While correlated electron behavior is to be expected at oxide interfaces (IFs) involving Mott
insulators, we show how strong correlations in the oxygen 2 p states may be necessary to …

Starting with the three-band extended Hubbard model (or dp model) widely used to
represent the CuO 2 planes in the high-T c cuprates, we make a systematic reduction to an …

Using strong-coupling perturbation theory for the Hubbard model, explicit expressions are
obtained for the integrated weights, energy positions, and widths of the upper and lower …

Inelastic-neutron-scattering experiments have been performed to study the spin-excitation
spectrum in the overdoped regime of the high-T c superconducting system YBa 2 Cu 3 O 6+ …

New experimental and theoretical results on the electronic structure and spectral properties
of quasiparticles in copper oxides are reviewed. It is shown that the electronic structure …

We show that a two-dimensional (2D) metal in a superconducting (SC) state with wave-
vector-dependent gap behaves as a quantum-spin liquid characterized by a collective mode …

The t− J z model is the strongly anisotropic limit of the t− J model which captures some
general properties of doped antiferromagnets (AF's). The absence of spin fluctuations …

A microscopically based Hamiltonian of the generalized tt′-J model is presented. Two
types of the additional t′ terms are discussed. The numerical range of the amplitudes …

Using cluster perturbation theory, we explain the origin of the strongly dispersive feature
found at high binding energy in the spectral function of the Hubbard model. By comparing …

We theoretically analyze the process of charge recombination in the planar Mott-Hubbard
insulators with the aim to explain the short picosecond-range lifetimes of photoexcited …