Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x

Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x

Abstract Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x is a topological insulator (TI) for $$x \approx 0.03$$ x ≈ 0.03 –0.20. Close to the Topological phase transition at $$x = 0.03$$ x = 0.03 , a magnetic field induced Weyl semi-metal (WSM) state is stabilized due to the splitting of the Dirac cone into two Weyl...

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Autores principales: Amit Vashist, R. K. Gopal, Yogesh Singh
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Publicado: Nature Portfolio 2021
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spelling oai:doaj.org-article:3acdce6581104408a817b41cf6b6b1e92021-12-02T15:26:58ZAnomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x10.1038/s41598-021-87780-02045-2322https://doaj.org/article/3acdce6581104408a817b41cf6b6b1e92021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87780-0https://doaj.org/toc/2045-2322Abstract Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x is a topological insulator (TI) for $$x \approx 0.03$$ x ≈ 0.03 –0.20. Close to the Topological phase transition at $$x = 0.03$$ x = 0.03 , a magnetic field induced Weyl semi-metal (WSM) state is stabilized due to the splitting of the Dirac cone into two Weyl cones of opposite chirality. A signature of the Weyl state is the observation of a Chiral anomaly [negative longitudinal magnetoresistance (LMR)] and a violation of the Ohm’s law (non-linear $$I{-}V$$ I - V ). We report the unexpected discovery of Chiral anomaly-like features in the whole range ( $$x = 0.032, 0.072, 0.16$$ x = 0.032 , 0.072 , 0.16 ) of the TI state. This points to a field induced WSM state in an extended x range and not just near the topological transition at $$x = 0.03$$ x = 0.03 . Surprisingly, the strongest Weyl phase is found at $$x = 0.16$$ x = 0.16 with a non-saturating negative LMR much larger than observed for $$x = 0.03$$ x = 0.03 . The negative LMR vanishes rapidly with increasing angle between B and I. Additionally, non-linear I–V is found for $$x = 0.16$$ x = 0.16 indicating a violation of Ohm’s law. This unexpected observation of a strong Weyl state in the whole TI regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x points to a gap in our understanding of the detailed crystal and electronic structure evolution in this alloy system.Amit VashistR. K. GopalYogesh SinghNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Amit Vashist
R. K. Gopal
Yogesh Singh
Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
description Abstract Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x is a topological insulator (TI) for $$x \approx 0.03$$ x ≈ 0.03 –0.20. Close to the Topological phase transition at $$x = 0.03$$ x = 0.03 , a magnetic field induced Weyl semi-metal (WSM) state is stabilized due to the splitting of the Dirac cone into two Weyl cones of opposite chirality. A signature of the Weyl state is the observation of a Chiral anomaly [negative longitudinal magnetoresistance (LMR)] and a violation of the Ohm’s law (non-linear $$I{-}V$$ I - V ). We report the unexpected discovery of Chiral anomaly-like features in the whole range ( $$x = 0.032, 0.072, 0.16$$ x = 0.032 , 0.072 , 0.16 ) of the TI state. This points to a field induced WSM state in an extended x range and not just near the topological transition at $$x = 0.03$$ x = 0.03 . Surprisingly, the strongest Weyl phase is found at $$x = 0.16$$ x = 0.16 with a non-saturating negative LMR much larger than observed for $$x = 0.03$$ x = 0.03 . The negative LMR vanishes rapidly with increasing angle between B and I. Additionally, non-linear I–V is found for $$x = 0.16$$ x = 0.16 indicating a violation of Ohm’s law. This unexpected observation of a strong Weyl state in the whole TI regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x points to a gap in our understanding of the detailed crystal and electronic structure evolution in this alloy system.
format article
author Amit Vashist
R. K. Gopal
Yogesh Singh
author_facet Amit Vashist
R. K. Gopal
Yogesh Singh
author_sort Amit Vashist
title Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
title_short Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
title_full Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
title_fullStr Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
title_full_unstemmed Anomalous negative longitudinal magnetoresistance and violation of Ohm's law deep in the topological insulating regime in Bi $$_{1-x}$$ 1 - x Sb $$_x$$ x
title_sort anomalous negative longitudinal magnetoresistance and violation of ohm's law deep in the topological insulating regime in bi $$_{1-x}$$ 1 - x sb $$_x$$ x
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/3acdce6581104408a817b41cf6b6b1e9
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AT yogeshsingh anomalousnegativelongitudinalmagnetoresistanceandviolationofohmslawdeepinthetopologicalinsulatingregimeinbi1x1xsbxx
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