Abstract
Abstract On the basis of the Bogoliubov-de Gennes theory for the two-dimensional extended Hubbard model ( t – t ′– t ″– U – V ), the quasiparticle structure under co-existence of spin-diagonal checkerboard modulation and d -wave superconductivity is studied. I found that a certain kinds of Fermi surface stabilize the double- Q spin diagonal checkerboard and study the quasiparticle modulation. The lowest SDW gap have the inverted LDOS structure on the upside and the downside above Fermi level. The d -wave-like order parameter is necessary to appear the characteristic peaks near Fermi level which are noted in resent STM experiments in Ca 2 x Na x CuO 2 Cl 2 .
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