TY - JOUR
T1 - Spinor dynamics in an antiferromagnetic spin-1 thermal Bose gas
JF - Physical Review Letters
Y1 - 2013
A1 - Hyewon K. Pechkis
A1 - Jonathan P. Wrubel
A1 - Arne Schwettmann
A1 - Paul F. Griffin
A1 - Ryan Barnett
A1 - Eite Tiesinga
A1 - Paul D. Lett
AB - 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.
VL - 111
UR - http://arxiv.org/abs/1306.4255v1
CP - 2
J1 - Phys. Rev. Lett.
U5 - 10.1103/PhysRevLett.111.025301
ER -
TY - JOUR
T1 - Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates
JF - Physical Review Letters
Y1 - 2009
A1 - Yingmei Liu
A1 - Eduardo Gomez
A1 - Stephen E. Maxwell
A1 - Lincoln D. Turner
A1 - Eite Tiesinga
A1 - Paul D. Lett
AB - 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.
VL - 102
UR - http://arxiv.org/abs/0906.2110v1
CP - 22
J1 - Phys. Rev. Lett.
U5 - 10.1103/PhysRevLett.102.225301
ER -