Browsing by Author "Burovski, E."

Now showing 1 - 3 of 3
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    Neel temperature and thermodynamics of the half-filled three-dimensional Hubbard model by diagrammatic determinant Monte Carlo
    Kozik, E.; Burovski, E.; Scarola, Vito W.; Troyer, M. (American Physical Society, 2013-05-03)
    We study the thermodynamics of the three-dimensional Hubbard model at half filling on approach to the Neel transition by means of large-scale unbiased diagrammatic determinant Monte Carlo simulations. We obtain the transition temperature in the strongly correlated regime, as well as the temperature dependence of the energy, entropy, double occupancy, and nearest-neighbor spin correlation function. Our results improve the accuracy of previous unbiased studies and present accurate benchmarks in the ongoing effort to realize the antiferromagnetic state of matter with ultracold atoms in optical lattices.
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    Neel temperature and thermodynamics of the half-filled three-dimensional Hubbard model by diagrammatic determinant Monte Carlo
    Kozik, E.; Burovski, E.; Scarola, Vito W.; Troyer, M. (American Physical Society, 2013-05-03)
    We study thermodynamics of the 3D Hubbard model at half filling on approach to the N´eel transition by means of large-scale unbiased Diagrammatic Determinant Monte Carlo simulations. We obtain the transition temperature in the strongly correlated regime, as well as temperature dependence of energy, entropy, double occupancy, and the nearest-neighbor spin correlation function. Our results improve the accuracy of previous unbiased studies and present accurate benchmarks in the ongoing effort to realize the antiferromagnetic state of matter with ultracold atoms in optical lattices.
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    Quantitative Determination of Temperature in the Approach to Magnetic Order of Ultracold Fermions in an Optical Lattice
    Jordens, R.; Tarruell, L.; Greif, D.; Uehlinger, T.; Strohmaier, N.; Moritz, H.; Esslinger, T.; De Leo, L.; Kollath, C.; Georges, A.; Scarola, Vito W.; Pollet, L.; Burovski, E.; Kozik, E.; Troyer, M. (American Physical Society, 2010-05-07)
    We perform a quantitative simulation of the repulsive Fermi-Hubbard model using an ultracold gas trapped in an optical lattice. The entropy of the system is determined by comparing accurate measurements of the equilibrium double occupancy with theoretical calculations over a wide range of parameters. We demonstrate the applicability of both high-temperature series and dynamical mean-field theory to obtain quantitative agreement with the experimental data. The reliability of the entropy determination is confirmed by a comprehensive analysis of all systematic errors. In the center of the Mott insulating cloud we obtain an entropy per atom as low as 0.77k(B) which is about twice as large as the entropy at the Neel transition. The corresponding temperature depends on the atom number and for small fillings reaches values on the order of the tunneling energy.