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.
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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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