Search results for "Jaynes–Cummings–Hubbard model"

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Formation of spatial shell structures in the superfluid to Mott insulator transition

2006

International audience; We report on the direct observation of the transition from a compressible superfluid to an incompressible Mott insulator by recording the in-trap density distribution of a Bosonic quantum gas in an optical lattice. Using spatially selective microwave transitions and spin changing collisions, we are able to locally modify the spin state of the trapped quantum gas and record the spatial distribution of lattice sites with different filling factors. As the system evolves from a superfluid to a Mott insulator, we observe the formation of a distinct shell structure, in good agreement with theory.

PhysicsCondensed Matter::Quantum GasesOptical latticeSpin statesCondensed matter physicsMott insulatorFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciences010305 fluids & plasmasMott transitionCondensed Matter - Other Condensed MatterSuperfluidityLattice (order)[PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsMetal–insulator transition010306 general physicsJaynes–Cummings–Hubbard modelOther Condensed Matter (cond-mat.other)
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Orbital-selective Mott Transitions in a Doped Two-band Hubbard Model

2009

We extend previous studies on orbital-selective Mott transitions in the paramagnetic state of the half-filled degenerate two-band Hubbard model to the general doped case, using a high-precision quantum Monte Carlo dynamical mean-field theory solver. For sufficiently strong interactions, orbital-selective Mott transitions as a function of total band filling are clearly visible in the band-specific fillings, quasiparticle weights, double occupancies, and spectra. The results are contrasted with those of single-band models for similar correlation strengths.

PhysicsHubbard modelCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Mott insulatorQuantum Monte CarloFOS: Physical sciencesCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsMott transitionCondensed Matter - Other Condensed MatterCondensed Matter - Strongly Correlated ElectronsQuasiparticleStrongly correlated materialCondensed Matter::Strongly Correlated ElectronsMetal–insulator transitionJaynes–Cummings–Hubbard modelOther Condensed Matter (cond-mat.other)
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