Journal article
Transport of strong-coupling polarons in optical lattices
- Abstract:
- We study the transport of ultracold impurity atoms immersed in a Bose-Einstein condensate (BEC) and trapped in a tight optical lattice. Within the strong-coupling regime, we derive an extended Hubbard model describing the dynamics of the impurities in terms of polarons, i.e. impurities dressed by a coherent state of Bogoliubov phonons. Using a generalized master equation based on this microscopic model, we show that inelastic and dissipative phonon scattering results in (i) a crossover from coherent to incoherent transport of impurities with increasing BEC temperature and (ii) the emergence of a net atomic current on the lattice tilt changes from ohmic conductance to negative differential conductance within an experimentally accessible parameter regime. This transition is accurately described by an Esaki-Tsu-type relation with the effective relaxation time of the impurities as a temperature-dependent parameter.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1021.9KB, Terms of use)
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- Publisher copy:
- 10.1088/1367-2630/10/3/033015
- Publisher:
- Institute of Physics Publishing Ltd.
- Journal:
- New Journal of Physics More from this journal
- Volume:
- 10
- Issue:
- 3
- Article number:
- 033015
- Publication date:
- 2008-03-01
- Edition:
- Publisher's version
- DOI:
- EISSN:
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1367-2630
- Language:
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English
- Keywords:
- Subjects:
- UUID:
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uuid:ca6e19f3-d5ca-4f99-acbd-10443bd10a01
- Local pid:
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ora:2485
- Deposit date:
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2009-01-09
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- Copyright holder:
- IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
- Copyright date:
- 2008
- Notes:
- Citation: Bruderer, M., Klein, A., Clark, S. R. & Jaksch, D. (2008). 'Transport of strong-coupling polarons in optical lattices', New Journal of Physics, 10(3), 033015. [Available at http://www.njp.org]. This is an Open Access article published under the terms of the Creative Commons Attribution-Non-Commercial-ShareAlike 2.5 licence (http://creativecommons.org/licenses/by-nc-sa/2.5/deed.en_GB). This licence permits third-party users to copy, distribute and display the published version of the article, and create derivative works, subject to appropriate acknowledgement of the original authors, and provided the article is not used for commercial purposes. If you alter, transform, or build upon this work, you may distribute the resulting work only under a licence identical to this one. For any reuse or distribution, you must make clear to others the licence terms of this work.
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