Browsing by Subject "Hubbard model"

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  • Greschner, Sebastian; Santos, Luis (College Park, MD : American Physical Society, 2015)
    Raman-assisted hopping may be used to realize the anyon Hubbard model in one-dimensional optical lattices. We propose a feasible scenario that significantly improves the proposal of T. Keilmann et al. [Nat. Commun. 2, 361 ...
  • Frahm, Holger; Korepin, V.E. (College Park (Maryland) : American Physical Society, 1991)
    We present a general method for the calculation of correlation functions in the repulsive one-dimensional Hubbard model at less than half-filling in a magnetic field h. We describe the dependence of the critical exponents ...
  • Frahm, Holger; Korepin, V.E. (College Park (Maryland) : American Physical Society, 1990)
    Using results on the scaling of energies with the size of the system and the principles of conformal quantum field theory, we calculate the asymptotics of correlation functions for the one-dimensional Hubbard model in the ...
  • Eßler, F.H.L.; Frahm, Holger (College Park (Maryland) : American Physical Society, 1999)
    We consider density-density correlations in the one-dimensional Hubbard model at half filling. On intuitive grounds one might expect them to exhibit an exponential decay. However, as has been noted recently, this is not ...
  • Shirakawa, T.; Nishimoto, S.; Ohta, Y.; Fukuyama, H. (Bristol : IOP Publishing Ltd., 2009)
    Finite-size systems of the one-dimensional attractive Hubbard model with random potential are studied as an effective model for doped semiconductor nanotubes. We calculate the binding energy of Cooper pairs and pair ...
  • Kaczmarczyk, J.; Weimer, Hendrik; Lemeshko, Mikhail (Bristol : Institute of Physics Publishing, 2016)
    The Fermi-Hubbard model is one of the key models of condensed matter physics, which holds a potential for explaining the mystery of high-temperature superconductivity. Recent progress in ultracold atoms in optical lattices ...
  • Cardarelli, Lorenzo; Greschner, Sebastian; Santos, Luis (College Park, MD : American Physical Society, 2016)
    We show that a multicolor modulation of the depth of an optical lattice allows for a flexible independent control of correlated hopping, occupation-dependent gauge fields, effective on-site interactions without Feshbach ...
  • Greschner, Sebastian; Santos, Luis; Poletti, D. (College Park, MD : American Physical Society, 2014)
    Recent experiments show that periodic modulations of cold atoms in optical lattices may be used to engineer and explore interesting models. We show that double modulation combining lattice shaking and modulated interactions ...
  • Nakano, K.; Shirakawa, T.; Ohta, Y. (Bristol : IOP Publishing Ltd., 2010)
    The density-matrix renormalization group method is used to study the three-band zigzag ladder model that simulates the electronic state of the t 2g-orbital system of the double string of the edge-shared CrO 6 octahedra in ...
  • Eßler, F.H.L.; Frahm, Holger (College Park (Maryland) : American Physical Society, 1997)
    We study the singularities in x-ray absorption spectra of one-dimensional Hubbard and t-J models. We use boundary conformal field theory and the Bethe ansatz solutions of these models with both periodic and open boundary ...