Dynamic current susceptibility as a probe of Majorana bound states in nanowire-based Josephson junctions
Dynamic current susceptibility as a probe of Majorana bound states in nanowire-based Josephson junctions
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动态电流磁化率作为纳米线约瑟夫森结中马约拉纳束缚态的探针
DOI：
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发表时间：
2017
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通讯作者：
P. Simon
中科院分区：
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作者：
M. Trif;O. Dmytruk;H. Bouchiat;R. Aguado;P. Simon
我们从理论上研究了基于半导体纳米线的约瑟夫森结，该约瑟夫森结受到时间相关的通量偏置的影响。我们为马约拉纳结的动态响应建立了通用密度矩阵方法，并使用纳米线的微观和有效的低能量描述来计算由此产生的通量依赖性磁化率。我们发现，与马约拉纳州种群动态相关的磁化率的对角线分量在广泛的实验相关参数中主导着标准 Kubo 贡献。对角项迄今为止在马约拉纳物理学的背景下尚未被探索，它允许准确地探测结中马约拉纳束缚态的存在。
We theoretically study a Josephson junction based on a semiconducting nanowire subject to a time-dependent flux bias. We establish a general density matrix approach for the dynamical response of the Majorana junction and calculate the resulting flux-dependent susceptibility using both microscopic and effective low-energy descriptions for the nanowire. We find that the diagonal component of the susceptibility, associated with the dynamics of the Majorana states populations, dominates over the standard Kubo contribution for a wide range of experimentally relevant parameters. The diagonal term, thus far unexplored in the context of Majorana physics, allows to probe accurately the presence of Majorana bound states in the junction.