Abstract
We report experimental behaviors of condensed
<TEX>$^{87}Rb$</TEX> atoms responding to changes in the trap potential
of the atomchip. The two-types of adiabatic and non-adiabatic overall changes were
implemented by changing the ramp-down speed of the chip-wire current, which can
dominantly modify the one-axis magnetic field gradient. Under the adiabatic process,
a pure condensate stayed in the initial spin state and collectively oscillated with
both monopole and dipole modes, while an atomic cloud above the critical temperature
exhibited sound waves in a dense ultracold gas. On the other hand, Bose-Einstein
condensate atoms with non-adiabatic perturbation were split into spatially different
positions by spin states through spin-flip. We investigated the split ratio among
spin states depending on final evaporation frequency. Potential changes, of course,
cause collective oscillations regardless of the changing process.
© 2014 Optical Society of Korea
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