Topological Kondo Effect in Transport through a Superconducting Wire with Multiple Majorana End States
Topological Kondo Effect in Transport through a Superconducting Wire with Multiple Majorana End States
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DOI：
10.1103/physrevlett.114.116801
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发表时间：
2015-03-16
影响因子：
8.6
通讯作者：
Timm, Carsten
中科院分区：
文献类型：
--
作者：
Kashuba, Oleksiy;Timm, Carsten
我们研究了在拓扑超导导线末端耦合到正常引线的多个马约拉纳态系统。对于界面处至少有三个马约拉纳费米子，我们发现了非平凡重整化物理。界面隧穿过程可以根据SU(2)群的自旋-1/2和自旋-3/2不可约表示进行分类。我们证明了属于不同表示的隧道振幅的重正态化是完全不同的，其中一种类型被抑制，而另一种则被增强，这取决于kondo型相互作用耦合的符号。这导致隧道电流通过界面的不同温度依赖性和该电流的不同自旋极化。
We investigate a system of multiple Majorana states at the end of a topological superconducting wire coupled to a normal lead. For a minimum of three Majorana fermions at the interface, we find nontrivial renormalization physics. Interface tunneling processes can be classified in terms of spin-1/2 and spin-3/2 irreducible representations of the SU(2) group. We show that the renormalization of the tunneling amplitudes belonging to different representations is completely different in that one type is suppressed, whereas the other is enhanced, depending on the sign of the Kondo-type interaction coupling. This results in distinct temperature dependencies of the tunneling current through the interface and different spin polarizations of this current.