01428nas a2200193 4500008004100000245006800041210006700109260001300176490000800189520085100197100002401048700002501072700002201097700002201119700001801141700001901159700001901178856003701197 2013 eng d00aSpinor dynamics in an antiferromagnetic spin-1 thermal Bose gas0 aSpinor dynamics in an antiferromagnetic spin1 thermal Bose gas c2013/7/90 v1113 a 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.
1 aPechkis, Hyewon, K.1 aWrubel, Jonathan, P.1 aSchwettmann, Arne1 aGriffin, Paul, F.1 aBarnett, Ryan1 aTiesinga, Eite1 aLett, Paul, D. uhttp://arxiv.org/abs/1306.4255v1