Negative Magnetoresistance without Chiral Anomaly in Topological Insulators

Physical Review Letters
Xin DaiHai-Zhou Lu

Abstract

An intriguing phenomenon in topological semimetals and topological insulators is the negative magnetoresistance (MR) observed when a magnetic field is applied along the current direction. A prevailing understanding to the negative MR in topological semimetals is the chiral anomaly, which, however, is not well defined in topological insulators. We calculate the MR of a three-dimensional topological insulator, by using the semiclassical equations of motion, in which the Berry curvature explicitly induces an anomalous velocity and orbital moment. Our theoretical results are in quantitative agreement with the experiments. The negative MR is not sensitive to temperature and increases as the Fermi energy approaches the band edge. The orbital moment and g factors also play important roles in the negative MR. Our results give a reasonable explanation to the negative MR in 3D topological insulators and will be helpful in understanding the anomalous quantum transport in topological states of matter.

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Citations

Nov 24, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Bo WanHai-Zhou Lu
Jan 24, 2020·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Atanu MaityRajarshi Chakrabarti
Oct 10, 2018·Scientific Reports·S NandySumanta Tewari
Jan 19, 2019·Nature Communications·Jing XuWai-Kwong Kwok
Jul 20, 2019·Physical Review Letters·Bo FuShun-Qing Shen
Nov 11, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Reena YadavSudhir Husale
Jun 16, 2021·ACS Applied Materials & Interfaces·Kaixiang ShuChunlai Xue
Oct 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·M N ChenYu Zhou
Oct 15, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ojasvi PalTarun Kanti Ghosh

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