arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1402.6598cond-mat.str-elcond-mat.mes-hallcond-mat.supr-con
收藏

利用拓扑绝缘体与d波高温超导体的邻近效应实现Majorana零模

Realizing Majorana Zero Modes by Proximity Effect between Topological Insulators and d-wave High-Temperature Superconductors

Zi-Xiang Li, Cheung Chan, Hong Yao

摘要:

从理论上研究了高温d波超导体(dSC)与拓扑绝缘体(TI)之间的超导邻近效应。当TI-dSC异质结构违反90度旋转和一定的反射对称性,我们表明,一个相当大的s波配对,共存的d波之一,出现在邻近诱导的超导电性在TI的顶面状态。弱无序进一步抑制d-波配对,但不是s-波一个在TI的表面状态。更重要的是,当表面态的费米口袋相对较小时,表面态的配对能隙是无节点的,并且接近各向同性。我们的理论结果定性地解释了最近的实验证据的近各向同性配对间隙的Bi_2Se_3的表面态诱导接近高T_c铜酸盐Bi_2Ca_2Cu_2 O_{8+δ}。我们还展示了令人信服的证据马约拉纳零模式的磁hc/2 e涡核,这可能是在未来的实验中检测。

英文摘要:

We theoretically study superconducting proximity effect between a topological insulator (TI) and a high-temperature d-wave superconductor (dSC). When the TI-dSC heterostructure violates 90 degree-rotation and certain reflection symmetries, we show that a sizable s-wave pairing, coexisting with a d-wave one, emerges in the proximity-induced superconductivity in the TI's top surface states. Weak disorder further suppresses d-wave pairing but not s-wave one in the TI's surface states. More importantly, the pairing gap in surface states is found to be nodeless and nearly-isotropic when the Fermi pocket of surface states is relatively small. Our theoretical results qualitatively explain recent experimental evidences of a nearly-isotropic pairing gap on surface states of Bi_2Se_3 induced by proximity with high-T_c cuprate Bi_2Ca_2Cu_2O_{8+δ}. We also demonstrate convincing evidences of Majorana zero modes in a magnetic hc/2e vortex core, which may be detectable in future experiments.

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。

↑