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arXiv 2602.07332cond-mat.mes-hall
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Majorana和Andreev束缚态的多余光子辅助噪声

Excess photon-assisted noise of Majorana and Andreev bound states

Beijing Academy of Quantum Information Sciences(北京量子信息科学研究院);Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(中国科学院物理研究所凝聚态物理国家实验室);University of Chinese Academy of Sciences(中国科学院大学);State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University(清华大学物理系低维量子物理国家重点实验室);Frontier Science Center for Quantum Information(量子信息前沿科学中心);Hefei National Laboratory(合肥国家实验室)

Qiang Lin, Ying-Xin Liang, Ke He, Zhan Cao

AI总结:

研究Majorana和Andreev束缚态中光子辅助噪声的特性,揭示其在不同偏压下的行为差异。

摘要:

光子辅助隧道效应在交流偏压下出现,驱动频率决定了光子能量。多余的光子辅助噪声被定义为在综合直流和交流偏压下的射频噪声与仅直流偏压下的射频噪声之差。我们研究了在Majorana或Andreev束缚态中隧道效应的这一量值,这些束缚态在寻找拓扑超导体中具有重要地位。在谐波偏压$V(t)=V_\mathrm{dc}[1-\cos(Ωt)]$下,多余的光子辅助噪声表现出不同的行为:对于Majorana或准Majorana束缚态,随着$V_\mathrm{dc}$增加,其符号多次反转,并在非零整数倍的$eV_\mathrm{dc}/Ω$(其中$e$为基本电荷)处消失;而对于零能Andreev束缚态--特别是那些产生近量子化的零偏导电峰的束缚态--其在整个$V_\mathrm{dc}$范围内始终保持严格负值。

英文摘要:

Photon-assisted tunneling arises under an ac bias, with the drive frequency setting the photon energy. The excess photon-assisted noise is defined as the difference between the shot noise under a combined dc and ac bias and that under a dc bias alone. We investigate this quantity in tunneling into Majorana or Andreev bound states, which are of great interest in the search for topological superconductors. Under a harmonic bias $V(t)=V_\mathrm{dc}[1-\cos(Ωt)]$, the excess photon-assisted noise exhibits distinct behaviors: for Majorana or quasi-Majorana bound states, it undergoes multiple sign reversals as $V_\mathrm{dc}$ increases and vanishes at nonzero integer values of $eV_\mathrm{dc}/Ω$ (with $e$ the elementary charge), whereas for zero-energy Andreev bound states--particularly those producing nearly quantized zero-bias conductance peaks--it remains strictly negative over the entire $V_\mathrm{dc}$ range.

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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