Superfluidity versus Bloch oscillations in confined atomic gases |
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Authors: | Büchler H P Geshkenbein V B Blatter G |
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Institution: | Theoretische Physik, ETH-H?nggerberg, CH-8093 Zürich, Switzerland. |
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Abstract: | We study the superfluid properties of (quasi) one-dimensional bosonic atom gases/liquids in traps with finite geometries in the presence of strong quantum fluctuations. Driving the condensate with a moving defect we find the nucleation rate for phase slips using instanton techniques. While phase slips are quenched in a ring resulting in a superfluid response, they proliferate in a tube geometry where we find Bloch oscillations in the chemical potential. These Bloch oscillations describe the individual tunneling of atoms through the defect and thus are a consequence of particle quantization. |
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