Metastable states of a gas of dipolar bosons in a 2D optical lattice

Year: 2007

Authors: Menotti C., Trefzger C., Lewenstein M.

Autors Affiliation: ICFO – Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain,
CRS BEC-INFM and Dipartimento di Fisica, Universita’ di Trento, I-38050 Povo, Italy;
ICREA and ICFO – Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860 Castelldefels (Barcelona), Spain

Abstract: We investigate the physics of dipolar bosons in a two-dimensional optical lattice. It is known that due to the long-range character of dipole-dipole interaction, the ground state phase diagram of a gas of dipolar bosons in an optical lattice presents novel quantum phases, like checkerboard and supersolid phases. In this Letter, we consider the properties of the system beyond its ground state, finding that it is characterized by a multitude of almost degenerate metastable states, often competing with the ground state. This makes dipolar bosons in a lattice similar to a disordered system and opens possibilities of using them as quantum memories.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 98 (23)      Pages from: 235301-1  to: 235301-4

KeyWords: dipolar atoms; optical lattices; metastable states
DOI: 10.1103/PhysRevLett.98.235301

Citations: 107
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