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Temperature enhancement of thermal Hall conductance quantization | | I. C. Fulga
; Yuval Oreg
; Alexander D. Mirlin
; Ady Stern
; David F. Mross
; | | Date: |
16 Jun 2020 | | Abstract: | 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 natural units $ pi^2 k_B^2 T /3 h$ ($T$ is
temperature, $h$ the Planck constant, $k_B$ the Boltzmann constant). Such a
value was indeed recently observed in a quantum-Hall system and a magnetic
insulator. We show that a non-topological "thermal metal" phase that forms due
to quenched disorder may disguise as a non-Abelian phase 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. | | Source: | arXiv, 2006.9392 | | Services: | Forum | Review | PDF | Favorites | |
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