Quantum liquid of repulsively bound pairs of particles in a lattice

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dc.creatorPetrosyan, David
dc.creatorSchmidt, Bernd
dc.creatorAnglin, James R.
dc.creatorFleischhauer, Michael
dc.date2006-10-07
dc.date2008-03-31
dc.date.accessioned2026-07-07T09:29:12Z
dc.date.available2026-07-07T09:29:12Z
dc.descriptionRepulsively 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 -- "dimers" -- 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.
dc.descriptionCorrected dimer energy & references
dc.identifierhttps://arxiv.org/abs/cond-mat/0610198
dc.identifierhttp://arxiv.org/abs/cond-mat/0610198
dc.identifierPhys. Rev. A 76, 033606 (2007)
dc.identifierdoi:10.1103/PhysRevA.76.033606
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/157700
dc.subjectOther Condensed Matter
dc.subjectQuantum Physics
dc.titleQuantum liquid of repulsively bound pairs of particles in a lattice
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