Light-induced nonlinear effects on dispersion relation of ultracold Bose gas
Hu Zheng-Feng (胡正峰)ab, Du Chun-Guang (杜春光)a, Li Shi-Qun (李师群)a
a Key Laboratory for Quantum Information and Measurements of Education Ministry, Department of Physics, Tsinghua University, Beijing 100084, China; b Department of Physics, Nanjing Normal University, Nanjing 210097, China
Abstract We have investigated the optical properties of $\Lambda$-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.
Received: 13 August 2002
Revised: 25 December 2002
Accepted manuscript online:
Fund: 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)
Cite this article:
Hu Zheng-Feng (胡正峰), Du Chun-Guang (杜春光), Li Shi-Qun (李师群) Light-induced nonlinear effects on dispersion relation of ultracold Bose gas 2003 Chinese Physics 12 403
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