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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Published on: September 26, 2014

Strongly interacting bosons in a disordered optical lattice.

M White1, M Pasienski, D McKay

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

We observed that disorder suppresses the condensate fraction in Bose-Einstein condensates, affecting both superfluid and Mott-insulator phases. This effect is reversible and depends on tunneling and interaction energies.

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Area of Science:

  • Quantum physics
  • Atomic physics
  • Condensed matter physics

Background:

  • The Bose-Hubbard model describes interacting bosons on a lattice.
  • Disorder is crucial for understanding real-world quantum systems.
  • Bose-Einstein condensates (BECs) provide a platform for simulating quantum models.

Purpose of the Study:

  • To experimentally investigate the disordered Bose-Hubbard model.
  • To measure the impact of controllable disorder on BEC properties.
  • To provide data for refining theories of disordered quantum systems.

Main Methods:

  • Utilizing an atomic Bose-Einstein condensate in a 3D optical lattice.
  • Introducing controllable disorder via an optical speckle field.
  • Precisely measuring the disorder potential and condensate fraction.

Main Results:

  • Observed disorder-induced suppression of condensate fraction.
  • Demonstrated the reversibility of disorder effects.
  • Characterized suppression across superfluid and superfluid-Mott insulator phases.

Conclusions:

  • Disorder significantly impacts BECs in the disordered Bose-Hubbard model.
  • The observed suppression provides key experimental constraints for theoretical models.
  • Reversible suppression highlights the tunability of quantum phases.