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arXiv 1908.07692cond-mat.mes-hall
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二维电子气拓扑扭折态的Majorana零模设计

Majorana zero modes by engineering topological kink states in two dimensional electron gas

Shu-guang Cheng, Jie Liu, Haiwen Liu, Hua Jiang, Qing-feng Sun, X. C. Xie

摘要:

Majorana零模(MZMs)-承载拓扑量子计算的潜在应用-在准一维(1D)费米子系统中被验证,包括半导体纳米线、磁性原子链、平面约瑟夫森结。然而,在这些系统中的多带的存在使得MZM脆弱的无序的影响。此外,从实用的角度来看,邻近感应超导可能是困难的,并限制了一维系统。在这里,我们提出了一个灵活的路线来实现MZM通过一维拓扑扭结态通过工程的二维电子气与反点晶格,其中上述问题可以避免由于扭结态的鲁棒性和内在可实现的超导性在高维系统。的MZM被证实是相当强大的对混乱和弯曲的扭结状态,并可以方便地通过改变Rashba自旋轨道耦合强度进行调谐。我们的建议提供了一个可行的实验平台,MZM系统的可操作性和可模拟性的基础上,在二维电子气系统。

英文摘要:

Majorana zero modes (MZMs)--bearing potential applications for topological quantum computing--are verified in quasi-one-dimensional (1D) Fermion systems, including semiconductor nanowires, magnetic atomic chains, planar Josephson junctions. However, the existence of multi-bands in these systems makes the MZMs fragile to the influence of disorder. Moreover, in practical perspective, the proximity induced superconductivity may be difficult and restricted for 1D systems. Here, we propose a flexible route to realize MZMs through 1D topological kink states by engineering a 2D electron gas with antidot lattices, in which both the aforementioned issues can be avoided owing to the robustness of kink states and the intrinsically attainable superconductivity in high-dimensional systems. The MZMs are verified to be quite robust against disorders and the bending of kink states, and can be conveniently tuned by varying the Rashba spin-orbit coupling strength. Our proposal provides an experimental feasible platform for MZMs with systematic manipulability and assembleability based on the present techniques in 2D electron gas system.

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