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arXiv 1107.4338cond-mat.mes-hallcond-mat.supr-con
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利用量子点探测Majorana-Fermion零模

Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot

Dong E. Liu, Harold U. Baranger

摘要:

我们提出了一个实验装置,用于检测由无自旋量子点耦合到p波超导纳米线的末端组成的马约拉纳零模。导线末端的马约拉纳束缚态强烈地影响了通过量子点的电导:驱动导线通过拓扑相变会导致电导急剧跳跃1/2。在拓扑阶段,点电导的零温度峰值(即当点处于谐振状态并对称耦合到引线时)为e^2/2 h。相反,如果导线处于平凡相,则电导峰值为e^2/h,或者如果导线末端出现规则的费米子零模,则电导为0。该系统还可以用于将Flensberg的量子位系统[PRL 106,090503(2011)]调谐到所需的简并点。

英文摘要:

We propose an experimental setup for detecting a Majorana zero mode consisting of a spinless quantum dot coupled to the end of a p-wave superconducting nanowire. The Majorana bound state at the end of the wire strongly influences the conductance through the quantum dot: Driving the wire through the topological phase transition causes a sharp jump in the conductance by a factor of 1/2. In the topological phase, the zero temperature peak value of the dot conductance (i.e. when the dot is on resonance and symmetrically coupled to the leads) is e^2/2h. In contrast, if the wire is in its trivial phase, the conductance peak value is e^2/h, or if a regular fermionic zero mode occurs on the end of the wire, the conductance is 0. The system can also be used to tune Flensberg's qubit system [PRL 106, 090503 (2011)] to the required degeneracy point.

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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