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http://dx.doi.org/10.3807/JOSK.2014.18.6.633

Dynamics of a Bose-Einstein Condensate on Changing Speeds of an Atomchip Trap Potential  

Kim, Seung Jin (Department of Physics Education, Korea National University of Education)
Noh, Jae June (Department of Physics Education, Korea National University of Education)
Kim, Min Seok (Department of Physics Education, Korea National University of Education)
Lee, Jin Seung (Agency for Defense Development)
Yu, Hoon (Department of Physics Education, Korea National University of Education)
Kim, Jung Bog (Department of Physics Education, Korea National University of Education)
Publication Information
Journal of the Optical Society of Korea / v.18, no.6, 2014 , pp. 633-638 More about this Journal
Abstract
We report experimental behaviors of condensed $^{87}Rb$ 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.
Keywords
Collective excitation; Majorana transition; Bose-Einstein condensate; Atomchip;
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Times Cited By KSCI : 1  (Citation Analysis)
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