Journal article
Signatures of the superfluid to Mott-insulator transition in the excitation spectrum of ultracold atoms
- Abstract:
- We present a detailed analysis of the dynamical response of ultracold bosonic atoms in a one-dimensional optical lattice subjected to a periodic modulation of the lattice depth. Following the experimental realization by Stöferle et al (2004 Phys. Rev. Lett. 92 130403), we study the excitation spectrum of the system as revealed by the response of the total energy as a function of the modulation frequency Ω. By using the Time Evolving Block Decimation algorithm, we are able to simulate one-dimensional systems comparable in size to those in the experiment, with harmonic trapping and across many lattice depths ranging from the Mott-insulator (MI) to the superfluid (SF) regime. Our results produce many of the features seen in the experiment, namely a broad response in the SF regime, and narrow discrete resonances in the MI regime. We identify several signatures of the SF-MI transition that are manifested in the spectrum as it evolves from one limit to the other.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 1.9MB, Terms of use)
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- Publisher copy:
- 10.1088/1367-2630/8/8/160
- Publisher:
- Institute of Physics Publishing Ltd.
- Journal:
- New Journal of Physics More from this journal
- Volume:
- 8
- Issue:
- 8
- Article number:
- 160
- Publication date:
- 2006-08-01
- 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:66d749a7-b41c-439f-8e35-d17c63399641
- Local pid:
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ora:2491
- Deposit date:
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2009-01-09
Terms of use
- Copyright holder:
- IOP Publishing Ltd and Deutsche Physikalische Gesellschaft
- Copyright date:
- 2006
- Notes:
- Citation: Clark, S. R. & Jaksch, D. (2006). 'Signatures of the superfluid to Mott-insulator transition in the excitation spectrum of ultracold atoms', New Journal of Physics, 8(8), 160. [Available at http://www.njp.org]. This is an Open Access article published under the terms of the Creative Commons Attribution-Non-Commercial-Share Alike 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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