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arXiv 1207.5907cond-mat.mes-hallcond-mat.supr-con
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具有Majorana费米子的超导纳米线的真实输运模型

Towards a realistic transport modeling in a superconducting nanowire with Majorana fermions

Diego Rainis, Luka Trifunovic, Jelena Klinovaja, Daniel Loss

摘要:

受最近在混合超导纳米结构中寻找马约拉纳费米子(MF)的实验的启发,我们考虑了一个现实的紧束缚模型,并对其输运行为进行了数值分析。特别是,我们考虑到超导接触的存在,在实际实验中用于提取电流,这通常不包括在理论计算中。我们发现,出现的重要功能,是缺乏在更简单的模型,如邻近间隙信号的能量的转移,和增强的可见性的拓扑间隙增加自旋轨道相互作用。我们发现振荡的零偏置峰值作为磁场的函数,并研究它们的分析。我们认为,许多实验观察到的功能暗示在一个实际的自旋轨道相互作用大于一个通常假设。然而,即使考虑到所有已知的成分的实验和探索许多参数制度的MF,我们无法达到完全一致的报告数据。因此,不能排除所观察到的零偏倚峰的不同物理来源。

英文摘要:

Motivated by recent experiments searching for Majorana fermions (MFs) in hybrid semiconducting-superconducting nanostructures, we consider a realistic tight-binding model and analyze its transport behavior numerically. In particular, we take into account the presence of a superconducting contact, used in real experiments to extract the current, which is usually not included in theoretical calculations. We show that important features emerge that are absent in simpler models, such as the shift in energy of the proximity gap signal, and the enhanced visibility of the topological gap for increased spin-orbit interaction. We find oscillations of the zero bias peak as a function of the magnetic field and study them analytically. We argue that many of the experimentally observed features hint at an actual spin-orbit interaction larger than the one typically assumed. However, even taking into account all the known ingredients of the experiments and exploring many parameter regimes for MFs, we are not able to reach full agreement with the reported data. Thus, a different physical origin for the observed zero-bias peak cannot be excluded.

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