Abstract
We have investigated the sample dependence of the half-integer thermal Hall effect in under a magnetic field tilted from the axis to the axis. We find that the sample with the largest longitudinal thermal conductivity shows the half-integer quantized thermal Hall effect expected in the Kitaev model. On the other hand, the quantized thermal Hall effect was not observed in the samples with smaller . We suggest that suppressing the magnetic scattering effects on the phonon thermal conduction, which broaden the field-induced gap protecting the chiral edge current of the Majorana fermions, is important to observe the quantized thermal Hall effect.
- Received 27 April 2020
- Revised 13 November 2020
- Accepted 23 November 2020
DOI:https://doi.org/10.1103/PhysRevB.102.220404
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