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Longitudinal Spin Waves in a Dilute Bose Gas

2002; American Physical Society; Volume: 88; Issue: 23 Linguagem: Inglês

10.1103/physrevlett.88.230405

1092-0145

James E. Williams, Tetsuro Nikuni, Charles W. Clark,

Atomic and Subatomic Physics Research

We present a kinetic theory for a dilute noncondensed Bose gas of two-level atoms that predicts the transient spin segregation observed in a recent experiment. The underlying mechanism driving spin currents in the gas is due to a mean-field effect arising from the quantum interference between the direct and exchange scattering of atoms in different spin states. We numerically solve the spin Boltzmann equation, using a one-dimensional model, and find excellent agreement with experimental data.