Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong, People's Republic of China.
Phys Rev Lett. 2009 Dec 4;103(23):237001. doi: 10.1103/PhysRevLett.103.237001. Epub 2009 Dec 2.
We describe experimental signatures of Majorana fermion edge states, which form at the interface between a superconductor and the surface of a topological insulator. If a lead couples to the Majorana fermions through electron tunneling, the Majorana fermions induce resonant Andreev reflections from the lead to the grounded superconductor. The linear tunneling conductance is 0 (2e(2)/h) if there is an even (odd) number of vortices in the superconductor. Similar resonance occurs for tunneling into the zero mode in the vortex core. We also study the current and noise of a two-lead device.
我们描述了在超导材料和拓扑绝缘体表面之间形成的马约拉纳费米子边缘态的实验特征。如果一个引线通过电子隧道耦合到马约拉纳费米子，那么马约拉纳费米子会诱导从引线到接地超导材料的共振安德烈夫反射。如果超导材料中有偶数（奇数）个磁通涡旋，线性隧道电导为 0（2e(2)/h）。类似的共振也会发生在进入磁通涡旋核心的零模的隧道中。我们还研究了双引线器件的电流和噪声。
