Spin-Valley Polarized Quantum Anomalous Hall Effect and a Valley-Controlled Half Metal in Bilayer Graphene
arXiv:1911.05980 · doi:10.1103/PhysRevB.101.155425
Abstract
We investigate topological phases of bilayer graphene subject to antiferromagnetic exchange field, interlayer bias, and irradiated by light. We discover that at finite bias and light intensity the system transitions into a previously unknown spin-valley polarized quantum anomalous Hall (SVP-QAH) insulator state, for which the subsystem of one spin is a valley Hall topological insulator (TI) and that of the other spin is a QAH insulator. We assess the TI phases occurring in the system by analytically calculating the spin-valley dependent Chern number, and characterize them by considering edge states in a nanoribbon. We demonstrate that the SVP-QAH edge states lead to a unique spin rectification effect in a domain wall. Along the phase boundary, we observe a bulk half-metal state with Berry's phase of 2π.
arXiv comment6 pages, 3 figures
References in corpus (35)
- Half-Metallic Graphene Nanoribbons
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
- Measurement of the Optical Conductivity of Graphene
- Asymmetry gap in the electronic band structure of bilayer graphene
- Observation of Floquet-Bloch states on the surface of a topological insulator
- The electronic properties of bilayer graphene
- Transport properties of non-equilibrium systems under the application of light: Photo-induced quantum Hall insulators without Landau levels
- Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
- Photo-Induced Topological Phase Transition and a Single Dirac-Cone State in Silicene
- Topological confinement in bilayer graphene
- Topological Phases in Two-Dimensional Materials: A Brief Review
- Spontaneous Quantum Hall States in Chirally-stacked Few-Layer Graphene Systems
- Giant and nonreciprocal second harmonic generation from layered antiferromagnetism in bilayer CrI3
- Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
- Coulomb-driven broken-symmetry states in doubly gated suspended bilayer graphene
- Valley-Polarized Quantum Anomalous-Hall Effects in Silicene
- Strong interfacial exchange field in the graphene/EuS heterostructure
- Transport Spectroscopy of Symmetry-Broken Insulating States in Bilayer Graphene
- Theory of pump-probe photoemission in graphene: Ultrafast tuning of Floquet bands and local pseudospin textures
- Quantum Anomalous Hall Effect in Single-layer and Bilayer Graphene
- Multiterminal Conductance of a Floquet Topological Insulator
- Gate-controlled topological conducting channels in bilayer graphene
- Out of equilibrium electrons and the Hall conductance of a Floquet topological insulator
- Direct imaging of topological edge states at a bilayer graphene domain wall
- Effective Theory of Floquet Topological Transitions
- Two-Dimensional Topological Insulator State and Topological Phase Transition in Bilayer Graphene
- Strong magnetization and Chern insulators in compressed graphene/CrI van der Waals heterostructures
- Van der Waals spin valves
- Tuning Inelastic Light Scattering via Symmetry Control in 2D Magnet CrI
- One-way transport in laser-illuminated bilayer graphene: A Floquet isolator
- Controlling the layer localization of gapless states in bilayer graphene with a gate voltage
- Spontaneous Layer-Pseudospin Domain Walls in Bilayer Graphene
- Valley-Selective Topological Ordered States in Irradiated Bilayer Graphene
- Interplay of Floquet Lifshitz transitions and topological transitions in bilayer Dirac materials
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- Topological Valley Transport of Gapped Dirac Magnons in Bilayer Ferromagnetic Insulators
- Electrically Controllable van der Waals Antiferromagnetic Spin Valve
- Proximity-induced diversified magnetic states and electrically-controllable spin polarization in bilayer graphene: Towards layered spintronics
- Tuning of Bilayer Graphene Heterostructure by Horizontally Incident Circular Polarized Light
- Localized Floquet states in gated bilayer graphene induced by a focused optical beam with orbital angular momentum