超冷玻色原子气体向光晶格装载过程分析  

Investigation of the Loading Procedure of Ultra-cold Atomic Gases into an Optical Lattice

作　　者：肖菲[1] 王文新[1] 胡松青[1] 

机构地区：[1]中国石油大学(华东)物理科学与技术学院,山东东营257061

出　　处：《青岛科技大学学报（自然科学版）》2010年第3期327-330,共4页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：中国石油大学(华东)校科研基金项目(LW0818001;Y031806)

摘　　要：利用热力学统计的方法,研究了超冷玻色原子气体向光晶格装载过程中体系的热力学性质,研究发现:当T/Tc为常数时,谐振势阱中基态占据率比光晶格中的大,凝聚体系更加稳定;凝聚体的内能U与Tα+1成正比,定容热容量CV与Tα成正比;超冷玻色原子气体向光晶格缓慢绝热装载过程中,体系的熵保持不变;当T/Tc小于0.30时,随着加载强度的增大,基态占据率变大,体系越稳定,然而,当T/Tc大于0.70时,随着加载强度的增大,玻色体系变得不稳定了。The thermodynamic properties of ultra-cold atomic gases during the loading procedure into optical lattices from the harmonic oscillating trap are researched.The results show that： When the T/Tc equals constant,the occupation rate of particles on the ground state in the harmonic oscillating trap is higher than that of in optical lattices,and the condensate is more stable in the harmonic oscillating trap.The internal energy of the condensate U is in proportion to Tα＋1,and the specific heat C V is in proportion to Tα.The entropy of systems keeps balance during the loading process of the ultra-cold atomic gases slowly and adiabatically loaded into optical lattices from the harmonic oscillating trap.When T/Tc is less than 0.30,the occupation rate of particles on the ground state becomes higher with the loading intensity of the optical lattices increasing,and the Bose system becomes more stable.However,When T/Tc is greater than 0.70,the Bose system becomes unstable with the loading intensity of the optical lattices increasing.

关 键 词：玻色-爱因斯坦凝聚 光晶格 谐振势阱 热力学性质 

分 类 号：O530[理学—等离子体物理]