Buscar
Mostrando ítems 1-10 de 38
Effective-action approach to dirty bosons in optical lattices
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Física - PPGFCâmpus São Carlos, 2019-02-21)
A system of cold bosonic atoms loaded in an optical lattice potential can undergo a macroscopic phase transition due to quantum fluctuations. As the depth of the lattice potential is increased, the ground state of the ...
Bose-Hubbard model in a ring-shaped optical lattice with high filling factors
(American Physical Society, 2011-07)
The high-barrier quantum tunneling regime of a Bose-Einstein condensate confined in a ring-shaped optical lattice is investigated. By means of a change of basis transformation, connecting the set of "vortex" Bloch states ...
Mean-field phase diagram of the extended Bose-Hubbard model of many-body cavity quantum electrodynamics
(American Physical Society, 2019-04-30)
We investigate the mean-field phase diagram of the Bose-Hubbard model with infinite-range interactions in two dimensions. This model describes ultracold bosonic atoms confined by a twodimensional optical lattice and ...
Ultracold bosons in random lattice potentials
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Física - PPGFCâmpus São Carlos, 2023-04-06)
The Bose-Hubbard model describes short-range interacting spinless bosons on a random lattice. This model is realized in ultracold atomic systems where quantum phase transitions can be observed. When loaded into a deep ...
Density wave propagation in a two-dimensional random dimer potential: From a single to a bipartite square lattice
(American Physical Society, 2020-01)
We study the propagation of a density perturbation in a weakly interacting boson gas confined on a lattice and in the presence of square dimerized impurities. Such a two-dimensional dual random dimer model (2D DRDM), ...
Entanglement and the Mott insulator-superfluid phase transition in bosonic atom chains
(Iop Publishing LtdBristolInglaterra, 2010)
Three-site Bose-Hubbard model subject to atom losses: Boson-pair dissipation channel and failure of the mean-field approach
(Amer Physical SocCollege PkEUA, 2010)