@article{cbec37acf6034fd7822ed5c1d600f434,
title = "Negative longitudinal magnetoresistance in gallium arsenide quantum wells",
abstract = "Negative longitudinal magnetoresistances (NLMRs) have been recently observed in a variety of topological materials and often considered to be associated with Weyl fermions that have a defined chirality. Here we report NLMRs in non-Weyl GaAs quantum wells. In the absence of a magnetic field the quantum wells show a transition from semiconducting-like to metallic behaviour with decreasing temperature. We observe pronounced NLMRs up to 9 Tesla at temperatures above the transition and weak NLMRs in low magnetic fields at temperatures close to the transition and below 5 K. The observed NLMRs show various types of magnetic field behaviour resembling those reported in topological materials. We attribute them to microscopic disorder and use a phenomenological three-resistor model to account for their various features. Our results showcase a contribution of microscopic disorder in the occurrence of unusual phenomena. They may stimulate further work on tuning electronic properties via disorder/defect nano-engineering.",
author = "Jing Xu and Ma, {Meng K.} and Maksim Sultanov and Xiao, {Zhi Li} and Wang, {Yong Lei} and Dafei Jin and Lyu, {Yang Yang} and Wei Zhang and Pfeiffer, {Loren N.} and West, {Ken W.} and Baldwin, {Kirk W.} and Mansour Shayegan and Kwok, {Wai Kwong}",
note = "Funding Information: Magnetotransport measurements were supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering. Sample fabrication and characterization were supported by the Department of Energy Basic Energy Sciences (Grant No. DE-FG02-00-ER45841), the National Science Foundation (Grants No. DMR 1709076 and MRSEC DMR 1420541) and the Gordon and Betty Moore Foundation (Grant No. GBMF4420). Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. W.Z. acknowledges support from the DOE Visiting Faculty Program and the US National Science Foundation under Grants No. DMR-1808892. M.S. was supported by the Fulbright Program. Y.-L.W and Y.-Y.L. acknowledge supports by the National Natural Science Foundation of China (61771235 and 61727805) and the National Key R&D Program of China (2018YFA0209002). Publisher Copyright: {\textcopyright} 2019, The Author(s).",
year = "2019",
month = dec,
day = "1",
doi = "10.1038/s41467-018-08199-2",
language = "English (US)",
volume = "10",
journal = "Nature communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}