Quantum magnetism and counterflow supersolidity of up-down bosonic dipoles

Year: 2010

Authors: Trefzger C., Alloing M., Menotti C., Dubin F., Lewenstein M.

Autors Affiliation: ICFO Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain;
CNR – Istituto Nazionale di Ottica BEC Center and Dipartimento di Fisica, Universita’ di Trento, 38123 Povo, Italy;
ICREA Institucio Catalana de Recerca i Estudis Avanats, Lluis Companys 23, E-08010 Barcelona, Spain

Abstract: 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 ferromagnetic or anti-ferromagnetic ordering, as well as with rational values of the average magnetization. Evidence for the existence of a novel counterflow supersolid quantum phase is also presented.


Volume: 12      Pages from: 093008  to: 093008

KeyWords: dipolar atoms; quantum magnetisms;
DOI: 10.1088/1367-2630/12/9/093008

Citations: 19
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