2016年4月
Laser spectroscopic probing of coexisting superfluid and insulating states of an atomic Bose-Hubbard system
NATURE COMMUNICATIONS
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- 巻
- 7
- 号
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/ncomms11341
- 出版者・発行元
- NATURE PUBLISHING GROUP
A system of ultracold atoms in an optical lattice has been regarded as an ideal quantum simulator for a Hubbard model with extremely high controllability of the system parameters. While making use of the controllability, a comprehensive measurement across the weakly to strongly interacting regimes in the Hubbard model to discuss the quantum many-body state is still limited. Here we observe a great change in the excitation energy spectra across the two regimes in an atomic Bose-Hubbard system by using a spectroscopic technique, which can resolve the site occupancy in the lattice. By quantitatively comparing the observed spectra and numerical simulations based on sum rule relations and a binary fluid treatment under a finite temperature Gutzwiller approximation, we show that the spectra reflect the coexistence of a delocalized superfluid state and a localized insulating state across the two regimes.
- リンク情報
- ID情報
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- DOI : 10.1038/ncomms11341
- ISSN : 2041-1723
- Web of Science ID : WOS:000374564600001