coupled carbon nanotube quantum dot reveals the formation of pairs of Andreev bound states (ABS) within the superconducting gap. A weak replica of the lower ABS is found, which is generated by quasiparticle tunneling from the ABS to the Al tunnel probe. An inversion of the ABS dispersion is observed at elevated temperatures, which signals the thermal occupation of the upper ABS. Our experimental findings are well supported by model calculations based on the superconducting Anderson model.