,Ground State Property of a One-Dimensional Bose-Hubbard Model Using Time-Evolving Body Decimation

• 作 者: OUYANG Sheng-De LIU Jing XIANG Shao-Hua SONG Ke-Hui
• 机 构: Department of Physics and Information Engineering, Huaihua University, Huaihua 418000“,”Department o
• 出 处: 中国物理快报（英文版）
• 发表日期: 2013年8期

We study the ground state property of the one-dimensional Bose-Hubbard model using an imaginary time evolving body decimation algorithm.The single-particle density matrix is numerically calculated for a Mott insulating system and a superfluid system separately.By plotting the chemical potential versus the filling n =N/L for U/J =20 and U/J =0.1,we identify the Mott gap for U/J =20 in filling n =1.Lastly,we investigate the occupation number of the Bloch state with quasimomentum for a system deep in the Mott phase and in the superfluid phase respectively.The results indicate Bose condensation in the quasimomentum space.