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报告内容
摘 要
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The remarkable realization of synthetic
spin-orbit coupling in quantum gases is opening new perspectives in the
study of many-body phenomena with ultracold atoms. In this talk, I
present a perturbation approach to study the phase diagram of Raman
coupled Bose gases at finite temperature. For weak Raman coupling, free
energy is expanded in terms of Raman coupling strength up to the second
order, where the coefficient is determined according to linear response
theory. The equation of state for the stripe phase and the plane-wave
phase are obtained in Popov approximation, and the first order
transition between these two phases is investigated. As temperature
increases, we find the phase boundary bends toward the stripe phase side
in the most temperature region, which implies the ferromagnetic order is
more robust than the crystalline order in presence of thermal
fluctuations. This theoretical result qualitatively agrees with the
recent experimental observation in rubidium atomic gases. A method to
measure Raman susceptibility through the two-photon Bragg scattering
experiment is also discussed.
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