Non-Fermi-liquid regime of a doped Mott insulator

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    2-DIMENSIONAL HUBBARD-MODEL;    MEAN-FIELD THEORY;    NORMAL-STATE;    MAGNETIC FLUCTUATIONS;    THIN-FILMS;    LA2-XSRXCUO4;    TRANSITION;    METAL;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.59.5341

来源: SCIE

【 摘 要 】

We study the doping of a Mott insulator in the presence of quenched frustrating disorder in the magnitude and sign of the magnetic exchange. Two quite different doping regimes delta< delta* and delta> delta* are found, with delta* similar or equal to J/t (J is the characteristic magnitude of the exchange, and t the hopping amplitude). In the high-doping regime, a (Brinkman-Rice) Fermi-liquid description applies with a coherence scale of order delta t. In the low-doping regime, local magnetic correlations strongly affect the formation of quasiparticles, resulting in a very low coherence scale epsilon(F)(*) similar or equal to J(delta/ delta*)(2). Fermi-liquid behavior does apply below epsilon(F)(*), but a quantum-critical regime epsilon(F)(*)

【 授权许可】

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