



@article {1306,
	title = {Spinor dynamics in an antiferromagnetic spin-1 thermal Bose gas},
	journal = {Physical Review Letters},
	volume = {111},
	year = {2013},
	month = {2013/7/9},
	abstract = {  We present experimental observations of coherent spin-population oscillations
in a cold thermal, Bose gas of spin-1 sodium-23 atoms. The population
oscillations in a multi-spatial-mode thermal gas have the same behavior as
those observed in a single-spatial-mode antiferromagnetic spinor Bose Einstein
condensate. We demonstrate this by showing that the two situations are
described by the same dynamical equations, with a factor of two change in the
spin-dependent interaction coefficient, which results from the change to
particles with distinguishable momentum states in the thermal gas. We compare
this theory to the measured spin population evolution after times up to a few
hundreds of ms, finding quantitative agreement with the amplitude and period.
We also measure the damping time of the oscillations as a function of magnetic
field.
},
	doi = {10.1103/PhysRevLett.111.025301},
	url = {http://arxiv.org/abs/1306.4255v1},
	author = {Hyewon K. Pechkis and Jonathan P. Wrubel and Arne Schwettmann and Paul F. Griffin and Ryan Barnett and Eite Tiesinga and Paul D. Lett}
}
@article {1298,
	title = {Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates},
	journal = {Physical Review Letters},
	volume = {102},
	year = {2009},
	month = {2009/6/5},
	abstract = {  We characterize fluctuations in atom number and spin populations in F=1
sodium spinor condensates. We find that the fluctuations enable a quantitative
measure of energy dissipation in the condensate. The time evolution of the
population fluctuations shows a maximum. We interpret this as evidence of a
dissipation-driven separatrix crossing in phase space. For a given initial
state, the critical time to the separatrix crossing is found to depend
exponentially on the magnetic field and linearly on condensate density. This
crossing is confirmed by tracking the energy of the spinor condensate as well
as by Faraday rotation spectroscopy. We also introduce a phenomenological model
that describes the observed dissipation with a single coefficient.
},
	doi = {10.1103/PhysRevLett.102.225301},
	url = {http://arxiv.org/abs/0906.2110v1},
	author = {Yingmei Liu and Eduardo Gomez and Stephen E. Maxwell and Lincoln D. Turner and Eite Tiesinga and Paul D. Lett}
}
