| Light—induced nonlinear effects of dispersion relation of ultracold Bose gas |
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| 引用本文： | 胡正峰,杜春光,李师群.Light—induced nonlinear effects of dispersion relation of ultracold Bose gas[J].中国物理 B,2003,12(4):403-407. |
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| 作者姓名： | 胡正峰 杜春光 李师群 |
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| 作者单位： | (1)Key Laboratory for Quantum Information and Measurements of Education Ministry, Department of Physics, Tsinghua University, Beijing 100084, China; (2)Key Laboratory for Quantum Information and Measurements of Education Ministry, Department of Physics, Tsinghua University, Beijing 100084, China; Department of Physics, Nanjing Normal University, Nanjing 210097, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(Grant No. 19975027) and the State Key Development Program for Basic Research of China(Grant No. 001CB309308) |
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| 摘 要： | We have investigated the optical properties of Λ-configuration ultracold dense Bose gas interacting with two laser pulses, which usually result in electromagnetically induced transparency. With the nonrelativistic quantum electrodynamics and taking into account the atomic dipole－dipole interaction and local field effect, we have derived the Maxwell－Bloch equations of the system. The dispersion relation of an ultracold Bose gas has been obtained and the light-induced nonlinear effects have been analysed. The light-induced nonlinear effects are different from the effects induced by two-body collision of Bose－Einstein condensation atoms which have a frequency shift of transparent window.
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| 关 键 词： | 光子－原子相互作用 非线性 量子压缩现象 光学磁化系数 超冷玻色气体 激光诱导 玻色－爱因斯坦凝聚 |
| 收稿时间： | 2002-08-13 |
Light-induced nonlinear effects on dispersion relation of ultracold Bose gas |
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| Hu Zheng-Feng,Du Chun-Guang and Li Shi-Qun.Light-induced nonlinear effects on dispersion relation of ultracold Bose gas[J].Chinese Physics B,2003,12(4):403-407. |
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| Authors: | Hu Zheng-Feng Du Chun-Guang and Li Shi-Qun |
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| Institution: | Key Laboratory for Quantum Information and Measurements of Education Ministry, Department of Physics, Tsinghua University, Beijing 100084, China; Department of Physics, Nanjing Normal University, Nanjing 210097, China |
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| Abstract: | We have investigated the optical properties of Λ-configuration ultracold dense Bose gas interacting with two laser pulses, which usually result in electromagnetically induced transparency. With the nonrelativistic quantum electrodynamics and taking into account the atomic dipole－dipole interaction and local field effect, we have derived the Maxwell－Bloch equations of the system. The dispersion relation of an ultracold Bose gas has been obtained and the light-induced nonlinear effects have been analysed. The light-induced nonlinear effects are different from the effects induced by two-body collision of Bose－Einstein condensation atoms which have a frequency shift of transparent window. |
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| Keywords: | photon-atom interaction quantum condensation phenomena optical susceptibility Bose systems |
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