Non-Fermi Liquid Behavior and Continuously Tunable Resistivity Exponents in the Anderson-Hubbard Model at Finite Temperature

作者:Patel Niravkumar D; Mukherjee Anamitra; Kaushal Nitin; Moreo Adriana; Dagotto Elbio
来源:Physical Review Letters, 2017, 119(8): 086601.
DOI:10.1103/PhysRevLett.119.086601

摘要

We employ a recently developed computational many-body technique to study for the first time the half-filled Anderson-Hubbard model at finite temperature and arbitrary correlation U and disorder V strengths. Interestingly, the narrow zero temperature metallic range induced by disorder from the Mott insulator expands with increasing temperature in a manner resembling a quantum critical point. Our study of the resistivity temperature scaling T-alpha for this metal reveals non-Fermi liquid characteristics. Moreover, a continuous dependence of alpha on U and V from linear to nearly quadratic is observed. We argue that these exotic results arise from a systematic change with U and V of the "effective" disorder, a combination of quenched disorder and intrinsic localized spins.

  • 出版日期2017-8-24