81 research outputs found
Pair correlation functions in one-dimensional correlated-hopping models
We investigate ground-state properties of two correlated-hopping electron
models, the Hirsch and the Bariev model. Both models are of recent interest in
the context of hole superconductivity. Applying the Lanczos technique to small
clusters, we numerically determine the binding energy, the spin gaps,
correlation functions, and other properties for various values of the
bond-charge interaction parameter. Our results for small systems indicate that
pairing is favoured in a certain parameter range. However, in contrast to the
Bariev model, superconducting correlations are suppressed in the Hirsch model,
for a bond-charge repulsion larger than a critical value.Comment: 7 pages (LaTeX) + 6 postcript figures in a separate uuencoded fil
Jordan-Wigner fermionization for the one-dimensional Bariev model of three coupled XY chains
The Jordan-Wigner fermionization for the one-dimensional Bariev model of
three coupled XY chains is formulated. The Lax operator in terms of fermion
operators and the quantum R-matrix are presented explicitly. Furthermore, the
graded reflection equations and their solutions are discussed.Comment: 10 pages, no figur
Open t-J chain with boundary impurities
We study integrable boundary conditions for the supersymmetric t-J model of
correlated electrons which arise when combining static scattering potentials
with dynamical impurities carrying an internal degree of freedom. The latter
differ from the bulk sites by allowing for double occupation of the local
orbitals. The spectrum of the resulting Hamiltonians is obtained by means of
the algebraic Bethe Ansatz.Comment: LaTeX2e, 9p
Dual-Path Mechanism for Catalytic Oxidation of Hydrogen on Platinum Surfaces
The catalytic formation of water from adsorbed hydrogen and oxygen atoms on Pt(111) was studied with scanning tunneling microscopy and high resolution electron energy loss spectroscopy. The known complexity of this reaction is explained by the strongly temperature dependent lifetime of the product H2O molecules on the surface. Below the desorption temperature water reacts with unreacted O adatoms to OHad, leading to an autocatalytic process; at higher temperatures sequential addition of H adatoms to Oad with normal kinetics takes place
Integrable variant of the one-dimensional Hubbard model
A new integrable model which is a variant of the one-dimensional Hubbard
model is proposed. The integrability of the model is verified by presenting the
associated quantum R-matrix which satisfies the Yang-Baxter equation. We argue
that the new model possesses the SO(4) algebra symmetry, which contains a
representation of the -pairing SU(2) algebra and a spin SU(2) algebra.
Additionally, the algebraic Bethe ansatz is studied by means of the quantum
inverse scattering method. The spectrum of the Hamiltonian, eigenvectors, as
well as the Bethe ansatz equations, are discussed
A new integrable two parameter model of strongly correlated electrons in one dimension
A new one-dimensional fermion model depending on two independent interaction
parameters is formulated and solved exactly by the Bethe ansatz method. The
Hamiltonian of the model contains the Hubbard interaction and correlated
hopping as well as pair hopping terms. The density-density and pair
correlations are calculated which manifest superconducting properties in
certain regimes of the phase diagram.Comment: 8 pages, latex, 2 postscript figure
New solutions to the Reflection Equation and the projecting method
New integrable boundary conditions for integrable quantum systems can be
constructed by tuning of scattering phases due to reflection at a boundary and
an adjacent impurity and subsequent projection onto sub-spaces. We illustrate
this mechanism by considering a gl(m<n)-impurity attached to an open
gl(n)-invariant quantum chain and a Kondo spin S coupled to the supersymmetric
t-J model.Comment: Latex2e, no figure
Quantum integrability and exact solution of the supersymmetric U model with boundary terms
The quantum integrability is established for the one-dimensional
supersymmetric model with boundary terms by means of the quantum inverse
scattering method. The boundary supersymmetric chain is solved by using the
coordinate space Bethe ansatz technique and Bethe ansatz equations are derived.
This provides us with a basis for computing the finite size corrections to the
low lying energies in the system.Comment: 4 pages, RevTex. Some cosmetic changes. The version to appear in
Phys. Rev.
Thermodynamics of an integrable model for electrons with correlated hopping
A new supersymmetric model for electrons with generalized hopping terms and
Hubbard interaction on a one-dimensional lattice is solved by means of the
Bethe Ansatz. We investigate the phase diagram of this model by studying the
ground state and excitations of the model as a function of the interaction
parameter, electronic density and magnetization. Using arguments from conformal
field theory we can study the critical exponents describing the asymptotic
behaviour of correlation functions at long distances.Comment: 24 pp., latex+epsf, figures include
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