Quantum phases of ultracold bosonic atoms in a one-dimensional optical superlattice

Journal Article · Sun May 15 04:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.053621· OSTI ID:21546834

Dhar, Arya; Mishra, Tapan; Pai, Ramesh V; Das, B P ^[1]

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1. Indian Institute of Astrophysics, II Block, Koramangala, Bangalore 560 034 (India)

We analyze various quantum phases of ultracold bosonic atoms in a periodic one-dimensional optical superlattice. Our studies have been performed using the finite-size density-matrix renormalization group method in the framework of the Bose-Hubbard model. Calculations have been carried out for a wide range of densities and the energy shifts due to the superlattice potential. At commensurate fillings, we find the Mott insulator and the superfluid phases as well as Mott insulators induced by the superlattice. At a particular incommensurate density, the system is found to be in the superfluid phase coexisting with density oscillations for a certain range of parameters of the system.

• OSTI ID: 21546834
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 83; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
BOSONS
CRYSTAL MODELS
DENSITY MATRIX
HUBBARD MODEL
MATHEMATICAL MODELS
MATRICES
ONE-DIMENSIONAL CALCULATIONS
OSCILLATIONS
PERIODICITY
PHASE SHIFT
POTENTIALS
QUANTUM STATES
RENORMALIZATION
SUPERFLUIDITY
SUPERLATTICES
VARIATIONS