early settlers of dedham, matwo site hubbard model perturbation
Abstract. Abstract The two-site two-electron generalized Hubbard–Holstein model is studied within a perturbation method based on a variational phonon basis obtained through the modified Lang–Firsov (MLF) transformation. Article “Two-site two-electron generalized Hubbard-Holstein model: a perturbation study” Detailed information of the J-GLOBAL is a service based on the concept of Linking, Expanding, and Sparking, linking science and technology information which hitherto stood alone to support the generation of ideas. We apply perturbation theory and cyclic spin permutation formalism to study the lowest energy states of the infinite-repulsion Hubbard model on finite fragments of n-leg ladder rings and show jump-wise behavior of the ground state spin S{sub 0} as a function of fragment parameters. I. Perturbation method and first-order approximation We investigate low-energy excitations of the one-dimensional half-filledSU(4) Hubbard model with an attractive on-site interaction U < 0 using thedensity matrix renormalization group method as well as a perturbation theory.We find that the ground state is a charge density wave state with a long rangeorder. PERTURBATION THEORY AND THE EXCHANGE INTERACTION IN THE ONE-D IMENSIONAL HUBBARD MODEL V .M. Strong-coupling perturbation theory for the extended Bose-Hubbard model M. Iskin1 and J. K. Freericks2 1Joint Quantum Institute, National Institute of Standards and Technology… Functional-derivative study of the Hubbard model. The two-site two-electron generalized Hubbard–Holstein model is studied within a perturbation method based on a variational phonon basis obtained thro… K.A. CHAODepartment of Physics and Measurement Technology, University of LinkOping, LinkOping, Sweden Volume 64A, number 2 PHYSICS LETTERS 12 December 1977. Zharkov In the framework of a diagram technique for Hubbard operators, a perturbation… The ground-state wave function and the energy are found including up to the seventh and eighth order of perturbation, respectively. The ground state is completely incompressible since all the excitationsare gapful. DEGENERATE PERTURBATION THEORY ANDITS APPLICATION TO THE HUBBARD MODEL.
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