title: Topological Bose-Mott insulators in a one-dimensional optical superlattice.
abstract: We study topological properties of the Bose-Hubbard model with repulsive interactions in a one-dimensional optical superlattice. We find that the Mott insulator states of the single-component (two-component) Bose-Hubbard model under fractional fillings are topological insulators characterized by a nonzero charge (or spin) Chern number with nontrivial edge states. For ultracold atomic experiments, we show that the topological Chern number can be detected through measuring the density profiles of the bosonic atoms in a harmonic trap.
authors.affiliation: National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China and Laboratory of Quantum Information Technology and SPTE, South China Normal University, Guangzhou 510631, China and Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Shi-Liang
authors.initials: SL
authors.lastname: Zhu
authors.affiliation: Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: Z-D
authors.initials: ZD
authors.lastname: Wang
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA and Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: Y-H
authors.initials: YH
authors.lastname: Chan
authors.affiliation: Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA and Center for Quantum Information, IIIS, Tsinghua University, Beijing 100084, China.
authors.forename: L-M
authors.initials: LM
authors.lastname: Duan