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Density-dependent synthetic gauge fields using periodically modulated interactions.

S Greschner1, G Sun1, D Poletti2

  • 1Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstrasse 2, DE-30167 Hannover, Germany.

Physical Review Letters
|December 6, 2014
PubMed
Summary
This summary is machine-generated.

We demonstrate how to create density-dependent synthetic gauge fields in optical lattices. These fields influence momentum distribution and can drive quantum phase transitions, leading to novel states like fractional Mott insulators.

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Area of Science:

  • Quantum simulation
  • Atomic physics
  • Condensed matter theory

Background:

  • Synthetic gauge fields offer novel ways to control quantum systems.
  • Optical lattices are powerful platforms for simulating quantum phenomena.

Purpose of the Study:

  • To engineer density-dependent synthetic gauge fields in spin-dependent optical lattices.
  • To investigate the effects of these fields on quantum gas properties and phase transitions.

Main Methods:

  • Combining periodically modulated interactions with Raman-assisted hopping.
  • Utilizing spin-dependent optical lattices to create synthetic gauge fields.

Main Results:

  • Density-dependent shift in momentum distribution.
  • Induction of superfluid-to-Mott insulator transitions.
  • Modification of correlations in the superfluid regime.
  • Emergence of fractional Mott insulator states at vanishing interactions due to interplay between gauge field and sublattice symmetry.

Conclusions:

  • Density-dependent synthetic gauge fields can be experimentally realized.
  • These fields provide a new tool for exploring quantum phases and correlations.
  • The study reveals intriguing quantum phenomena, including fractional Mott insulators.