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    Université de Fribourg

    Detecting phase transitions and crossovers in Hubbard models using the fidelity susceptibility

    Huang, Li ; Wang, Yilin ; Wang, Lei ; Werner, Philipp

    In: Physical Review B, 2016, vol. 94, no. 23, p. 235110

    A generalized version of the fidelity susceptibility of single-band and multiorbital Hubbard models is systematically studied using single-site dynamical mean-field theory in combination with a hybridization expansion continuous-time quantum Monte Carlo impurity solver. We find that the fidelity susceptibility is extremely sensitive to changes in the state of the system. It can be used as a...

    Université de Fribourg

    Fidelity susceptibility perspective on the Kondo effect and impurity quantum phase transitions

    Wang, Lei ; Shinaoka, Hiroshi ; Troyer, Matthias

    In: Physical Review Letters, 2015, vol. 115, no. 23, p. 236601

    The Kondo effect is a ubiquitous phenomenon appearing at low temperature in quantum confined systems coupled to a continuous bath. Efforts in understanding and controlling it have triggered important developments across several disciplines of condensed matter physics. A recurring pattern in these studies is that the suppression of the Kondo effect often results in intriguing physical phenomena...