Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.235430
Sachiraj Mishra, Colin Benjamin
{"title":"Reaching the Van den Broeck limit in linear response and the Whitney limit in nonlinear response in edge mode quantum thermoelectrics and refrigeration","authors":"Sachiraj Mishra, Colin Benjamin","doi":"10.1103/physrevb.110.235430","DOIUrl":"https://doi.org/10.1103/physrevb.110.235430","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"34 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.214211
Alexander C. Tyner, Cormac Grindall, J. H. Pixley
In two-dimensional topological insulators, a disorder-induced topological phase transition is typically identified with an Anderson localization transition at the Fermi energy. However, in Z2 trivial, spin-resolved topological insulators it is the spectral gap of the spin spectrum, in addition to the bulk mobility gap, which protects the nontrivial topology of the ground state. In this work, we show that these two gaps, the bulk electronic and spin gap, can evolve distinctly on the introduction of quenched short-ranged disorder and that an odd-quantized spin Chern number topologically protects states below the Fermi energy from localization. This decoupling leads to a unique situation in which an Anderson localization transition occurs below the Fermi energy at the topological transition. Furthermore, the presence of topologically protected extended bulk states nontrivial bulk topology typically implies the existence of protected boundary modes. We demonstrate the absence of protected boundary modes in the Hamiltonian and yet the edge modes in the eigenstates of the projected spin operator survive. Our work thus provides evidence that a nonzero spin-Chern number, in the absence of a nontrivial Z2 index, does not demand the existence of protected boundary modes at finite or zero energy. Published by the American Physical Society2024
{"title":"Decoupling the electronic gap from the spin Chern number in spin-resolved topological insulators","authors":"Alexander C. Tyner, Cormac Grindall, J. H. Pixley","doi":"10.1103/physrevb.110.214211","DOIUrl":"https://doi.org/10.1103/physrevb.110.214211","url":null,"abstract":"In two-dimensional topological insulators, a disorder-induced topological phase transition is typically identified with an Anderson localization transition at the Fermi energy. However, in Z</a:mi>2</a:mn></a:msub></a:math> trivial, spin-resolved topological insulators it is the spectral gap of the spin spectrum, in addition to the bulk mobility gap, which protects the nontrivial topology of the ground state. In this work, we show that these two gaps, the bulk electronic and spin gap, can evolve distinctly on the introduction of quenched short-ranged disorder and that an odd-quantized spin Chern number topologically protects states below the Fermi energy from localization. This decoupling leads to a unique situation in which an Anderson localization transition occurs below the Fermi energy at the topological transition. Furthermore, the presence of topologically protected extended bulk states nontrivial bulk topology typically implies the existence of protected boundary modes. We demonstrate the absence of protected boundary modes in the Hamiltonian and yet the edge modes in the eigenstates of the projected spin operator survive. Our work thus provides evidence that a nonzero spin-Chern number, in the absence of a nontrivial <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:msub><c:mi mathvariant=\"double-struck\">Z</c:mi><c:mn>2</c:mn></c:msub></c:math> index, does not demand the existence of protected boundary modes at finite or zero energy. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2024</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"4 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.245144
M. Alvarado, A. Levy Yeyati, Ramón Aguado, R. Seoane Souto
{"title":"Interplay between Majorana and Shiba states in a minimal Kitaev chain coupled to a superconductor","authors":"M. Alvarado, A. Levy Yeyati, Ramón Aguado, R. Seoane Souto","doi":"10.1103/physrevb.110.245144","DOIUrl":"https://doi.org/10.1103/physrevb.110.245144","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"93 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.214113
Janet Zhong, Heming Wang, Shanhui Fan
{"title":"Pole and zero edge state invariant for one-dimensional non-Hermitian sublattice symmetry","authors":"Janet Zhong, Heming Wang, Shanhui Fan","doi":"10.1103/physrevb.110.214113","DOIUrl":"https://doi.org/10.1103/physrevb.110.214113","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"31 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.224113
Gustavo H. Cassemiro, C. David Hinostroza, Leandro Rodrigues de Faria, Daniel A. Mayoh, Jie Liu, Maria C. O. Aguiar, Martin R. Lees, Geetha Balakrishnan, J. Larrea Jiménez, Antonio Jefferson da Silva Machado, Valentina Martelli, Walber H. Brito
{"title":"Role of native point defects and Hg impurities in the electronic properties of Bi4I4","authors":"Gustavo H. Cassemiro, C. David Hinostroza, Leandro Rodrigues de Faria, Daniel A. Mayoh, Jie Liu, Maria C. O. Aguiar, Martin R. Lees, Geetha Balakrishnan, J. Larrea Jiménez, Antonio Jefferson da Silva Machado, Valentina Martelli, Walber H. Brito","doi":"10.1103/physrevb.110.224113","DOIUrl":"https://doi.org/10.1103/physrevb.110.224113","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"4 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.235157
Yi-Ming Wu, Josephine J. Yu, S. Raghu
{"title":"Shot noise in a phenomenological model of a marginal Fermi liquid","authors":"Yi-Ming Wu, Josephine J. Yu, S. Raghu","doi":"10.1103/physrevb.110.235157","DOIUrl":"https://doi.org/10.1103/physrevb.110.235157","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"93 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-27DOI: 10.1103/physrevb.110.245426
Jinhong Park, Yuval Gefen
{"title":"Manifestation of edge-bulk incompatibility in the fractional quantum Hall platform","authors":"Jinhong Park, Yuval Gefen","doi":"10.1103/physrevb.110.245426","DOIUrl":"https://doi.org/10.1103/physrevb.110.245426","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"71 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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