Metallic Quantized Anomalous Hall Effect without Chiral Edge States
arXiv:2308.05963 · doi:10.1103/PhysRevB.108.L241407
Abstract
The quantum anomalous Hall effect (QAHE) is a topological state of matter with a quantized Hall resistance. It has been observed in some two-dimensional insulating materials such as magnetic topological insulator films and twisted bilayer graphene. These materials are insulating in the bulk, but possess chiral edge states carrying the edge current around the systems. Here we discover a metallic QAHE in a topological insulator film with magnetic sandwich heterostructure, in which the Hall conductance is quantized to , but the longitudinal conductance remains finite. This effect is attributed to the existence of a pair of massless Dirac cones of surface fermions, with each contributing half of the Hall conductance due to quantum anomaly. It is not characterized by a Chern number and not associated to any chiral edge states. Our study offers novel insights into topological transport phenomena and topological metallic states of matter.
arXiv comment6 pages, 4 figures
References in corpus (28)
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- Topological Field Theory of Time-Reversal Invariant Insulators
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBiTe
- Crossover of Three-Dimensional Topological Insulator of Bi2Se3 to the Two-Dimensional Limit
- Prediction and observation of the first antiferromagnetic topological insulator
- Intrinsic magnetic topological insulators in van der Waals layered MnBiTe-family materials
- High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
- Model Hamiltonian for Topological Insulators
- Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
- Experimental realization of an intrinsic magnetic topological insulator
- Quantum Anomalous Hall Effect in Graphene from Rashba and Exchange Effects
- Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
- Scale-Invariant Dissipationless Chiral Transport in Magnetic Topological Insulators beyond the Two-Dimensional Limit
- Massive Dirac fermions and spin physics in an ultrathin film of topological insulator
- Colloquium: Quantum anomalous Hall effect
- Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
- Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
- Intrinsic magnetic topological insulator phases in the Sb doped MnBi2Te4 bulks and thin flakes
- Tuning Chern Number in Quantum Anomalous Hall Insulators
- Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator
- Surface-edge state and half quantized Hall conductance in topological insulators
- Large discrete jumps observed in the transition between Chern states in a ferromagnetic Topological Insulator
- Half-Quantized Hall Effect and Power Law Decay of Edge Current Distribution
- Stepwise quantized surface states and delayed Landau level hybridization in Co cluster-decorated BiSbTeSe2 topological insulator devices
- Survival of the quantum anomalous Hall effect in orbital magnetic fields as a consequence of the parity anomaly
- Half-Quantized Hall Effect at the Parity-Invariant Fermi Surface
- Helical Symmetry Breaking and Quantum Anomaly in Massive Dirac Fermions