Spin waves in ultracold quantum gases
The incredibly long coherence times of atomic hyperfine states make
them ideally suited for frequency standards and quantum information processing.
Recent experiments on quantum gases have utilized this cherished trait
of cold atoms for the study of spin waves, a property usually associated
with solid-state materials rather than dilute atomic gases. Researchers
in the Quantum Physics Division of of NIST observed this effect in a gas
of rubidium-87 atoms cooled just above the transition for Bose-Einstein
condensation. On the theory side, we teamed up with them for a detailed
study of the excitation frequencies and damping rates of the collective
spin modes. More recently, we have extended our work to the Bose-condensed
regime, which is an unchartered direction for theory with a wealth of new
physics to be discovered. In parallel with this work, we are also exploring
the effects of internal coherence in a quantum degenerate Fermi gas. In
this poster, I will reveal our latest results on these problems.