Michael Ray, Yves C. Martin
Proceedings of SPIE - The International Society for Optical Engineering
The appropriate infinite-wavelength qi→0 and zero-frequency ω→0 limits of the paramagnetic current-current correlation function provide criteria for determining whether a system is insulating, metallic, or superconducting. Here we discuss these criteria for lattice models and present Monte Carlo data for the two-dimensional positive- and negative-U Hubbard models that imply that the ground state of the half-filled positive-U Hubbard model is an insulator, the doped state is a metal, and the negative-U Hubbard model is a superconductor. © 1993 The American Physical Society.
Michael Ray, Yves C. Martin
Proceedings of SPIE - The International Society for Optical Engineering
Frank R. Libsch, Takatoshi Tsujimura
Active Matrix Liquid Crystal Displays Technology and Applications 1997
A. Krol, C.J. Sher, et al.
Surface Science
J.K. Gimzewski, T.A. Jung, et al.
Surface Science