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arXiv 1811.04474cond-mat.str-elcond-mat.supr-con
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Majorana库珀对盒链绝缘相的超对称性

Supersymmetry in the Insulating Phase of a Chain of Majorana Cooper Pair Boxes

Hiromi Ebisu, Eran Sagi, Yuval Oreg

摘要:

含有Majorana零模的超导小岛--Majorana库珀对盒--的充电能$U$引起Majorana零模之间的相互作用。考虑到许多这样的盒子的链,当$U$比盒子之间的转移矩阵元素$t$大得多时,发生拓扑超导体-绝缘体转变。在这封信中,我们重点关注这个政权中发生的侮辱性阶段。我们发现,有几个竞争的绝缘相,它们之间的过渡是由一个中心荷$c=7/10$的超对称场论描述。我们通过将模型映射到自旋- $1$系统并通过场论方法得到了这个结果。我们提出的微观模型由一个链的Majorana库珀对盒与\textit{local}隧穿之间的Majorana零模式和\textit{local}充电能量项,它可以控制的栅极电位,从而使其实现更可行。

英文摘要:

The charging energy $U$ of a small superconducting island containing Majorana zero modes---a Majorana Cooper-pair box---induces interactions between the Majorana zero modes. Considering a chain of many such boxes, a topological superconductor-insulator transition occurs when $U$ is much larger than the transfer matrix element $t$ between the boxes. In this Letter, we focus on the insulting phases occurring in this regime. We show that there are several competing insulating phases, and that the transition between them is described by a supersymmetric field theory with a central charge $c=7/10$. We obtain this result by mapping the model to a spin-$1$ system and through a field theoretical approach. The microscopic model we propose consists of a chain of Majorana Cooper-pair boxes with \textit{local} tunneling between Majorana zero modes and \textit{local} charging energy terms, which can be controlled by gate potentials, thus making its realization more feasible.

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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