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Quantization of topological indices in critical chains at low temperatures
Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden..
Nordita SU.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Department of Physics, Stockholm University, AlbaNova University Center, Stockholm, SE-106 91, Sweden.ORCID iD: 0000-0003-2258-1945
2022 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 106, no 4, article id 045116Article in journal (Refereed) Published
Abstract [en]

Various types of topological phenomena at criticality are currently under active research. In this paper we suggest to generalize the known topological quantities to finite temperatures, allowing us to consider gapped and critical (gapless) systems on the same footing. It is then discussed that the quantization of the topological indices, also at critically, is retrieved by taking the low-temperature limit. This idea is explicitly illustrated on a simple case study of chiral critical chains where the quantization is shown analytically and verified numerically. The formalism is also applied for studying robustness of the topological indices to various types of disordering perturbations.

Place, publisher, year, edition, pages
American Physical Society (APS) , 2022. Vol. 106, no 4, article id 045116
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-316299DOI: 10.1103/PhysRevB.106.045116ISI: 000834338800001Scopus ID: 2-s2.0-85134877094OAI: oai:DiVA.org:kth-316299DiVA, id: diva2:1686933
Note

QC 20220812

Available from: 2022-08-12 Created: 2022-08-12 Last updated: 2022-08-12Bibliographically approved

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Hermanns, Maria

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