II 型狄拉克半金属中的铰链马约拉纳平带

IF 6.4 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Science China Physics, Mechanics & Astronomy Pub Date : 2024-10-25 DOI:10.1007/s11433-024-2483-8

Yue Xie, Xianxin Wu, Zhong Fang, Zhijun Wang

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引用次数: 0

摘要

第二类狄拉克半金属表现出独特的费米面拓扑结构，这使它们能够承载新型拓扑超导（TSC）。我们揭示了一种新的轨道间超导态，与 D4h 点群下的 B1u 和 B2u 配对相对应。有趣的是，我们发现一阶和二阶 TSC 同时存在于这种新状态中。它是由占主导地位的轨道间吸引力诱导的，具有表面螺旋马约拉纳锥和铰链马约拉纳平带，横跨整个 z 向铰链布里渊区。进一步的研究发现，这些高阶铰链模式对 C4z 对称性破坏扰动具有稳健性。

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Hinge Majorana flat band in type-II Dirac semimetals

Type-II Dirac semimetals exhibit a unique Fermi surface topology, which allows them to host novel topological superconductivity (TSC). We reveal a novel inter-orbital superconducting state, corresponding to the B_1u and B_2u pairings under the D_4h point group. Intriguingly, we find that both first- and second-order TSC coexist in this novel state. It is induced by a dominant inter-orbital attraction and possesses surface helical Majorana cones and hinge Majorana flat bands, spanning the entire z-directed hinge Brillouin zone. Further investigation uncovers that these higher-order hinge modes are robust against the C_4z symmetry-breaking perturbation.

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来源期刊

Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-

CiteScore

10.30

自引率

6.20%

发文量

4047

审稿时长

3 months

期刊介绍： Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.