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arXiv 2302.04710cond-mat.mes-hallcond-mat.supr-con
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小磁场下迈斯纳效应诱导的 Majorana 零模

Meissner effect induced Majorana zero modes at small magnetic field

Xiao-Hong Pan, Li Chen, Dong E. Liu, Fu-Chun Zhang, Xin Liu

AI总结:

本文提出利用迈斯纳效应在 SC/TI/SC 混合体系中诱导拓扑超导相,将 MZMs 所需磁场降至 10 mT 以下,并可通过相位差调控其数量与位置。

摘要:

实现 Majorana 零模(MZMs)的一个根本困难在于所需的高磁场,这会引发严重问题,例如使超导能隙缩小、拓扑区域减小,并削弱其对无序的鲁棒性。在本工作中,我们提出迈斯纳效应可以为超导体/拓扑绝缘体/超导体(SC/TI/SC)混合体系带来拓扑超导相。值得注意的是,支撑 MZMs 所需的磁场强度(<10 mT)与以往方案中的磁场强度(>0.5 T)相比降低了几个数量级。调节顶部与底部超导体之间的相位差可以控制 MZMs 的数量和位置。此外,我们通过自洽 Schrödinger-Poisson 计算考虑了超导体/拓扑绝缘体(SC/TI)界面中的静电势,这表明我们的方案具有实验可实现性。我们的方案仅需小于 10 mT 的小磁场,并且对化学势涨落具有鲁棒性,这使 SC/TI/SC 混合体系成为理想的 Majorana 平台。

英文摘要:

One fundamental difficulty in realizing Majorana zero modes (MZMs) is the required high magnetic field, which causes serious issues, e.g., shrinks the superconducting gap, reduces topological region, and weakens their robustness against disorder. In this work, we propose that the Meissner effect can bring the topological superconducting phase to a superconductor/topological-insulator/superconductor (SC/TI/SC) hybrid system. Remarkably, the required magnetic field strength ($<$10 mT) to support MZMs has been reduced by several orders of magnitude compared to that ($>$0.5 T) in the previous schemes. Tuning the phase difference between the top and bottom superconductors can control the number and position of the MZMs. In addition, we account for the electrostatic potential in the superconductor/topological-insulator (SC/TI) interface through the self-consistent Schrödinger-Poisson calculation, which shows the experimental accessibility of our proposal. Our proposal only needs a small magnetic eld of less than 10 mT and is robust against the chemical potential fluctuation, which makes SC/TI/SC hybrid an ideal Majorana platform.

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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