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Proposal for a chaotic ratchet using cold atoms in optical lattices

Monteiro, TS; Dando, PA; Hutchings, NAC; Isherwood, MR; (2002) Proposal for a chaotic ratchet using cold atoms in optical lattices. PHYS REV LETT , 89 (19) , Article 194102. 10.1103/PhysRevLett.89.194102. Green open access

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Abstract

We investigate a new type of quantum ratchet which may be realized by cold atoms in a double-well optical lattice, pulsed with unequal periods. The classical dynamics is chaotic and we find the classical diffusion rate D is asymmetric in momentum up to a finite time t(r). The quantum behavior produces a corresponding asymmetry in the momentum distribution which is "frozen-in" by dynamical localization provided the break time t* greater than or equal to t(r). We conclude that the cold atom ratchets require Db/(h) over bar similar to 1, where b is a small deviation from period-one pulses.

Type: Article
Title: Proposal for a chaotic ratchet using cold atoms in optical lattices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.89.194102
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.89.194102
Language: English
Keywords: BROWNIAN MOTORS, QUANTUM, TRANSPORT, LOCALIZATION, SPACE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/9844
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