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- W2785362912 abstract "Repulsively interacting particles in a periodic potential can form bound composite objects, whose dissociation is suppressed by a band gap. Nearly pure samples of such repulsively bound pairs of cold atoms -- -- have recently been prepared by Winkler et al. [Nature 441, 853 (2006)]. We here derive an effective Hamiltonian for a lattice loaded with dimers only and discuss its implications to the many-body dynamics of the system. We find that the dimer-dimer interaction includes strong on-site repulsion and nearest-neighbor attraction which always dominates over the dimer kinetic energy at low temperatures. The dimers then form incompressible, minimal-surface droplets of a quantum lattice liquid. For low lattice filling, the effective Hamiltonian can be mapped onto the spin-1/2 XXZ model with fixed total magnetization which exhibits a first-order phase transition from the droplet to a gas phase. This opens the door to studying first order phase transitions using highly controllable ultracold atoms." @default.
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- W2785362912 date "2006-10-07" @default.
- W2785362912 modified "2023-09-27" @default.
- W2785362912 title "Effective Hamiltonian for repulsively bound pairs of particles in a periodic potential" @default.
- W2785362912 hasPublicationYear "2006" @default.
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