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arXiv 2105.04433cond-mat.mes-hall
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Fu-Kane异质结中Majorana边缘模的手征反转

Chirality inversion of Majorana edge modes in a Fu-Kane heterostructure

A. Donís Vela, G. Lemut, M. J. Pacholski, C. W. J. Beenakker

摘要:

Fu和Kane发现具有诱导s波超导性的拓扑绝缘体(间隙$Δ_0$、费米速度$v_{\rm F}$、费米能量$μ$)支持手性Majorana模在具有磁性绝缘体的表面上沿着边缘传播。我们证明了当边界上的库珀对动量超过$Δ_0^2/μv_{\rm F}$时,超电流的逆流可以使Majorana费米子的运动方向反转。的手征反转的信号由平行于超电流的通道的热导的加倍。此外,反转的边缘可以传输非零电流,由狄拉克模式携带,当马约拉纳模式切换手性时出现。手征反转是有自旋拓扑超导体中马约拉纳费米子的一个独特特征:它不存在于无自旋手征p波配对中。

英文摘要:

Fu and Kane have discovered that a topological insulator with induced s-wave superconductivity (gap $Δ_0$, Fermi velocity $v_{\rm F}$, Fermi energy $μ$) supports chiral Majorana modes propagating on the surface along the edge with a magnetic insulator. We show that the direction of motion of the Majorana fermions can be inverted by the counterflow of supercurrent, when the Cooper pair momentum along the boundary exceeds $Δ_0^2/μv_{\rm F}$. The chirality inversion is signaled by a doubling of the thermal conductance of a channel parallel to the supercurrent. Moreover, the inverted edge can transport a nonzero electrical current, carried by a Dirac mode that appears when the Majorana mode switches chirality. The chirality inversion is a unique signature of Majorana fermions in a spinful topological superconductor: it does not exist for spinless chiral p-wave pairing.

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