Ferromagnetic induced Kondo effect in graphene with a magnetic impurity
arXiv:2006.13582 · doi:10.1103/PhysRevB.100.115115
Abstract
We investigate the many-body effects of a magnetic adatom in ferromagnetic graphene by using the numerical renormalization group method. The nontrivial band dispersion of ferromagnetic graphene gives rise to interesting Kondo physics different from that in conventional ferromagnetic materials. For a half-filled impurity in undoped graphene, the presence of ferromagnetism can bring forth Kondo correlations, yielding two kink structures in the local spectral function near the Fermi energy. When the spin splitting of local occupations is compensated by an external magnetic field, the two Kondo kinks merge into a full Kondo resonance characterizing the fully screened ground state. Strikingly, we find the resulting Kondo temperature monotonically increases with the spin polarization of Dirac electrons, which violates the common sense that ferromagnetic bands are usually detrimental to Kondo correlations. Doped ferromagnetic graphene can behave as half metals, where its density of states at the Fermi energy linearly vanishes for one spin direction but keeps finite for the opposite direction. In this regime, we demonstrate an abnormal Kondo resonance that occurs in the first spin direction, while completely absent in the other one.
9 pages, 7 figures
References in corpus (28)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- The numerical renormalization group method for quantum impurity systems
- Magnetism in Graphene Induced by Single-Atom Defects
- Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
- Spin transport in proximity induced ferromagnetic graphene
- Real-time dynamics in Quantum Impurity Systems: A Time-dependent Numerical Renormalization Group Approach
- Sum-rule Conserving Spectral Functions from the Numerical Renormalization Group
- Kondo effect in quantum dots coupled to ferromagnetic leads
- A Numerical Renormalization Group approach to Green's Functions for Quantum Impurity Models
- Spin Precession and Real Time Dynamics in the Kondo Model: A Time-Dependent Numerical Renormalization-Group Study
- NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
- Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
- Adatoms and clusters of 3d transition metals on graphene: Electronic and magnetic configurations
- Kondo Quantum Criticality of Magnetic Adatoms in Graphene
- Phase transitions in the pseudogap Anderson and Kondo models: Critical dimensions, renormalization group, and local-moment criticality
- The Physics of Kondo Impurities in Graphene
- Localized Spins on Graphene
- Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
- Orbital selective and tunable Kondo effect of magnetic adatoms on graphene: Correlated electronic structure calculations
- Upper-critical dimension in a quantum impurity model: Critical theory of the asymmetric pseudogap Kondo problem
- Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes
- Gate-controlled Kondo screening in graphene: Quantum criticality and electron-hole asymmetry
- Inducing Kondo Screening of Vacancy Magnetic Moments in Graphene with Gating and Local Curvature
- Kondo effect with non collinear polarized leads: a numerical renormalization group analysis
- Kondo effect in graphene with Rashba spin-orbit coupling
- Localized states due to expulsion of resonant impurity levels from the continuum in bilayer graphene
- Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling