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Topological Quantum Computing

Spin fluctuations in quantized transport of magnetic topological insulators

arXiv
Authors: Yu-Hang Li, Ran Cheng

Year

2020

Paper ID

20264

Status

Preprint

Abstract Read

~2 min

Abstract Words

97

Citations

N/A

Abstract

In magnetic topological insulators, quantized electronic transport is interwined with spontaneous magnetic ordering, as magnetization controls band gaps, hence band topology, through the exchange interaction. We show that considering the exchange gaps at the mean-field level is inadequate to predict phase transitions between electronic states of distinct topology. Thermal spin fluctuations disturbing the magnetization can act as frozen disorders that strongly scatter electrons, reducing the onset temperature of quantized transport appreciably even in the absence of structural impurities. This effect, which has hitherto been overlooked, provides an alternative explanation of recent experiments on intrinsic magnetic topological insulators.

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  • In magnetic topological insulators, quantized electronic transport is interwined with spontaneous magnetic ordering, as magnetization controls band gaps, hence band topology...

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2010.00570 [2] arXiv https://arxiv.org/abs/2010.00570 [3] Publisher https://arxiv.org/abs/2010.00570

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