| Issue |
EPL
Volume 85, Number 4, February 2009
|
|
|---|---|---|
| Article Number | 43001 | |
| Number of page(s) | 5 | |
| Section | Atomic, Molecular and Optical Physics | |
| DOI | https://doi.org/10.1209/0295-5075/85/43001 | |
| Published online | 18 February 2009 | |
Quantum phase transitions in a dimerized Bose-Hubbard model: A DMRG study
Theoretical Sciences Unit and DST Unit on Nanoscience, Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur Campus - Bangalore 560064, India
Corresponding author: pati@jncasr.ac.in
Received:
14
October
2008
Accepted:
26
January
2009
We investigate the phase diagram of a dimerized Bose-Hubbard model, using a density matrix renormalization group technique. We find a new phase, which is the coexistence of superfluid and bond-wave phases, due to the effect of dimerization. Experimentally dimerization in optical lattice can be realized by using two counterpropagating laser beams of different wavelengths. Apart from the conventional superfluid
toMott-insulator transition, we find a new quantum phase transition: from superfluid-bond-wave to Mott-insulator-bond wave phase. Our study suggests a rich phase diagram which can be easily probed.
PACS: 37.10.Jk – Atoms in optical lattices / 05.30.Jp – Boson systems
© EPLA, 2009
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