Quantum Criticality and Incipient Phase Separation in the Thermodynamic Properties of the Hubbard Model - Condensed Matter > Strongly Correlated ElectronsReportar como inadecuado




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Abstract: Transport measurements on the cuprates suggest the presence of a quantumcritical point hiding underneath the superconducting dome near optimal holedoping. We provide numerical evidence in support of this scenario via adynamical cluster quantum Monte Carlo study of the extended two-dimensionalHubbard model. Single particle quantities, such as the spectral function, thequasiparticle weight and the entropy, display a crossover between two distinctground states: a Fermi liquid at low filling and a non-Fermi liquid with apseudogap at high filling. Both states are found to cross over to a marginalFermi-liquid state at higher temperatures. For finite next-nearest-neighborhopping t- we find a classical critical point at temperature T c. Thisclassical critical point is found to be associated with a phase separationtransition between a compressible Mott gas and an incompressible Mott liquidcorresponding to the Fermi liquid and the pseudogap state, respectively. Sincethe critical temperature T c extrapolates to zero as t- vanishes, we concludethat a quantum critical point connects the Fermi-liquid to the pseudogapregion, and that the marginal-Fermi-liquid behavior in its vicinity is theanalogous of the supercritical region in the liquid-gas transition.



Autor: D. Galanakis, E. Khatami, K. Mikelsons, A. Macridin, J. Moreno, D. A. Browne, M. Jarrell

Fuente: https://arxiv.org/







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