Optical excitation of nonlinear spin waves

Details Optical excitation of nonlinear spin waves Optical excitation of nonlinear spin waves

2010-07-25

arxiv.org/abs/1007.4339v2

Physics

Condensed Matter

Quantum Gases

11 pages, 5 figures

Scientific paper

We demonstrate a technique for exciting spin waves in an ultracold gas of Rb-87 atoms based on tunable AC Stark potentials. This technique allows us to excite normal modes of spin waves with arbitrary amplitudes in the trapped gas, including dipole, quadrupole, octupole, and hexadecapole modes. These modes exhibit strong nonlinearities, which manifest as amplitude dependence of the excitation frequencies and departure from sinusoidal behavior. Our results are in good agreement with a full treatment of a quantum Boltzmann transport equation.

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