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|Title:||Quantum machine using cold atoms||Authors:||Ponomarev, A.V.
|Keywords:||Atoms in optical lattices
|Issue Date:||Nov-2010||Citation:||Ponomarev, A.V., Denisov, S., Hänggi, P. (2010-11). Quantum machine using cold atoms. Journal of Computational and Theoretical Nanoscience 7 (11) : 2441-2447. ScholarBank@NUS Repository. https://doi.org/10.1166/jctn.2010.1631||Abstract:||For a machine to be useful in practice, it preferably has to meet two requirements: namely, (i) to be able to perform work under a load and (ii) its operational regime should ideally not depend on the time at which the machine is switched-on. We devise a minimal setup, consisting of two atoms only, for an ac-driven quantum motor which fulfills both these conditions. Explicitly, the motor consists of two different interacting atoms placed into a ring-shaped periodic optical potential - an optical "bracelet," - resulting from the interference of two counter-propagating Laguerre-Gauss laser beams. This bracelet is additionally threaded by a pulsating magnetic flux. While the first atom plays a role of a quantum "carrier," the second serves as a quantum "starter," which sets off the "carrier" into a steady rotational motion. For fixed zero-momentum initial conditions the asymptotic carrier velocity saturates to a unique, nonzero value which becomes increasingly independent on the starting time with increasing "bracelet"-size. We identify the quantum mechanisms of rectification and demonstrate that our quantum motor is able to perform useful work. Copyright © 2010 American Scientific Publishers.||Source Title:||Journal of Computational and Theoretical Nanoscience||URI:||http://scholarbank.nus.edu.sg/handle/10635/97691||ISSN:||15461955||DOI:||10.1166/jctn.2010.1631|
|Appears in Collections:||Staff Publications|
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