排序方式: 共有41条查询结果,搜索用时 0 毫秒
41.
HAN Jiu-Rong ZHANG Hai-Chao WANG Yu-Zhu 《理论物理通讯》2005,44(5):863-866
We investigate the energy spectrum of ground state and quasi-particle excitation spectrum of hard-core bosons, which behave very much like spinless noninteracting ferrnions, in optical lattices by means of the perturbation expansion and Bogoliubov approach. The results show that the energy spectrum has a single band structure, and the energy is lower near zero momentum; the excitation spectrum gives corresponding energy gap, and the system is in Mort-insulating state at Tonks limit. The analytic result of energy spectrum is in good agreement with that calculated in terms of Green's function at strong correlation limit. 相似文献