Negative longitudinal magnetoresistance from anomalous N=0 Landau level in topological materials

Abstract

Negative longitudinal magnetoresistance (NLMR) is shown to occur in topological materials in the extreme quantum limit, when a magnetic field is applied parallel to the excitation current. We perform pulsed and DC field measurements on Pb1-xSnxSe epilayers where the topological state can be chemically tuned. The NLMR is observed in the topological state, but is suppressed and becomes positive when the system becomes trivial. In a topological material, the lowest N=0 conduction Landau level disperses down in energy as a function of increasing magnetic field, while the N=0 valence Landau level disperses upwards. This anomalous behavior is shown to be responsible for the observed NLMR. Our work provides an explanation of the outstanding question of NLMR in topological insulators and establishes this effect as a possible hallmark of bulk conduction in topological matter.

arXiv commentAccepted in Physical Review Letters

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Cited by in corpus (30)

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• Giant anisotropic magnetoresistance and planar Hall effect in the Dirac semimetal Cd3As2
• Negative Magnetoresistance without Chiral Anomaly in Topological Insulators
• Probing the Chiral Anomaly by Planar Hall Effect in Three-dimensional Dirac Semimetal Cd3As2 Nanoplates
• Anomalous thermoelectric effects of ZrTe${}_5$ in and beyond the quantum limit
• Dirac parameters and topological phase diagram of Pb1-xSnxSe from magneto-spectroscopy
• Tunable Dirac interface states in topological superlattices
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• Intrinsic Magnetoresistance in Three-Dimensional Dirac Materials
• Negative magnetoresistance suppressed through topological phase transition in (Cd1-xZnx)3As2 films
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• Large Magnetoresistance in Topological Insulator Candidate TaSe3
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• Spectral analysis of the magneto-optical response in valley polarized Pb${}_{1-x}$Sn${}_x$Se
• Growth and Strain Engineering of Trigonal Te for Topological Quantum Phases in Non-Symmorphic Chiral Crystals