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oai:docta.ucm.es:20.500.14352/447312024-09-03T15:28:42Zcom_20.500.14352_14col_20.500.14352_15

Weakly driven quantum coherent ratchets in cold-atom systems Heimsoth, M. Creffield, Charles Sols Lucía, Fernando 538.9 Brownian motors Transport Física de materiales Física del estado sólido 2211 Física del Estado Sólido ©2010 The American Physical Society. This work was supported by MICINN (Spain), through Grant No. FIS-2007-65723 and the Ramón y Cajal Program (CEC). We present an analytical study of the response of cold atoms in an optical lattice to a weak time- and space-asymmetric periodic driving signal. In the noninteracting limit, and for a finite set of resonant frequencies, we show how a coherent, long-lasting ratchet current results from the interference between first- and second-order processes. In those cases, a suitable three- level model can account for the entire dynamics, yielding surprisingly good agreement with numerically exact results for weak and moderately strong driving. MICINN, Spain Ramón y Cajal Program (CEC) Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2023-06-20T03:57:47Z 2023-06-20T03:57:47Z 2010-08-12 journal article https://hdl.handle.net/20.500.14352/44731 1050-2947 10.1103/PhysRevA.82.023607 eng FIS-2007-65723 open access application/pdf American Physical Society