关键词: 玻色?爱因斯坦凝聚, 自旋-轨道耦合, 偶极振荡

Abstract: The author studies the magnetic properties of two-component Bose with interspecies Raman coupling. For the condensate occupying single momentum state, the spin polarization and the spin susceptibility are linear to the condensation momentum and the effective mass respectively. Such universal relations are independent of the coupling strength, Raman detuning and interactions between atoms. With these relations, the dipole oscillation of a Raman coupled condensate in a harmonic trap is described by a classic picture, and the ratios of oscillation amplitudes in momentum space, spin space and coordinate space are obtained analytically in terms of the effective mass and the spin susceptibility. The results about the oscillation amplitudes are also valid for the dipole mode of a meta-stable condensate.

Key words: Bose-Einstein condensation, spin-orbit coupling, dipole oscillation