Josephson radiation from nonlinear dynamics of Majorana zero modes

Josephson radiation from nonlinear dynamics of Majorana zero modes
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马约拉纳零模非线性动力学的约瑟夫森辐射

DOI:
10.1103/physrevb.101.180504
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发表时间:
2019-12
期刊:
影响因子:
3.7
通讯作者:
Niu Qian
Niu Qian
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Feng Jia-Jin;Huang Zhao;Wang Zhi;Niu Qian

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约瑟夫森辐射是探测拓扑超导体中Majorana零模的一种有效方法。最近,约瑟夫森辐射的约瑟夫森频率的一半已被实验观察到在碲汞基结,可能从马约拉纳零模式。然而,这种辐射在临界电压以上消失,与以前的理论结果严重矛盾。在这项工作中,我们从理论上获得的辐射光谱定量与实验一致后,包括非线性动力学的马约拉纳状态到标准的反向分流结模型。我们进一步预测两个新的结构的辐射光谱为未来的实验验证:一个中断的发射线和混沌政权。我们开发了一个定点分析来理解所有这些功能。我们的研究结果解决了理论和实验之间的明显差异,并将激发重新审视各种拓扑约瑟夫森结的辐射光谱中的结构。
Josephson radiation is a powerful method to probe Majorana zero modes in topological superconductors. Recently, Josephson radiation with half the Josephson frequency has been experimentally observed in a HgTe-based junction, possibly from Majorana zero modes. However, this radiation vanishes above a critical voltage, sharply contradicting previous theoretical results. In this work, we theoretically obtain a radiation spectrum quantitatively in agreement with the experiment after including the nonlinear dynamics of the Majorana states into the standard resistively shunted junction model. We further predict two new structures of the radiation spectrum for future experimental verification: an interrupted emission line and a chaotic regime. We develop a fixed-point analysis to understand all these features. Our results resolve an apparent discrepancy between theory and experiments, and will inspire reexamination of structures in radiation spectra of various topological Josephson junctions.
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