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29 March 2024
 
  » arxiv » 1905.4248

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The thermal Hall conductance of a symmetry-breaking topological insulator
Zi-Xiang Li ; Dung-Hai Lee ;
Date 10 May 2019
AbstractIn this note we point out that a model proposed by Hsu, Raghu and Chakravarty[1] has the potential to explain the unusual thermal Hall effect reported in Ref.[2]. This model describes a topological insulator that breaks the spin rotation and point group symmetries. But it preserves the time-reversal symmetry. This insulator possesses staggered spin current loops. Like the spin Hall insulator, it exhibits helical edge modes, which are protected by the time reversal and/or the U(1) spin rotation around the symmetry-breaking axis. These edge modes conduct heat, and in the presence of a magnetic field produce a thermal Hall conductivity $kappa_{xy}/T$, which increases monotonically with magnetic field. Nonetheless the electric Hall conductance is zero. Like the quantum spin Hall insulator, there should be non-zero spin Hall and quantized two-terminal electrical conductances. The helical edge modes persist in the presence of the Neel order, so long as the latter is not too strong. Upon charge doping the system becomes a metal with Fermi pockets. However, the edge states persist hence their thermal transport properties remain.
Source arXiv, 1905.4248
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