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강상관계 물질 연구단
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Linking structures of doubly charged nodal surfaces in centrosymmetric superconductors

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Title
Linking structures of doubly charged nodal surfaces in centrosymmetric superconductors
Author(s)
강상관계 물질 연구단; 강상관계 물질 연구단; Bohm-Jung Yang
Publication Date
2021-06
Journal
PHYSICAL REVIEW B, v.103, no.22
Publisher
AMER PHYSICAL SOC
Abstract
In topological semimetals and nodal superconductors, band crossings between occupied and unoccupied bands form stable nodal points/lines/surfaces carrying quantized topological charges. In particular, in centrosymmetric superconductors, some nodal structures at the Fermi energy E-F carry two distinct topological charges, and thus they are called doubly charged nodes. Here we show that doubly charged nodal surfaces of centrosymmetric superconductors in three dimensions always develop peculiar linking structures with nodal points or lines formed between occupied bands below E-F. Such linking structures can naturally explain the inherent relationship between the charge of the node below E-F and the two charges of the nodal surfaces at E-F. Based on the Altland-Zirnbauer (AZ)-type tenfold classification of nodes with additional inversion I symmetry, which is called the AZ+I classification, we provide the complete list of linking structures of doubly charged nodes in centrosymmetric superconductors. The linking structures of doubly charged nodes clearly demonstrate that not only the local band structure around the node but also the global band structure plays a critical role in characterizing gapless topological phases.
URI
https://pr.ibs.re.kr/handle/8788114/10085
DOI
10.1103/PhysRevB.103.224523
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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