Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field.

ABSTRACT: Background: Quantum dots connected to larger systems containing a continuum of states like charge reservoirs allow the theoretical study of many-body effects such as the Coulomb blockade and the Kondo effect. Results: Here, we analyze the nonequilibrium Kondo effect and transport phenomena in a quantum dot coupled to pure monolayer graphene electrodes under external magnetic fields for finite on-site Coulomb interaction. The system is described by the pseudogap Anderson Hamiltonian. We use the equation of motion technique to determine the retarded Green's function of the quantum dot. An analytical formula for the Kondo temperature is derived for electron and hole doping of the graphene leads. The Kondo temperature vanishes in the vicinity of the particle-hole symmetry point a

SUBMITTER: Mathe L 

PROVIDER: S-EPMC7006482 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature