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• W2097210150 abstract "It has been suggested that after being gapped by a small symmetry-breaking field, the Majorana quasiparticles localized on the surface of a class DIII topological insulator will exhibit a thermal Hall effect that arises from a gravitational Chern-Simons term. We critically examine this idea, and argue that the thermogravitational Hall effect is more complicated than its familiar analog. A conventional Hall current is generated by a uniform electric field, but computing the flux from the gravitational Chern-Simons functional shows that gravitational field gradients---i.e., tidal forces---are needed to induce an energy-momentum flow. We relate the resulting surface energy-momentum flux to a domain-wall gravitational anomaly via the Callan-Harvey inflow mechanism. We stress that the gauge invariance of the combined bulk-plus-boundary theory ensures that the current in the domain wall always experiences a ``covariant'' rather than ``consistent'' anomaly. We use this observation to confirm that the tidally induced energy-momentum current exactly accounts for the covariant gravitational anomaly in $(1+1)$-dimensional domain-wall fermions. The same anomaly arises whether we write the Chern-Simons functional in terms of the Christoffel symbol or in terms of the spin connection." @default.
• W2097210150 created "2016-06-24" @default.
• W2097210150 creator A5006338014 @default.
• W2097210150 date "2012-05-03" @default.
• W2097210150 modified "2023-10-16" @default.
• W2097210150 title "Gravitational anomalies and thermal Hall effect in topological insulators" @default.
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• W2097210150 doi "https://doi.org/10.1103/physrevb.85.184503" @default.
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