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Abstract

Rabi model is a popular model in quantum optics and describes a two-level system coupling to a quantum resonator. The fruitful physics appears when the coupling strength is comparable to the frequency of the resonator. We investigate the Bose gases of Raman induced spin-orbit coupling with an external harmonic trapping. Using the displacement Fock state in quantum optics we seek for an approximate ground state. We find the superposition state of left and right displaced oscillator state with odd parity has lower energy than the displaced state itself. Besides, we study the time evolution of both the momentum and the position of the system at single particle level to demonstrate the Zitterbewegung oscillating characteristics, which present an intuitive physical picture and are in qualitative agreement with the relevant experimental results. The results are useful to study the Rabi model in deep-strong coupling regime, the model that is difficult to realize in today’s experiment based on the high controllability property of laser, and these results are also instructive for the cold atom physics field.

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Authors and contacts

Corresponding author:Wang Yue-Ming,wang_ym@sxu.edu.cn

Funds:Project supported by the Shanxi 1331 KSC and 111 Project, China (Grant Nos. 1331KSC, D18001) and the Natural Science Foundation of Shanxi Province, China (Grant No. 201601D011009).

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Vol. 68, Issue 17 - 2019-09-05

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