Gapless vortex bound states in superconducting topological semimetals.

Gapless vortex bound states in superconducting topological semimetals.
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超导拓扑半金属中的无间隙涡旋束缚态

DOI:
10.1093/nsr/nwac121
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发表时间:
2023-02
影响因子:
20.6
通讯作者:
--
中科院分区:
综合性期刊1区
文献类型:
--
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我们发现,由于正常状态下的拓扑无质量激发,超导拓扑半金属中的涡旋束缚态是无间隙的。我们在各种半金属中证明了这一普遍结果,包括Dirac和Weyl半金属,三重简并的自旋1费米子,自旋3/2 Rarita-Schwinger-Weyl费米子半金属和其他奇异的费米子半金属。这些无间隙束缚态的形成与它们在π相超导体-正常金属-超导体结中的安德烈夫镜面反射和传播安德烈夫模密切相关。我们进一步证明了这些无缝态是受拓扑保护的,并且可以从拓扑泵浦过程中得到。证明了在各种超导拓扑半金属中存在无间隙涡旋束缚态,这是由于正常状态下的拓扑无质量激发而产生的普遍性质。
We find that the vortex bound states in superconducting topological semimetals are gapless owing to topological massless excitations in their normal states. We demonstrate this universal result in a variety of semimetals, including Dirac and Weyl semimetals, three-fold degenerate spin-1 fermions, spin-3/2 Rarita-Schwinger-Weyl fermion semimetals and other exotic fermion semimetals. The formation of these gapless bound states is closely related to their Andreev specular reflection and propagating Andreev modes in π-phase superconductor-normal metal-superconductor junctions. We further demonstrate that these gapless states are topologically protected and can be derived from a topological pumping process. The authors demonstrate the existence of gapless vortex bound states in various superconducting topological semimetals, which is a universal property due to topological massless excitations in their normal states.
外尔半金属 TaAs 的实验发现
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