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arXiv 1902.02532cond-mat.supr-con
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邻近感生超导模型中的拓扑跃迁

Topological Transitions in a Model for Proximity Induced Superconductivity

Navketan Batra, Swagatam Nayak, Sanjeev Kumar

摘要:

利用双层正方晶格上邻近感应超导的原型模型,我们表明,层间隧穿可以驱动Bogoliubov准粒子带的拓扑结构的变化。从拓扑平凡的超导体,过渡到一个非平凡的$p_x + {\rm i} p_y$状态,并返回到另一个平凡的状态被发现。我们描述这些阶段的边缘状态谱和陈指标。我们表明,这些转变也可以控制实验可行的控制参数,金属层的带宽和栅极电位。从我们的结果的一个简单的模型邻近诱导超导的见解可能会开辟一条新的路线,发现拓扑超导体。

英文摘要:

Using a prototype model for proximity induced superconductivity on a bilayer square lattice, we show that interlayer tunneling can drive change in topology of the Bogoliubov quasiparticle bands. Starting with topologically trivial superconductors, transitions to a non-trivial $p_x + {\rm i} p_y$ state and back to another trivial state are discovered. We characterize these phases in terms of edge-state spectra and Chern indices. We show that these transitions can also be controlled by experimentally viable control parameters, the bandwidth of the metallic layer and the gate potential. Insights from our results on a simple model for proximity induced superconductivity may open up a new route to discover topological superconductors.

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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