Kondo screening regimes of a quantum dot with a single Mn ion

Abstract

We study the Kondo and transport properties of a quantum dot with a single magnetic Mn ion connected to metallic leads. By employing a numerical renormalization group technique we show that depending on the value of ferromagnetic coupling strength between the local electronic spin and the magnetic moment of the Mn, two distinct Kondo regimes exist. In the weak coupling limit, the system can be found in a completely screened Kondo state describing a local magnetic moment decoupled from the rest of the system. In contrast, in the strong coupling regime the quantum dot spin and the local magnetic moment form a single large-spin entity partially Kondo screened. A crossover between these two regimes can be suitably tuned by varying the tunnel coupling between the quantum dot electron and the leads. The model investigated here is also suitable to study magnetic molecules adsorbed on a metallic surface. The rich phenomenology of these systems is reflected in the conductance across the system.

5 pages, 4 figures

References in corpus (7)

• The numerical renormalization group method for quantum impurity systems
• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Interplay of the Kondo Effect and Spin-Polarized Transport in Magnetic Molecules, Adatoms and Quantum Dots
• Suppression of electron spin relaxation in Mn-doped GaAs
• Quantum Transport Through a Stretched Spin--1 Molecule
• Thermal dependence of the zero-bias conductance through a nanostructure
• Ground State and Excitations of Quantum Dots with "Magnetic Impurities"

Cited by in corpus (4)

• Coulomb blockade and Kondo effect in the electronic structure of Hubbard molecules connected to metallic leads: a finite-temperature exact-diagonalization study
• Temperature dependence of electronic transport through molecular magnets in the Kondo regime
• Spin relaxation in CdTe quantum dots with a single Mn atom
• Magnetic field modulated Kondo effect in a single-magnetic-ion molecule