Appearance of Universal Metallic Dispersion in a Doped Mott Insulator

Abstract

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.

7 pages, 4 figures. PRB 2008 in press

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• Lifshitz quantum phase transitions and Fermi surface transformation with hole doping in high-$T_c$ superconductors
• Curie-like paramagnetism due to incomplete Zhang-Rice singlet formation in La2-xSrxCuO4
• Kinks and waterfalls as signatures of competing order in angle-resolved photoemission spectra of La_{2-x}Sr_xCuO_4
• Magnetism-Enhanced Strong Electron-Phonon Coupling in Infinite-Layer Nickelate
• Elucidation of the origins of HTSC transport behaviour and quantum oscillations
• A different explanation of energy-resolved scanning tunnelling results from (Ca2-xNax)CuO2Cl2 than that suggested by Hanaguri et al (2009)
• A first-principles-based study of the thermodynamics of competing low-energy states in correlated materials: Example of cuprates