Particle–hole excitation energy for an insulator state of ultracold atoms created non-adiabatically
Particle–hole excitation energy for an insulator state of ultracold atoms created non-adiabatically
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DOI：
10.1088/0953-4075/40/3/007
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发表时间：
2007-02
期刊：
影响因子：
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通讯作者：
Shujuan Liu;H. Xiong;B. Lu;M. Zhan
中科院分区：
文献类型：
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作者：
Shujuan Liu;H. Xiong;B. Lu;M. Zhan
我们考虑了非绝热增加光学晶格深度所产生的超冷原子玻色系统绝缘态的粒子-空穴激发能。我们给出了激发能的解析表达式，发现激发能与通过绝热增加光学晶格深度而产生的普通Mott绝缘态的激发能有很大不同。这种差异在物理上源于绝热或非绝热产生的绝缘态晶格位置中不同的粒子数波动。
We consider the particle–hole excitation energy for the insulator state of an ultracold atomic Bose system created by increasing non-adiabatically the depth of an optical lattice. We give the analytical expression of this excitation energy, and it is found that the excitation energy is quite different from that of the ordinary Mott insulator state created by adiabatically increasing the depth of the optical lattice. This difference physically arises from the different particle-number fluctuations in the lattice sites for the insulator state created adiabatically or non-adiabatically.