Disordered Bose-Einstein condensates in quasi-one-dimensional magnetic microtraps |
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Authors: | Wang Daw-Wei Lukin Mikhail D Demler Eugene |
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Institution: | Physics Department, Harvard University, Cambridge, MA 02138, USA. |
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Abstract: | We analyze the effects of a random magnetic potential in a microfabricated waveguide for ultracold atoms. We find that the shape and position fluctuations of a current carrying wire induce a strong Gaussian correlated random potential with a length scale set by the atom-wire separation. The theory is used to explain quantitatively the observed fragmentation of the Bose-Einstein condensates in atomic waveguides. Furthermore, we show that nonlinear dynamics can be used to provide important insights into the nature of the strongly fragmented condensates. We argue that a quantum phase transition from the superfluid to the insulating Bose glass phase may be reached and detected under the realistic experimental conditions. |
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