39 citations · 150 across the 18 of their papers we have counts for
19 papers
BCS states and D-wave condensates in the 2D Hubbard model
Kazue Matsuyama, Jeff Greensite
We consider states of BCS form in the 2D Hubbard model which, starting from some arbitrary point in state space in the neighborhood of a Hartree-Fock ground state, are relaxed with…
A Variational Improvement of the Hartree-Fock Approach to the 2D Hubbard Model
Kazue Matsuyama, Jeff Greensite
We consider a refinement of the usual Hartree-Fock method applied to the 2D Hubbard model, in Nambu spinor formulation. The new element is the addition of a "condensate inducing" t…
Hartree-Fock with Nambu spinors, and d-wave condensation in the 2D Hubbard model
Kazue Matsuyama, Jeff Greensite
The usual Hartree-Fock approximation to the Hubbard model is based on eigenstates of the electron number operator. But this formulation is not unique. A different (and inequivalent…
Quantum excitations of static charges in the Ginzburg-Landau model of superconductivity
Jeff Greensite, Kazue Matsuyama
We point out that in superconductors there may exist localized quantum excitations of the electric and condensate fields surrounding a static charge, which cannot be interpreted as…
Multiplicity, localization, and domains in the Hartree-Fock ground state of the two-dimensional Hubbard model
Kazue Matsuyama, Jeff Greensite
We explore certain properties of the Hartree-Fock approximation to the ground state of the two-dimensional Hubbard model, emphasizing the fact that in the Hartree approach there is…
Symmetry, Confinement, and the Higgs Phase
Jeff Greensite, Kazue Matsuyama
We show that the Higgs and confinement phases of a gauge Higgs theory, with the Higgs field in the fundamental representation of the gauge group, are distinguished both by a broken…
Excitations of static isolated fermions in the Higgs phase of gauge Higgs theory
Kazue Matsuyama, Jeff Greensite
A spectrum of localized excitations of isolated static fermions has been discovered in several different gauge Higgs theories. In lattice numerical simulations, we show that the ch…
Excitations of isolated static charges in q=2 Abelian Higgs theory
Kazue Matsuyama
In this report, I discuss lattice Monte Carlo evidence of excitations of isolated static charges in q=2 Abelian Higgs theory. The localized excitations are excited states of the in…
Excitations of isolated static charges in the charge abelian Higgs model
Kazue Matsuyama
We present lattice Monte Carlo evidence of stable excitations of isolated static charges in the Higgs phase of the charge abelian Higgs model. These localized excitations are…
Loss of ergodicity in a quantum hopping model of a dense many body system with repulsive interactions
Kazue Matsuyama
In this work we report on a loss of ergodicity in a simple hopping model, motivated by the Hubbard Hamiltonian, of a many body quantum system at zero temperature, quantized in Eucl…
The Higgs phase as a spin glass, and the transition between varieties of confinement
Jeff Greensite, Kazue Matsuyama
We propose that the Higgs phase of a gauge Higgs theory is the phase of spontaneously broken custodial symmetry, and present a new gauge invariant order parameter for custodial sym…
The nature of symmetry breaking in the superconducting ground state
Kazue Matsuyama, Jeff Greensite
The order parameters which are thought to detect U(1) gauge symmetry breaking in a superconductor are both non-local and gauge dependent. For that reason they are also ambiguous as…
On the distinction between color confinement, and confinement
Jeff Greensite, Kazue Matsuyama
The property of color confinement ("C confinement"), meaning that all asymptotic particle states are color neutral, holds not only in QCD, but also in gauge-Higgs theories deep in…
Cuprates and center vortices: A QCD confinement mechanism in a high-Tc context
Jeff Greensite, Kazue Matsuyama
It is suggested that the center vortex confinement mechanism, familiar in hadronic physics, may have some relevance to high-T phenomena. We focus specifically on the tra…
What symmetry is actually broken in the Higgs phase of a gauge-Higgs theory?
Jeff Greensite, Kazue Matsuyama
In SU() gauge-Higgs theories, with a single Higgs field in the fundamental representation, there exists in addition to the local gauge symmetry a global SU(2) symmetry, at …
A confinement criterion for gauge theories with matter fields
Jeff Greensite, Kazue Matsuyama
A generalization of the Wilson loop area-law criterion is proposed, which is applicable to gauge theories with matter in the fundamental representation of the gauge group. This new…
Origin of Kinks in Energy Dispersion of Strongly Correlated Matter
Kazue Matsuyama, Edward Perepelisky, B Sriram Shastry
We investigate the origin of ubiquitous low energy kinks found in Angle Resolved Photoemission (ARPES) experiments in a variety of correlated matter. Such kinks are unexpected from…
A simple phenomenological model for describing the normal state single particle spectral function of high temperature superconductors
Kazue Matsuyama, Rohit Dilip, G. -H. Gweon
Describing the normal state single particle spectral function line shapes of high temperature superconductors remains an important goal in condensed matter physics. Recently, we ha…
Phenomenological model for the normal state ARPES line shapes of high temperature superconductors
Kazue Matsuyama, G. -H. Gweon
Fully describing the single particle spectral function observed for high temperature superconduc- tors in the normal state is an important goal, yet unachieved. Here, we present a…