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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Controllable Majorana Transition in Spinor Bose-Einstein Condensate

Xuzong Chen, Lin Xia, Xu Xu, F. Yang, Wei Xiong, Juntao Li, Qianli Ma, Lin Yi, Xiaoji Zhou, Hong Mei Guo

Published Aug 1, 2007• 0 citations
Publisher

Abstract

Controllable Majorana transition in spinor BEC system has been realized by altering the direction of magnetic field, which can be manipulated by adjusting the turn-off time of the trap coils. In addition, multicomponent pulsed atom laser can also be generated by controllable Majorana transition process.
DOI
10.1109/cleopr.2007.4391553

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The generation of the population oscillation of the multicomponent spinor Bose-Einstein condensate is demonstrated in this paper. We observe and examine the nonsynchronous decreasing processes of the magnetic fields generated between quadrupole coils and Ioffe coils during the switch-off of the quadrupole-Ioffe-configuration trap, which is considered to induce a nonadiabatic transition. Starting from the two-level Schr\"odinger equation, we have done some numerical fitting and derived an analytical expression identical to the results of Majorana and Zener, of which both results well match the experimental data.
The Bose-Einstein condensate (BEC) is created in a magnetic trap in the Quadrupole-Ioffe configuration (QUIC). This kind of trap combines an anti-Helmholtz quadrupole field with an offset field produced by a single coil perpendicular to the quadrupole field axis to suppress Majorana transitions. In the quadrupole trap evaporative cooling is performed by using radio frequency, reaching the phase transition to a BEC in the QUIC trap. By using Time of Flight (TOF) technique, the expansion velocity is measured with and which lead to temperature of and It is roughly around the recoil temperature.
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