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arXiv 2402.01871cond-mat.mes-hall
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二维拓扑绝缘体赝自旋畴壁中的鲁棒马约拉纳束缚态

Robust Majorana bound state in pseudo-spin domain wall of 2-D topological insulator

Subhadeep Chakraborty, Vivekananda Adak, Sourin Das

AI总结:

本文研究二维拓扑绝缘体复合畴壁螺旋边缘态中邻近诱导的马约拉纳束缚态,数值证明其因自旋与赝自旋空间双重正交性而对化学势和磁无序具有异常鲁棒性。

摘要:

我们研究了在由 Bernevig-Hughes-Zhang 哈密顿量支配的二维体中,自旋与赝自旋自由度复合畴壁处涌现的螺旋边缘态(HES),该体系经历了从量子自旋霍尔到反常霍尔的转变。我们数值研究了在这些螺旋边缘态中由于邻近诱导超导而形成的马约拉纳束缚态(MBS)的稳定性。我们证明,由于右行和左行模式在自旋和赝自旋空间中同时存在正交性,马约拉纳束缚态对中等强度的化学势或磁无序表现出异常强的鲁棒性。因此,我们的方案可能为实现二维平台上的鲁棒马约拉纳束缚态铺平道路。

英文摘要:

We investigate helical edge states (HES) emerging at the composite domain wall of spin and pseudo-spin degrees of freedom in a 2-D bulk governed by the Bernevig-Hughes-Zhang Hamiltonian which underwent quantum spin Hall to anomalous Hall transition. We numerically study the stability of Majorana bound state (MBS) formed due to proximity induced superconductivity in these helical edge states. We establish exceptional robustness of MBS against moderate chemical potential or magnetic disorder owing to the existence of the simultaneous orthogonality between the right and the left moving modes both in spin and pseudo-spin space. Hence our proposal could pave the way to realizing robust Majorana bound state on 2D platforms.

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。

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