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29 March 2024
 
  » arxiv » cond-mat/0610198

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Effective Hamiltonian for repulsively bound pairs of particles in a periodic potential
David Petrosyan ; Michael Fleischhauer ; James R. Anglin ; PostScript ; PDF ; Other formats ;
Date 7 Oct 2006
Subject Other
AbstractRecently, Winkler et al. [Nature 441, 853 (2006)] have predicted and observed repulsively bound atom pairs in an optical lattice whose dynamics is well described by the Bose-Hubbard model valid in the tight-binding regime. When the on-site repulsion between the particles exceeds the single-particle tunneling rate between the neighboring sites of the periodic potential, such dimer states are well localized at single sites and are stable on the time scale on which the energy dissipation in the system can be neglected. Here we derive an effective Hamiltonian for a lattice containing only even number of particles per site. We then find that the interaction between dimers is a nearest-neighbor attraction, which allows for the formation of attractively bound clusters of repulsively bound pairs of particles.
Source arXiv, cond-mat/0610198
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