Applied Physics B

, Volume 82, Issue 2, pp 217–224 | Cite as

Random on-site interactions versus random potential in ultra cold atoms in optical lattices

  • H. Gimperlein
  • S. Wessel
  • J. Schmiedmayer
  • L. SantosEmail author


We consider the physics of lattice bosons in the presence of either disordered on-site chemical potential or disordered on-site interparticle interactions. By means of analytical results using strong-coupling expansion, and numerical results based on quantum Monte Carlo calculations, we show that important qualitative changes in the zero temperature phase diagram are observed when comparing both cases. Although for both types of disorder superfluid, Mott-insulator and Bose-glass phases may be found, we show that in the case of random interactions the Mott-insulating regions shrink and eventually vanish for any finite disorder strength beyond a sufficiently large filling factor. Furthermore, at low values of the chemical potential both the superfluid and Mott insulator are stable towards the formation of a Bose-glass, leading to a possibly non-trivial tricritical point. We discuss possible experimental realizations of both types of disorder in the context of ultra cold atomic gases in optical lattices.


Optical Lattice Feshbach Resonance Tricritical Point Quantum Monte Carlo Disorder Strength 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • H. Gimperlein
    • 1
  • S. Wessel
    • 1
  • J. Schmiedmayer
    • 2
  • L. Santos
    • 1
    Email author
  1. 1.Institut für Theoretische Physik IIIUniversität StuttgartStuttgartGermany
  2. 2.Physikalisches InstitutUniversität HeidelbergHeidelbergGermany

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