arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1303.7447cond-mat.mes-hallquant-ph
收藏

圆柱形纳米线中Majorana模的出现

Emergence of Majorana modes in cylindrical nanowires

Jong Soo Lim, Rosa López, Llorenç Serra

摘要:

我们提出了计算的Majorana边缘模式在圆柱形纳米线的半导体材料与邻近诱导超导。我们考虑沿横向的Rashba场和任意方向的外加磁场。我们的分析是基于精确的数值对角化的有限圆柱和复杂的能带结构的半无限的。轨道效应是负责的临界场的有效间隙消失的强各向异性。鲁棒的马约拉纳模式诱导的平行场分量,我们发现政权与一个以上的马约拉纳模式在同一边缘。在实验上,它们将表现为作为磁场的函数的零偏置电导的特定序列。在有限圆柱中,由于两个边缘的干涉导致Majorana模式的退化,对于足够大的场,导致振荡的非零能量。

英文摘要:

We present calculations of Majorana edge modes in cylindrical nanowires of a semiconductor material with proximity-induced superconductivity. We consider a Rashba field along the transverse direction and an applied magnetic field in arbitrary orientation. Our analysis is based on exact numerical diagonalizations for the finite cylinder and on the complex band structure for the semi-infinite one. Orbital effects are responsible for a strong anisotropy of the critical field for which the effective gap vanishes. Robust Majorana modes are induced by the parallel field component and we find regimes with more than one Majorana mode on the same edge. Experimentally, they would manifest as a specific sequence of zero-bias conductances as a function of magnetic field. In the finite cylinder, a degradation of the Majorana modes due to interference of the two edges leads to oscillating non zero energies for large enough fields.

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。

↑