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...

Università della Svizzera italiana

The effects of connectivity and culture on foreign direct investment decisions : empirical evidence from the international electricity industry

Wang, Lei ; Lomi, Alessandro (Dir.) ; Larsen, Erik (Codir.)

Thèse de doctorat : Università della Svizzera italiana, 2011 ; 2011ECO008.

With the significant growth in Foreign Direct Investment (FDI) in the past two decades, both investment managers and policy makers are keen to know the factors determining the location of FDI. The eclectic theory, while being the most popular and dominant theories in international investment, failed to fully capture the behavioral dynamics of international investment. For instance, FDI location...