Continuous-Time Quantum Monte Carlo Approach to Singlet-Triplet Kondo Systems

Abstract

Dynamical properties are studied numerically for a variant of the Kondo model with singlet and triplet crystalline electric field (CEF) levels where Kondo and CEF singlets compete for the ground state. Using the continuous-time quantum Monte Carlo method, we derive the $t$-matrix of conduction electrons and dynamical susceptibilities of local electrons without encountering the negative sign problem. When the CEF splitting is comparable to the Kondo temperature, the dynamical response has only a quasi-elastic peak. Nevertheless, the local single-particle spectrum shows an energy gap in strong contrast with the ordinary Kondo model.

9 pages, 10 figures

References in corpus (2)

• Hybridization expansion impurity solver: General formulation and application to Kondo lattice and two-orbital models
• Continuous-Time Quantum Monte Carlo Method for the Coqblin-Schrieffer Model

Cited by in corpus (6)

• Spin-boson coupling in continuous-time quantum Monte Carlo
• Dynamical mean-field theory of indirect magnetic exchange
• Itinerant Antiferromagnetism in Infinite Dimensional Kondo Lattice
• Electronic Order with Staggered Kondo and Crystalline Electric Field Singlets
• Electronic Orders Induced by Kondo Effect in Non-Kramers f-Electron Systems
• Distinct effect of Kondo physics on crystal field splitting in electron and spin spectroscopies