2021/01/21 by Yang-Yang Lyu, Xian-Jing Zhou, Xianjing Zhou +12 · 1 citation
Materials Science · Physics and Astronomy · #Condensed matter physics #Current (fluid) #Electrode #Electron #Fermi gas #Graphene research and applications #Magnetic field #Magnetoresistance #Materials science #Ohmic contact #Optics #Perpendicular #Physics #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.103.035422
published in Physical review. B./Physical review. B 103(3) (American Physical Society)
arxiv created 2021/01/21 · openalex publication_date 2021/01/21 · arxiv updated 2021/01/22 · openalex created_date 2021/02/01 · openalex updated_date 2026/08/06
Negative longitudinal magnetoresistance (NLMR) has been reported in a variety of materials and has attracted extensive attention as an electrotransport hallmark of topological Weyl semimetals. However, its origin is still under debate. Here, we demonstrate that the NLMR in a two-dimensional electron gas can be influenced by the measurement current. While the NLMR persists up to 130 K, its magnitude and magnetic field response become dependent on the applied current below 60 K. The tunable NLMR at low and high currents can be best attributed to quantum interference and disorder scattering effects, respectively. This work uncovers non-Ohmic NLMR in a non-Weyl material and highlights potential effects of the measurement current in elucidating electrotransport phenomena. We also demonstrate that NLMRs can be a valuable phenomenon in revealing the origins of other properties, such as negative MRs in perpendicular magnetic fields.