期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-08199-2
关键词
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资金
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering
- Department of Energy Basic Energy Sciences [DE-FG02-00-ER45841]
- National Science Foundation [DMR 1709076, MRSEC DMR 1420541]
- Gordon and Betty Moore Foundation [GBMF4420]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- DOE Visiting Faculty Program
- US National Science Foundation [DMR-1808892]
- Fulbright Program
- National Natural Science Foundation of China [61771235, 61727805]
- National Key R&D Program of China [2018YFA0209002]
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.
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