Spin quantum Hall effects in featureless nonfractionalized spin-1 magnets

Article

关键词: VALENCE-BOND;    STATES;    LIQUIDS;    FIELD;   

DOI  :  10.1103/PhysRevB.89.184417

来源: SCIE

【 摘 要 】

The Affleck-Kennedy-Lieb-Tasaki state (or Haldane phase) in a spin-1 chain represents a large class of gapped topological paramagnets that host symmetry-protected gapless excitations on the boundary. In this work, we show how to realize this type of featureless spin-1 state on a generic two-dimensional lattice. These states have a gapped spectrum in the bulk, but they support gapless edge states protected by spin rotational symmetry along a certain direction, and they exhibit the spin quantum Hall effect. Using a fermion representation of integer spins, we show a concrete example of such spin-1 topological paramagnets on a kagome lattice, and we suggest a microscopic spin-1 Hamiltonian that may realize it.

【 授权许可】

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