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Quantum Phase Transition and Manipulation of Bose Gas in Optical Lattice

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  • UserXuzong Chen (Peking University, Beijing)
  • ClockFriday 22 January 2016, 13:30-15:00
  • HousePhysics East 217.

If you have a question about this talk, please contact Vincent Boyer.

Phase transition is a popular phenomena in nature, while the temperature below the critical temperature, the normal Bose gas would take transition to quantum gas, which behaves as superfluid [1, 2]. For an optical lattice, optical lattice depth is also a parameter which will alter the lattice from superfluid phase to Mott phase [3]. For 1 D optical lattice, there will be BKT phase transition while the temperature decrease from above to bellow the critical temperature. These cases happen at the ground band of optical lattice, for the excited bands, there are more interesting phenomena to be happen such as Bloch oscillation and Bloch-Zener oscillation [4, 5]. We developed several approaches to measure these transitions and manipulation of the phase for transitions [6]. It will be interested if one could to get much low critical temperature, such as pK, we proposed two step cross beam cooling (TSC) [7, 8], which will be demonstrated on the ultracold atom rack which is due to be launched with Chinese space station in 2022. Many challenge phase transition experiments will be implemented in Chinese space station.

References

[1] Xuzong Chen,,Wei Xiong,Yueyang Zhai, Xuguang Yue,Biao Wu, and Hongwei Xiong , Xiaoji Zhou, Journal of Physics: Conference Series 488 (2014) 012026

[2] Xiong, Wei; Zhou, Xiaoji; Yue, Xuguang; Xuzong Chen, New Journal of Physics,Vol.15, 063025 (2013 )

[3] Bo Lu, Thibualt Vogt, Xinxing Liu, Xu Xu, Xiaoji Zhou, Xuzong Chen, Phys. Rev. A 83 , 051608 (2011).

[4] Yueyang Zhai, Xuguang Yue, Yanjiang Wu, Xuzong Chen, Peng Zhang, and Xiaoji Zhou, Phys. Rev. A 87 , 063638 (2013).

[5] Dong Hu, Linxiao Niu, Baoguo Yang, Xuzong Chen, Biao Wu, Hongwei Xiong, and Xiaoji Zhou, Phys. Rev. A 92 , 043614 (2015).

[6] Wei Xiong, Xuguang Yue, Zhongkai Wang, Xiaoji Zhou, and Xuzong Chen, Phys. Rev. A 84 , 043616 (2011).

[7] Lu Wang, Peng Zhang, Xu-Zong Chen and Zhao-Yuan Ma, J. Phys. B: At. Mol. Opt. Phys.46 195302 (2013).

[8] Hepeng Yao, Tian Luan, Chen Li, Yin Zhang, Zhaoyuan Ma, Xuzong Chen, Optics Communications 359 ,123–128(2016)

This talk is part of the Cold Atoms series.

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