IDEAS home Printed from https://ideas.repec.org/a/nat/natcom/v7y2016i1d10.1038_ncomms11341.html
   My bibliography  Save this article

Laser spectroscopic probing of coexisting superfluid and insulating states of an atomic Bose–Hubbard system

Author

Listed:
  • Shinya Kato

    (Graduate School of Science, Kyoto University
    Present address: Department of Applied Physics, Waseda University, 3-4-1 Okubo, Tokyo 169-8555, Japan)

  • Kensuke Inaba

    (NTT Basic Research Laboratories, NTT Corporation)

  • Seiji Sugawa

    (Graduate School of Science, Kyoto University
    Present address: Joint Quantum Institute, National Institute of Standards and Technology, University of Maryland, Gaithersburg, Maryland 20899, USA)

  • Kosuke Shibata

    (Graduate School of Science, Kyoto University
    Present address: Department of Physics, Chuo University, Tokyo 112-8551, Japan)

  • Ryuta Yamamoto

    (Graduate School of Science, Kyoto University)

  • Makoto Yamashita

    (NTT Basic Research Laboratories, NTT Corporation)

  • Yoshiro Takahashi

    (Graduate School of Science, Kyoto University)

Abstract

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.

Suggested Citation

  • Shinya Kato & Kensuke Inaba & Seiji Sugawa & Kosuke Shibata & Ryuta Yamamoto & Makoto Yamashita & Yoshiro Takahashi, 2016. "Laser spectroscopic probing of coexisting superfluid and insulating states of an atomic Bose–Hubbard system," Nature Communications, Nature, vol. 7(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11341
    DOI: 10.1038/ncomms11341
    as

    Download full text from publisher

    File URL: https://www.nature.com/articles/ncomms11341
    File Function: Abstract
    Download Restriction: no
    File URL: https://libkey.io/10.1038/ncomms11341?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11341. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Sonal Shukla or Springer Nature Abstracting and Indexing (email available below). General contact details of provider: http://www.nature.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.