04.30.+p Entanglement in phase transitions

Dipolar molecules in optical lattices


T. Sowiński, O. Dutta, P. Hauke, L. Tagliacozzo, M. Lewenstein



We study the extended Bose--Hubbard model describing an ultra-cold gas of dipolar molecules in an optical lattice, taking into account all on-site and nearest-neighbor interactions, including occupation-dependent tunneling and pair tunneling terms. Using exact diagonalization and the multi-scale entanglement renormalization ansatz (MERA), we show that these terms can destroy insulating phases and lead to novel quantum phases. These considerable changes of the phase diagram have to be taken into account in upcoming experiments with dipolar molecules.

Aspects of Entanglement in Quantum Many-Body Systems

2009-03-24 - 2010-03-24

J. W. Clark, H. Habibian, A. D. Mandilara and M. L. Ristig
Foundation of Physics, DOI 10.1007/s10701-010-9467-6 (in press)

Knowledge of the entanglement properties of the wave functions commonly used to describe quantum many-particle systems can enhance our understanding of their correlation structure and provide new insights into quantum phase transitions that are observed experimentally or predicted theoretically.

Quantum magnetism and counterflow supersolidity of up-down bosonic dipoles


C. Trefzger, M. Alloing, C. Menotti, F. Dubin, M. Lewenstein
New Journal of Physics 12, 093008 (2010)

We study a gas of dipolar Bosons confined in a two-dimensional optical lattice. Dipoles are considered to point freely in both up and down directions perpendicular to the lattice plane. This results in a nearest neighbor repulsive (attractive) interaction for aligned (anti-aligned) dipoles. We find regions of parameters where the ground state of the system exhibits insulating phases with either ferromagnetic or anti-ferromagnetic ordering. Evidences for the existence of a novel counterflow supersolid quantum phase are also presented.

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