Stability of Two-Component Bose-Einstein Condensates in Bessel Optical Lattices |
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Authors: | CHEN Hai-Jun LI Hao-Cai XUE Ju-Kui |
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Institution: | College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China |
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Abstract: | The stability of the ground state of two-component Bose-Einstein
condensates (BECs) loaded into the central well of an axially
symmetric Bessel lattices (BLs) potential with attractive or
repulsive atoms interactions is studied using the time-dependent
Gross-Pitaevskii equation (GPE). By using the variational method, we
find that stable ground state of two-component BECs can exist in
BLs. The BLs's depth and the intra-species atom interaction play an
important role in the stability of ground state. The collapse of
two-component BECs in BLs is also studied and a collapse condition
for trapped two-component BECs is obtained. It is shown that the
two-component BECs exhibit rich collapse dynamics. That is, the
two-component BECs can collapse in the system with both intra- and
inter-attractive, or with intra-attractive and inter-repulsive, or
with intra-repulsive and inter-attractive atom interactions.
Furthermore, the control of the collapse of the two-component BECs
in BLs is discussed in detail. The stability diagram of the ground
state in parameter space is obtained. The results show that the
collapse of two-component BECs can be controlled by temporal
modulation of the atom interaction. |
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Keywords: | two-component Bose-Einstein condensates Gross-Pitaevskii equation Bessel optical lattice ground state |
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