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.
Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Phys Rev Lett. 2013 Feb 15;110(7):075303. doi: 10.1103/PhysRevLett.110.075303. Epub 2013 Feb 12.
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.
我们研究了一维光学超晶格中具有排斥相互作用的玻色-哈伯德模型的拓扑性质。我们发现，在分数填充下，单组件（双组件）玻色-哈伯德模型的莫特绝缘体态是拓扑绝缘体，其特征是具有非平凡边缘态的非零电荷（或自旋）陈数。对于超冷原子实验，我们表明可以通过测量谐振阱中玻色原子的密度分布来检测拓扑陈数。
