This paper studies the charge Kondo effect in the (spinless) interacting resonant level model (IRLM) by means of the continuous-time quantum Monte Carlo method. The charge Kondo effect may be relevant to certain Samarium compounds with peculiar heavy-fermion behavior. We use double expansion with respect to Coulomb interaction Uf c and hybridization V. Exact dynamics and thermodynamics of the IRLM are derived numerically for a wide range of Uf c with a given value of V. As Uf c becomes negative, a quantum critical point is found in excellent agreement with a simple scaling formula that deals with V in the lowest-order, and Uf c up to infinite order. As Uf c becomes positive and large, however, exact numerical results deviate from lower order scaling results. In particular, the renormalized hybridization increases monotonically with increasing Uf c in contrast with the scaling theory that suggests another quantum critical point.
- Charge Kondo effect
- Continuous-Time quantum Monte Carlo method
- Dynamical and thermodynamical properties
- Perturbative renormalization
ASJC Scopus subject areas
- Physics and Astronomy(all)