Excited quantum Hall effect: enantiomorphic flat bands in a Yin-Yang Kagome lattice
arXiv:1908.03689 · doi:10.1088/1361-6528/ac7a4b
Abstract
Quantum Hall effect (QHE) is one of the most fruitful research topics in condensed-matter physics. Ordinarily, the QHE manifests in a ground state with time-reversal symmetry broken by magnetization to carry a quantized chiral edge conductivity around a two-dimensional insulating bulk. We propose a theoretical concept and model of non-equilibrium excited-state QHE (EQHE) without intrinsic magnetization. It arises from circularly polarized photoexcitation between two enantiomorphic flat bands of opposite chirality, each supporting originally a helical topological insulating state hosted in a Yin-Yang Kagome lattice. The chirality of its edge state can be reversed by the handedness of light, instead of the direction of magnetization as in the conventional quantum (anomalous) Hall effect, offering a simple switching mechanism for quantum devices. Implications and realization of EQHE in real materials are discussed.
References in corpus (32)
- Quantum entanglement
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Quantum Spin Hall Effect in Graphene
- Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
- Quantum Spin Hall Insulator State in HgTe Quantum Wells
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
- Valley contrasting physics in graphene: magnetic moment and topological transport
- Valley filter and valley valve in graphene
- High temperature fractional quantum Hall states
- Valley Dependent Optoelectronics from Inversion Symmetry Breaking
- Acoustic higher-order topological insulator on a Kagome lattice
- Spin Anisotropy and Quantum Hall Effect in the Kagome Lattice - Chiral Spin State based on a Ferromagnet-
- Quantum Spin Hall Effect and Topologically Invariant Chern Numbers
- Topological insulator on the kagome lattice
- Flat bands and Wigner crystallization in the honeycomb optical lattice
- Ultracold Atoms in a Tunable Optical Kagome Lattice
- Time-reversal symmetry breaking in circuit-QED based photon lattices
- An exact chiral spin liquid with non-Abelian anyons
- Exotic electronic states in the world of flat bands: from theory to material
- Interaction-driven topological insulators on the kagome and the decorated honeycomb lattices
- The -orbital counterpart of graphene: cold atoms in the honeycomb optical lattice
- Detection of valley polarization in graphene by a superconducting contact
- Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
- Flat-Bands-Enabled Triplet Excitonic Insulator in a Di-atomic Kagome Lattice
- Topological Insulators on the Decorated Honeycomb Lattice
- Superconductivity in repulsively interacting fermions on a diamond chain: flat-band induced pairing
- Optical Kagome lattice for ultra-cold atoms with nearest neighbor interactions
- Exact Diagonalization for Magic-Angle Twisted Bilayer Graphene
- Gate-Tunable Fractional Chern Insulators in Twisted Double Bilayer Graphene
- Quantum anomalous Hall effect on star lattice with spin-orbit coupling and exchange field
- Incidence of Quantum Confinement on Dark Triplet Excitons in Carbon Nanotubes
Cited by in corpus (6)
- Excitonic Condensate in Flat Valence and Conduction Bands of Opposite Chirality
- Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
- Optical properties of two dimensional Dirac Weyl materials with a flatband
- Anomalous Bilayer Quantum Hall Effect
- Non-Abelian line graph: A generalized approach to flat bands
- Fractional spin Josephson effect in topological spin superconductors