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Temperature Enhancement of Thermal Hall Conductance Quantization

Fulga, I. C.; Oreg, Yuval; Mirlin, Alexander D.; Stern, Ady; Mross, David F.

Abstract (englisch):
The quest for non-Abelian quasiparticles has inspired decades of experimental and theoretical efforts, where the scarcity of direct probes poses a key challenge. Among their clearest signatures is a thermal Hall conductance with quantized half-integer value in units of κ0=π2k2BT/3h (T is temperature, h the Planck constant, kB the Boltzmann constant). Such values were recently observed in a quantum-Hall system and a magnetic insulator. We show that nontopological “thermal metal” phases that form due to quenched disorder may disguise as non-Abelian phases by well approximating the trademark quantized thermal Hall response. Remarkably, the quantization here improves with temperature, in contrast to fully gapped systems. We provide numerical evidence for this effect and discuss its possible implications for the aforementioned experiments.

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DOI: 10.1103/PhysRevLett.125.236802
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
KITopen-ID: 1000127299
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 125
Heft 23
Seiten Art.-Nr.: 236802
Vorab online veröffentlicht am 02.12.2020
Nachgewiesen in Web of Science
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