Self-trapping in the two-dimensional Bose-Hubbard model

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Self-trapping in the two-dimensional Bose-Hubbard model

Andrew Jreissaty, Juan Carrasquilla, and Marcos Rigol

Phys. Rev. A 88, 031606(R) – Published 30 September 2013

Abstract

We study the expansion of harmonically trapped bosons in a two-dimensional lattice after suddenly turning off the confining potential. We show that, in the presence of multiple occupancies per lattice site and strong interactions, the system exhibits a clear dynamical separation into slowly and rapidly expanding clouds. We discuss how this effect can be understood within a simple picture by invoking doublons and Bose enhancement. This picture is corroborated by an analysis of the momentum distribution function in the regions with slowly and rapidly expanding bosons.

Received 2 July 2013

DOI:https://doi.org/10.1103/PhysRevA.88.031606

Authors & Affiliations

Andrew Jreissaty^1,2, Juan Carrasquilla², and Marcos Rigol²

¹Department of Physics, Georgetown University, Washington, DC 20057, USA
²Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

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Vol. 88, Iss. 3 — September 2013

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