dorsal/arxiv
View SchemaShifting the boundaries: pulse-shape effects in the atom-optics kicked rotor
| Authors | P. H. Jones, M. Goonasekera, H. E. Saunders-Singer, D. R. Meacher |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0311120 |
| URL | https://arxiv.org/abs/quant-ph/0311120 |
| DOI | 10.1209/epl/i2004-10198-1 |
Abstract
We present the results of experiments performed on cold caesium in a pulsed sinusoidal optical potential created by counter-propagating laser beams having a small frequency difference in the laboratory frame. Since the atoms, which have average velocity close to zero in the laboratory frame, have non-zero average velocity in the co-moving frame of the optical potential, we are able to centre the initial velocity distribution of the cloud at an arbitrary point in phase-space. In particular, we demonstrate the use of this technique to place the initial velocity distribution in a region of phase-space not accessible to previous experiments, namely beyond the momentum boundaries arising from the finite pulse duration of the potential. We further use the technique to explore the kicked rotor dynamics starting from a region of phase-space where there is a strong velocity dependence of the diffusion constant and quantum break time and demonstrate that this results in a marked asymmetry in the chaotic evolution of the atomic momentum distribution.
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"abstract": "We present the results of experiments performed on cold caesium in a pulsed\nsinusoidal optical potential created by counter-propagating laser beams having\na small frequency difference in the laboratory frame. Since the atoms, which\nhave average velocity close to zero in the laboratory frame, have non-zero\naverage velocity in the co-moving frame of the optical potential, we are able\nto centre the initial velocity distribution of the cloud at an arbitrary point\nin phase-space. In particular, we demonstrate the use of this technique to\nplace the initial velocity distribution in a region of phase-space not\naccessible to previous experiments, namely beyond the momentum boundaries\narising from the finite pulse duration of the potential. We further use the\ntechnique to explore the kicked rotor dynamics starting from a region of\nphase-space where there is a strong velocity dependence of the diffusion\nconstant and quantum break time and demonstrate that this results in a marked\nasymmetry in the chaotic evolution of the atomic momentum distribution.",
"arxiv_id": "quant-ph/0311120",
"authors": [
"P. H. Jones",
"M. Goonasekera",
"H. E. Saunders-Singer",
"D. R. Meacher"
],
"categories": [
"quant-ph"
],
"doi": "10.1209/epl/i2004-10198-1",
"title": "Shifting the boundaries: pulse-shape effects in the atom-optics kicked rotor",
"url": "https://arxiv.org/abs/quant-ph/0311120"
},
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