Mott-insulator-to-superfluid transition in Bose-Bose mixtures in a two-dimensional lattice
- Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino (Italy)
- Dipartimento di Fisica and CNISM Unita di Ricerca, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino (Italy)
- Institute for Theoretical Atomic, Molecular and Optical Physics, Harvard-Smithsonian Center of Astrophysics, Cambridge, Massachusetts 02138 (United States)
We perform a numeric study (worm algorithm Monte Carlo simulations) of ultracold two-component bosons in two-dimensional optical lattices. We study how the Mott-insulator-to-superfluid transition is affected by the presence of a second superfluid bosonic species. We find that, at fixed interspecies interaction, the upper and lower boundaries of the Mott lobe are differently modified. The lower boundary is strongly renormalized even for relatively low filling factor of the second component and moderate (interspecies) interaction. The upper boundary, instead, is affected only for large enough filling of the second component. Whereas boundaries are renormalized we find evidence of polaron-like excitations. Our results are of interest for current experimental setups.
- OSTI ID:
- 21456934
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strong-coupling expansion for the two-species Bose-Hubbard model
Phase separation in a two-species Bose mixture
Related Subjects
GENERAL PHYSICS
ALGORITHMS
BOSE-EINSTEIN GAS
BOSONS
CALCULATION METHODS
COMPUTERIZED SIMULATION
DISPERSIONS
ENERGY-LEVEL TRANSITIONS
EXCITATION
MATHEMATICAL LOGIC
MIXTURES
MONTE CARLO METHOD
PHASE TRANSFORMATIONS
POLARONS
QUASI PARTICLES
SIMULATION
SUPERFLUIDITY
TWO-DIMENSIONAL CALCULATIONS