



@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}
}
@article {1302,
	title = {Quantum Phase Transitions and Continuous Observation of Spinor Dynamics  in an Antiferromagnetic Condensate
},
	journal = {Physical Review Letters},
	volume = {102},
	year = {2009},
	month = {2009/3/23},
	abstract = {  Condensates of spin-1 sodium display rich spin dynamics due to the
antiferromagnetic nature of the interactions in this system. We use Faraday
rotation spectroscopy to make a continuous and minimally destructive
measurement of the dynamics over multiple spin oscillations on a single
evolving condensate. This method provides a sharp signature to locate a
magnetically tuned separatrix in phase space which depends on the net
magnetization. We also observe a phase transition from a two- to a
three-component condensate at a low but finite temperature using a
Stern-Gerlach imaging technique. This transition should be preserved as a
zero-temperature quantum phase transition.
},
	doi = {10.1103/PhysRevLett.102.125301},
	url = {http://arxiv.org/abs/0902.3189v1},
	author = {Yingmei Liu and Sebastian Jung and Stephen E. Maxwell and Lincoln D. Turner and Eite Tiesinga and Paul. D. Lett}
}
