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Appearance of Universal Metallic Dispersion in a Doped Mott Insulator

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arxiv 0809.2357 v1 pith:3IJEXKPB submitted 2008-09-13 cond-mat.str-el

Appearance of Universal Metallic Dispersion in a Doped Mott Insulator

S. Sahrakorpi , R.S. Markiewicz , Hsin Lin , M. Lindroos , X. J. Zhou , T. Yoshida , W. L. Yang , T. Kakeshita
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H. Eisaki S. Uchida Seiki Komiya Yoichi Ando F. Zhou Z. X. Zhao T. Sasagawa A. Fujimori Z. Hussain Z.-X. Shen A. Bansil
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keywords dispersioninsulatormottdispmetallicappearanceapproachedbinding
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We have investigated the dispersion renormalization $Z_{disp}$ in La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) over the wide doping range of $x=0.03-0.30$, for binding energies extending to several hundred meV's. Strong correlation effects conspire in such a way that the system exhibits an LDA-like dispersion which essentially `undresses' ($Z_{disp}\to 1$) as the Mott insulator is approached. Our finding that the Mott insulator contains `nascent' or `preformed' metallic states with a vanishing spectral weight offers a challenge to existing theoretical scenarios for cuprates.

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