Quantized vortex states of strongly interacting bosons in a rotating optical lattice

Journal Article · Fri Dec 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.063606· OSTI ID:20976520

Bhat, Rajiv; Peden, B M; Seaman, B T; Kraemer, M; Holland, M J ^[1]; Carr, L D ^[2]

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1. JILA, NIST and Department of Physics, University of Colorado at Boulder, Colorado 80309-0440 (United States)
2. Physics Department, Colorado School of Mines, Golden, Colorado 80401 (United States)

Bose gases in rotating optical lattices combine two important topics in quantum physics: superfluid rotation and strong correlations. In this paper, we examine square two-dimensional systems at zero temperature comprised of strongly repulsive bosons with filling factors of up to one atom per lattice site. The entry of vortices into the system is characterized by jumps of 2{pi} in the phase winding of the condensate wave function. A lattice of size LxL can have at most L-1 quantized vortices in the lowest Bloch band. In contrast to homogeneous systems, angular momentum is not a good quantum number since the continuous rotational symmetry is broken by the lattice. Instead, a quasiangular momentum captures the discrete rotational symmetry of the system. Energy level crossings indicative of quantum phase transitions are observed when the quasiangular momentum of the ground state changes.

• OSTI ID: 20976520
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANGULAR MOMENTUM
ATOMS
BOSE-EINSTEIN GAS
BOSONS
CAPTURE
CONDENSATES
CORRELATIONS
GROUND STATES
INTERACTING BOSON MODEL
OPTICAL MODELS
PHASE TRANSFORMATIONS
QUANTUM MECHANICS
ROTATION
SUPERFLUIDITY
SYMMETRY
SYMMETRY BREAKING
TWO-DIMENSIONAL CALCULATIONS
VORTICES
WAVE FUNCTIONS