Quantum transport of two-dimensional Dirac fermions in SrMnBi2

Abstract

We report two-dimensional quantum transport in SrMnBi${}_2$ single crystals. The linear energy dispersion leads to the unusual nonsaturated linear magnetoresistance since all Dirac fermions occupy the lowest Landau level in the quantum limit. The transverse magnetoresistance exhibits a crossover at a critical field $B^{\ast }$ from semiclassical weak-field $B^2$ dependence to the high-field linear-field dependence. With increase in the temperature, the critical field $B^{\ast }$ increases and the temperature dependence of $B^{\ast }$ satisfies quadratic behavior which is attributed to the Landau level splitting of the linear energy dispersion. The effective magnetoresistant mobility ${\mu }_{MR}\sim 3400$ cm${}^2$/Vs is derived. Angular dependent magnetoresistance and quantum oscillations suggest dominant two-dimensional (2D) Fermi surfaces. Our results illustrate the dominant 2D Dirac fermion states in SrMnBi${}_2$ and imply that bulk crystals with Bi square nets can be used to study low dimensional electronic transport commonly found in 2D materials like graphene.

5 papges, 4 figures

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Cited by in corpus (70)

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• Nontrivial Berry phase in magnetic BaMnSb2 semimetal
• Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2
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• Route Towards Dirac and Weyl Antiferromagnetic Spintronics
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• Interplay of Dirac electrons and magnetism in AMnBi2 (A=Ca, Sr)
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• Electrodynamic response of type II Weyl semimetals
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• Large magnetoresistance in type-II Weyl semimetal WP${}_2$
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• Dynamics of electric transport in interacting Weyl semimetals
• Observation of Dirac-like band dispersion in LaAgSb${}_2$
• Magnetic mixed valent semimetal EuZnSb${}_2$ with Dirac states in the band structure
• Large linear magnetoresistance in a new Dirac material BaMnBi2
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• Linear magnetoresistance and surface to bulk coupling in topological insulator thin films
• Large magnetothermopower effect in Dirac materials (Sr/Ca)MnBi2
• Observation of topological nodal-line semimetal in YbMnSb2 through optical spectroscopy
• Observation of well-defined quasi-particle over a wide energy range in quasi-2D system
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• Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal
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• Interlayer electronic transport in CaMnBi${}_2$ antiferromagnet
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• Large linear magnetoresistance and magnetothermopower in layered SrZnSb${}_2$
• Prediction of the High Thermoelectric Performance of Pnictogen Dichalcogenide Layered Compounds with Quasi-One-Dimensional Gapped Dirac-like Band Dispersion
• Absence of Dirac states in BaZnBi${}_2$ induced by spin-orbit coupling
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• Magneto-transport and Electronic Structures of BaZnBi${}_2$
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• Electronic band structure and surface states in Dirac semimetal LaAgSb${}_2$
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• Infrared spectroscopic studies of the topological properties in CaMnSb2
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• Topological antiferromagnetic spintronics: Part of a collection of reviews on antiferromagnetic spintronics
• Controlling Magnetic Order, Magnetic Anisotropy, and Band Topology in Semimetals $\mathrm{Sr}(\mathrm{M}{\mathrm{n}}_{0.9}\mathrm{C}{\mathrm{u}}_{0.1})\mathrm{S}{\mathrm{b}}_2$ and $\mathrm{Sr}(\mathrm{M}{\mathrm{n}}_{0.9}\mathrm{Z}{\mathrm{n}}_{0.1})\mathrm{S}{\mathrm{b}}_2$
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• Strong Anisotropy of Dirac Cone in SrMnBi2 and CaMnBi2 Revealed by Angle-Resolved Photoemission Spectroscopy
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