Gate-tunable magnetoresistance in six-septuple-layer MnBi${}_2$Te${}_4$

Abstract

The recently discovered antiferromagnetic topological insulator MnBi${}_2$Te${}_4$ hosts a variety of exotic topological quantum phases such as the axion insulator and Chern insulator states. Here we report systematic gate voltage dependent magneto transport studies in six septuple-layer MnBi${}_2$Te${}_4$. In p-type carrier regime, we observe positive linear magnetoresistance when MnBi${}_2$Te${}_4$ is polarized in the ferromagnetic state by an out-of-plane magnetic field. Whereas in n-type regime, distinct negative magnetoresistance behaviors are observed. The magnetoresistance in both regimes is highly robust against temperature even up to the Néel temperature. Within the antiferromagnetic state, the behavior of magnetoresistance exhibits a transition from negative to positive as applying a gate voltage. The boundaries between different magnetoresistance behaviors in the experimental phase diagram can be explicitly characterized by the gate-voltage-independent magnetic fields that denotes the processes of the spin-flop transition. The rich transport phenomena demonstrate the intricate interplay between topology, magnetism and dimensionality in MnBi${}_2$Te${}_4$.

arXiv comment19 pages, 4 figures

References in corpus (46)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• Topological Materials: Weyl Semimetals
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Titanic Magnetoresistance in WTe2
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
• Prediction and observation of the first antiferromagnetic topological insulator
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
• Magnetoelectric polarizability and axion electrodynamics in crystalline insulators
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Experimental realization of an intrinsic magnetic topological insulator
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Unique thickness-dependent properties of the van der Waals interlayer antiferromagnet $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$ films
• Non-saturating magnetoresistance in heavily disordered semiconductors
• Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
• High-Chern-Number and High-Temperature Quantum Hall Effect without Landau Levels
• Realization of the Axion Insulator State in Quantum Anomalous Hall Sandwich Heterostructures
• Chemical Aspects of the Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Two-dimensional Transport Induced Linear Magneto-Resistance in Topological Insulator Bi${}_2$Se${}_3$ Nanoribbons
• Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Classical magnetotransport of inhomogeneous conductors
• Axion Electrodynamics in Topological Materials
• Tailoring tricolor structure of magnetic topological insulator for robust axion insulator
• Intertwined Topological and Magnetic Orders in Atomically Thin Chern Insulator MnBi2Te4
• Magnetically Controllable Topological Quantum Phase Transitions in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Antiferromagnetic Topological Insulator MnBi2Te4: Synthesis and Magnetic properties
• Magnetotransport of single crystalline YSb
• Magnetotransport of single crystalline NbAs
• Electronic states and magnetic response of MnBi2Te4 by scanning tunneling microscopy and spectroscopy
• Coincidence of Superparamagnetism and perfect quantization in the Quantum Anomalous Hall state
• Negative Magnetoresistance in Weyl semimetals NbAs and NbP: Intrinsic Chiral Anomaly and Extrinsic Effects
• Large discrete jumps observed in the transition between Chern states in a ferromagnetic Topological Insulator
• Native Defects in Antiferromagnetic Topological Insulator MnBi${}_2$Te${}_4$
• Evidence for a magnetic-field induced ideal type-II Weyl state in antiferromagnetic topological insulator Mn(Bi1-xSbx)2Te4
• Extreme magnetoresistance and Shubnikov-de Haas oscillations in ferromagnetic DySb
• Surface-induced linear magnetoresistance in antiferromagnetic topological insulator MnBi2Te4
• Butterfly-shaped magnetoresistance in triangular-lattice antiferromagnet Ag${}_2$CrO${}_2$