Disorder-enhanced phase coherence in trapped bosons on optical lattices

Abstract

The consequences of disorder on interacting bosons trapped in optical lattices are investigated by quantum Monte Carlo simulations. At small to moderate strengths of potential disorder a unique effect is observed: if there is a Mott plateau at the center of the trap in the clean limit, phase coherence {\it increases} as a result of disorder. The localization effects due to correlation and disorder compete against each other, resulting in a partial delocalization of the particles in the Mott region, which in turn leads to increased phase coherence. In the absence of a Mott plateau, this effect is absent. A detailed analysis of the uniform system without a trap shows that the disordered states participate in a Bose glass phase.

4 pages, 4 figures

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Cited by in corpus (13)

• Strongly interacting bosons in a disordered optical lattice
• Bosons in one-dimensional incommensurate superlattices
• Stochastic Mean-Field Theory: Method and Application to the Disordered Bose-Hubbard Model at Finite Temperature and Speckle Disorder
• Stochastic Mean-Field Theory for the Disordered Bose-Hubbard Model
• Dynamics of Localization Phenomena for Hardcore Bosons in Optical Lattices
• Analytical and numerical study of dirty bosons in a quasi-one-dimensional harmonic trap
• Finite-size effects in Anderson localization of one-dimensional Bose-Einstein condensates
• Strongly interacting bosons in 1D disordered lattice: phase coherence of distorted Mott phases
• Topological Protection of Coherence in Noisy Open Quantum Systems
• On the information entropy of matter-waves in quasi-disorder potentials
• Disorder effects on the quantum coherence of a many-boson system
• Bose condensation of interacting gases in traps with and without optical lattice
• Dynamical localization of interacting ultracold atoms in one-dimensional quasi-periodic potentials