Particle-hole bound states of dipolar molecules in an optical lattice  

作　　者：张义财 汪汉廷 沈顺清 刘伍明 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences [2]Department of Physics and Centre of Theoretical and Computational Physics,The University of Hong Kong

出　　处：《Chinese Physics B》2013年第9期298-304,共7页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China (Grant Nos. 2011CB921502);the National Natural Science Foundation of China (Grant No. 10934010);the Joint Research Projects of the National Natural Science Foundation of China;Hong Kong Research Grant Council (Grant Nos. 11061160490 and N-HKU748/10)

摘　　要：We investigate the particle-hole pair excitations of dipolar molecules in an optical lattice, which can be described with an extended Bose-Hubbard model. For strong enough dipole-dipole interaction, the particle-hole pair excitations can form bound states in one and two dimensions. With decreasing dipole-dipole interaction, the energies of the bound states increase and merge into the particle-hole continuous spectrum gradually. The existence regions, the energy spectra and the wave functions of the bound states are carefully studied and the symmetries of the bound states are analyzed with group theory. For a given dipole-dipole interaction, the number of bound states varies in momentum space and a number distribution of the bound states is illustrated. We also discuss how to observe these bound states in future experiments.We investigate the particle-hole pair excitations of dipolar molecules in an optical lattice, which can be described with an extended Bose-Hubbard model. For strong enough dipole-dipole interaction, the particle-hole pair excitations can form bound states in one and two dimensions. With decreasing dipole-dipole interaction, the energies of the bound states increase and merge into the particle-hole continuous spectrum gradually. The existence regions, the energy spectra and the wave functions of the bound states are carefully studied and the symmetries of the bound states are analyzed with group theory. For a given dipole-dipole interaction, the number of bound states varies in momentum space and a number distribution of the bound states is illustrated. We also discuss how to observe these bound states in future experiments.

关 键 词：particle-hole exications bound states dipolar molecules 

分 类 号：O561[理学—原子与分子物理]