Detecting a Majorana-fermion zero mode using a quantum dot
Detecting a Majorana-fermion zero mode using a quantum dot
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DOI：
10.1103/physrevb.84.201308
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发表时间：
2011-11-16
影响因子：
3.7
通讯作者：
Baranger, Harold U.
中科院分区：
文献类型：
--
作者：
Liu, Dong E.;Baranger, Harold U.
我们提出了一个实验装置，用于检测由耦合到p波超导纳米线末端的无自旋量子点组成的马约拉纳零模。导线末端的马约拉纳束缚态强烈影响通过量子点的电导：驱动导线通过拓扑相变会导致电导急剧跃升1/2倍。在拓扑阶段，点电导的零温度峰值（即，当点处于谐振状态并且对称地耦合到引线时）是E（2）/2 H。相比之下，如果导线处于其平凡相位，则电导峰值为e（2）/h，或者如果在导线的末端出现规则的费米子零模，则电导为0。该系统还可以用于调谐Flensberg的量子位系统[Phys. Rev. Lett. 106，090503（2011）]至所需的简并点。
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 [Phys. Rev. Lett. 106, 090503 (2011)] to the required degeneracy point.