Transport signatures of fractional fermions in Rashba nanowires.
Transport signatures of fractional fermions in Rashba nanowires.
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DOI：
10.1103/physrevlett.112.196803
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发表时间：
2013-09
影响因子：
8.6
通讯作者：
Diego Rainis;A. Saha;J. Klinovaja;Luka Trifunovic;D. Loss
中科院分区：
文献类型：
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作者：
Diego Rainis;A. Saha;J. Klinovaja;Luka Trifunovic;D. Loss
我们从理论上研究通过半导体Rashba纳米线（NW）在均匀和空间调制磁场的存在下的运输。该系统是完全带隙的，并且自旋轨道相互作用和磁场之间的相互作用导致纳米线的每一端处的Jackiw-Rebbi类型的分数带电费米子（FF）束缚态。我们研究了N/NW/N系统的传输和噪声行为，其中导线由两个正常的引线（N）接触，我们寻找可能的签名，可以帮助在实验中检测这种状态。我们发现，微分电导和散粒噪声表现出一个subgap结构，充分揭示了FF态的存在。替代地，通过Aharonov-Bohm设置中的电导测量提供FF存在的另一确认，其中FF负责具有双倍周期的振荡。我们的预测可以在InSb/InAs纳米线中进行测试，并且在本技术的范围内。
We theoretically study transport through a semiconducting Rashba nanowire (NW) in the presence of uniform and spatially modulated magnetic fields. The system is fully gapped, and the interplay between the spin orbit interaction and the magnetic fields leads to fractionally charged fermion (FF) bound states of the Jackiw-Rebbi type at each end of the nanowire. We investigate the transport and noise behavior of a N/NW/N system, where the wire is contacted by two normal leads (N), and we look for possible signatures that could help in the experimental detection of such states. We find that the differential conductance and the shot noise exhibit a subgap structure which fully reveals the presence of the FF state. Alternatively, another confirmation of the presence of the FFs is provided by a conductance measurement in an Aharonov-Bohm setup, where the FFs are responsible for oscillations with double period. Our predictions can be tested in InSb/InAs nanowires and are within reach of the present technology.