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Fermi Surface evolution in cuprates; an angle-resolved photoemission study

机译:费米表面在铜酸盐中的演化;角度分辨光发射研究

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We report angle-resolved photoemission measurements on an insulating CuO_2 plane compounds, Ca_2CuO_2Cl_2. This so-called parent compound to the high-T_c superconductors is a Mott insulator. We observe that the lowest energy feature loses its spectral weight as it crosses the approximate position where band theory predicts the existence of the Fermi surface. Complemented with an analysis from metallic Bi_2Sr_2CaCu_2O_8 (Bi2212), this suggests that the loss of spectral weight is due to the remnants of the non-interacting Fermi surface. Further analysis shows a d-wave-like dispersion along this 'Fermi surface' contour that is destroyed in the insulator.
机译:我们报告了绝缘的CuO_2平面化合物Ca_2CuO_2Cl_2的角度分辨光发射测量结果。高T_c超导体的所谓母体化合物是莫特绝缘子。我们观察到,最低能级特征越过谱带理论预测费米表面存在的近似位置,它就失去了光谱权重。与金属Bi_2Sr_2CaCu_2O_8(Bi2212)的分析相辅相成,这表明光谱权重的损失是由于非相互作用费米表面的残留所致。进一步的分析显示,沿着“费米表面”轮廓的d波状色散在绝缘子中被破坏。

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