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Article: Switching Spinless and Spinful Topological Phases with Projective PT Symmetry

TitleSwitching Spinless and Spinful Topological Phases with Projective PT Symmetry
Authors
Issue Date2021
Citation
Physical Review Letters, 2021, v. 126, n. 19, article no. 196402 How to Cite?
AbstractA fundamental dichotomous classification for all physical systems is according to whether they are spinless or spinful. This is especially crucial for the study of symmetry-protected topological phases, as the two classes have distinct symmetry algebra. As a prominent example, the spacetime inversion symmetry PT satisfies (PT)2=±1 for spinless/spinful systems, and each class features unique topological phases. Here, we reveal a possibility to switch the two fundamental classes via Z2 projective representations. For PT symmetry, this occurs when P inverses the gauge transformation needed to recover the original Z2 gauge connections under P. As a result, we can achieve topological phases originally unique for spinful systems in a spinless system, and vice versa. We explicitly demonstrate the claimed mechanism with several concrete models, such as Kramers degenerate bands and Kramers Majorana boundary modes in spinless systems, and real topological phases in spinful systems. Possible experimental realization of these models is discussed. Our work breaks a fundamental limitation on topological phases and opens an unprecedented possibility to realize intriguing topological phases in previously impossible systems.
Persistent Identifierhttp://hdl.handle.net/10722/335034
ISSN
2023 Impact Factor: 8.1
2023 SCImago Journal Rankings: 3.040
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhao, Y. X.-
dc.contributor.authorChen, Cong-
dc.contributor.authorSheng, Xian Lei-
dc.contributor.authorYang, Shengyuan A.-
dc.date.accessioned2023-10-24T08:28:36Z-
dc.date.available2023-10-24T08:28:36Z-
dc.date.issued2021-
dc.identifier.citationPhysical Review Letters, 2021, v. 126, n. 19, article no. 196402-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/335034-
dc.description.abstractA fundamental dichotomous classification for all physical systems is according to whether they are spinless or spinful. This is especially crucial for the study of symmetry-protected topological phases, as the two classes have distinct symmetry algebra. As a prominent example, the spacetime inversion symmetry PT satisfies (PT)2=±1 for spinless/spinful systems, and each class features unique topological phases. Here, we reveal a possibility to switch the two fundamental classes via Z2 projective representations. For PT symmetry, this occurs when P inverses the gauge transformation needed to recover the original Z2 gauge connections under P. As a result, we can achieve topological phases originally unique for spinful systems in a spinless system, and vice versa. We explicitly demonstrate the claimed mechanism with several concrete models, such as Kramers degenerate bands and Kramers Majorana boundary modes in spinless systems, and real topological phases in spinful systems. Possible experimental realization of these models is discussed. Our work breaks a fundamental limitation on topological phases and opens an unprecedented possibility to realize intriguing topological phases in previously impossible systems.-
dc.languageeng-
dc.relation.ispartofPhysical Review Letters-
dc.titleSwitching Spinless and Spinful Topological Phases with Projective PT Symmetry-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevLett.126.196402-
dc.identifier.pmid34047612-
dc.identifier.scopuseid_2-s2.0-85106378206-
dc.identifier.volume126-
dc.identifier.issue19-
dc.identifier.spagearticle no. 196402-
dc.identifier.epagearticle no. 196402-
dc.identifier.eissn1079-7114-
dc.identifier.isiWOS:000652838500020-

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