Volume 85, Number 4, February 2009
|Number of page(s)||5|
|Section||Atomic, Molecular and Optical Physics|
|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: firstname.lastname@example.org
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 superfluidtoMott-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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