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We study the electronic structure of Ca2-xNaxCuO2Cl2 and Bi2Sr2CaCu2O8+dsamples in a wide range of doping, using angle-resolved photoemissionspectroscopy, with emphasis on on the Fermi surface (FS) in the near anti-nodalregion. The "nesting wave vector", i.e., the wave vector that connects twonearly flat pieces of the Fermi surface in the anti-nodal region, reveals auniversal monotonic decrease in magnitude as a function of doping. Comparingour results to the charge order recently observed by scanning tunnelingspectroscopy (STS), we conclude that the FS nesting and the charge orderpattern seen in STS do not have a direct relationship. Therefore,the chargeorder likely arises due to strong correlation physics rather than FS nestingphysics.

Momentum-space electronic structures and charge orders of high-temperature superconductors Ca2-xNaxCuO2Cl2 and Bi2Sr2CaCu2O8+delta