| 光晶格中超流费米气体的能隙孤子 |
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| 引用本文： | 杨树荣,蔡宏强,漆伟,薛具奎.光晶格中超流费米气体的能隙孤子[J].物理学报,2011,60(6):60304-060304. |
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| 作者姓名： | 杨树荣 蔡宏强 漆伟 薛具奎 |
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| 作者单位： | 西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070 |
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| 基金项目： | 国家自然科学基金(批准号:10774120,10975114)、甘肃省自然科学基金(批准号:1010RJZA012)和西北师范大学科技创新工程基金(批准号:NWNU-KJCXGC-03-17, NWNU-KJCXGC-03-48)资助的课题. |
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| 摘 要： | 研究了一维光晶格中超流费米气体的能隙孤子. 应用平均场理论和超流费米气体的流体动力学模型, 利用变分法得到了在整个跨越区超流费米气体在光晶格中存在带隙孤子的条件, 即原子间的非线性相互作用项与系统化学势以及晶格深度的相互关系. 通过对超流费米气体的基态能隙孤子空间分布的分析与对比, 揭示了在一维情况下超流费米气体能隙孤子的存在并发现超流费米气体能隙孤子在整个跨越区当系统从Bose-Einstein凝聚端跨越到BCS端时孤子存在的条件与孤子空间分布存在明显的差别.
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| 关 键 词： | 超流费米气体 光晶格 能隙孤子 |
| 收稿时间： | 2010-09-19 |
Gap solitons of a superfluid fermion gas in optical lattices |
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| Yang Shu-Rong,Cai Hong-Qiang,Qi Wei,Xue Ju-Kui.Gap solitons of a superfluid fermion gas in optical lattices[J].Acta Physica Sinica,2011,60(6):60304-060304. |
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| Authors: | Yang Shu-Rong Cai Hong-Qiang Qi Wei Xue Ju-Kui |
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| Institution: | Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China |
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| Abstract: | Based on the hydrodynamic model, gap soliton of a superfluid fermion gas in optical lattices was discussed. By using the variational method, the condition for existing gap soliton is obtained. It is found that, when the system crosses from Bose-Eingtein condensation side to the BCS side, the condition for existing gap soliton and the structure of gap soliton are very different. |
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| Keywords: | superfluid Fermi gas optical lattices gap solitons |
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