Abstract
We have studied the locomotion track of (87)Rb Bose-Einstein condensate during decompressing the trap into the center of the glass cell in a quadrupole-Ioffe configuration trap. In order to change the position of the BEC, the current in the quadrupole coils is reduced while the current in the Ioffe coil keeps constant. Because of the strongly reduced trap frequencies of the moved trap, the BEC considerably sags down due to the gravity. Thus an inflexion point exists in the process of moving BEC. When rubidium atoms go over the inflexion point, they cannot keep in balance under the gravity and the force provided by a magnetic field, and flow downward and towards Ioffe coil. By utilizing this effect, the trapped atoms with the spin state |F = 2,mF = 1>, which are left over in the BEC, can be separated from the BEC of |F = 2,mF = 2> state.
Highlights
Transport of ultracold atoms gas and the precise control of the position [1] have played a very important role in experiments, for instance, transferring the atoms in double magneto-optical trap [2, 3, 4], loading atoms into cavity for quantum computing [5], observing the dipole oscillations of the harmonically trapped condensates [6] in the presence of the lattice and the construction of interferometer for precision measurement [7]
The QuadrupoleIoffe configuration (QUIC) trap consists of a pair of anti-Helmholtz coils and a third coil in perpendicular orientation, in which the ultracold atoms are close to the Ioffe coil
We report the direct observation of the locomotion track of BEC from their initial position in a QUIC trap to the geometric center of the glass cell
Summary
Transport of ultracold atoms gas and the precise control of the position [1] have played a very important role in experiments, for instance, transferring the atoms in double magneto-optical trap [2, 3, 4], loading atoms into cavity for quantum computing [5], observing the dipole oscillations of the harmonically trapped condensates [6] in the presence of the lattice and the construction of interferometer for precision measurement [7]. It is desirable to transport the sample to a favorable position for some experiments, such as the research of BEC spin dynamics in 3D lattice and the manipulation of cold atoms in the vicinity of Feshbach resonance [14]. This transport of BEC in the QUIC trap can be realized by reducing the current in the quadrupole coils while keeping the current in the Ioffe coil [12, 15]
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