arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.11209cond-mat.supr-conhep-th
收藏

费米弧中的感生超导

Induced superconductivity in Fermi arcs

Zahra Faraei, S. A. Jafari

摘要:

当外尔半金属(WSM)与超导体(SC)的界面支持费米弧时,手征阻断消除了超导体进入体的诱导。这使得费米弧状态成为邻近问题中唯一的低能自由度。因此,SC| WSM系统将成为一个探测只涉及费米弧的输运性质的平台。在边界条件下,自旋翻转的边界条件,我们发现了一个$Z_2$保护的Bogoliubov费米轮廓(BFC)周围的Bogoliubov准粒子线性分散。由此产生的BFC及其周围的激发在它们对比热的贡献中留下了明显的$T^2$温度依赖性。此外,拓扑保护的BFC是一个马约拉纳费米表面引起的零偏置峰的强度特征性地取决于费米弧的长度和隧道强度。对于在界面处翻转手性的另一BC,而不是BFC,我们具有Bogoliubov-Weyl节点,其位置取决于隧穿强度。

英文摘要:

When the interface of a superconductor (SC) with Weyl semimetal (WSM) supports Fermi arcs, the chirality blockade eliminates the induction of superconductivity into the bulk. This leaves the Fermi arc states as the only low-energy degrees of freedom in the proximity problem. Therefore the SC|WSM system will be a platform to probe transport properties that only involve the Fermi arcs. With a boundary condition that flips the spin at the boundary, we find a $Z_2$ protected Bogoliubov Fermi contour (BFC) around which the Bogoliubov quasi-particles disperse linearly. The resulting BFC and excitations around it leave a distinct $T^2$ temperature dependence in their contribution to specific heat. Furthermore, the topologically protected BFC being a Majorana Fermi surface gives rise to a zero-bias peak the strength of which characteristically depends on the length of Fermi arc and tunneling strength. For the other BC that flips the chirality at the interface, instead of BFCs we have Bogoliubov- Weyl nodes whose location depends on the tunneling strength.

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。

↑