Using off-diagonal confinement as a cooling method
arXiv:1008.5388 · doi:10.1103/PhysRevA.82.063631
Abstract
In a recent letter [Phys. Rev. Lett. 104, 167201 (2010)] we proposed a new confining method for ultracold atoms on optical lattices, based on off-diagonal confinement (ODC). This method was shown to have distinct advantages over the conventional diagonal confinement (DC) that makes use of a trapping potential, including the existence of pure Mott phases and highly populated condensates. In this paper we show that the ODC method can also lead to temperatures that are smaller than with the conventional DC method, depending on the control parameters. We determine these parameters using exact diagonalizations for the hard-core case, then we extend our results to the soft-core case by performing quantum Monte Carlo (QMC) simulations for both DC and ODC systems at fixed temperatures, and analysing the corresponding entropies. We also propose a method for measuring the entropy in QMC simulations.
6 pages, 6 figures
References in corpus (15)
- Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
- A quantum gas microscope - detecting single atoms in a Hubbard regime optical lattice
- Mott Domains of Bosons Confined on Optical Lattices
- Formation of spatial shell structures in the superfluid to Mott insulator transition
- Instabilities in binary mixtures of one-dimensional quantum degenerate gases
- Collisionally Induced Transport in Periodic Potentials
- The Stochastic Green Function (SGF) algorithm
- Directed update for the Stochastic Green Function algorithm
- Finite-temperature properties of hard-core bosons confined on one-dimensional optical lattices
- Finite temperature QMC study of the one-dimensional polarized Fermi gas
- Superfluid and Mott Insulator phases of one-dimensional Bose-Fermi mixtures
- Mott insulators and correlated superfluids in ultracold Bose-Fermi mixtures
- Pure Mott phases in confined ultracold atomic systems
- Isentropes of spin-1 bosons in an optical lattice
- Extracting the Mott gap from energy measurements in trapped atomic gases