Consequences of Kondo exchange on quantum spins

Abstract

When individual quantum spins are placed in close proximity to conducting substrates, the localized spin is coupled to the nearby itinerant conduction electrons via Kondo exchange. In the strong coupling limit this can result in the Kondo effect - the formation of a correlated, many body singlet state - and a resulting renormalization of the density of states near the Fermi energy. However, even when Kondo screening does not occur, Kondo exchange can give rise to a wide variety of other phenomena. In addition to the well known renormalization of the g factor and the finite spin decoherence and relaxation times, Kondo exchange has recently been found to give rise to a newly discovered effect: the renormalization of the single ion magnetic anisotropy. Here we put these apparently different phenomena on equal footing by treating the effect of Kondo exchange perturbatively. In this formalism, the central quantity is $\rho J$, the product of the density of states at the Fermi energy $\rho$ and the Kondo exchange constant J. We show that perturbation theory correctly describes the experimentally observed exchange induced shifts of the single spin excitation energies, demonstrating that Kondo exchange can be used to tune the effective magnetic anisotropy of a single spin.

7 pages, 2 figures

References in corpus (6)

• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Electric Field Controlled Magnetic Anisotropy in a Single Molecule
• Temperature and magnetic field dependence of a Kondo system in the weak coupling regime
• Control of single-spin magnetic anisotropy by exchange coupling
• Spin Inelastic Electron Tunneling Spectroscopy on Local Spin Adsorbed on Surface
• Excitation of local magnetic moments by tunnelling electrons

Cited by in corpus (23)

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• Exchange mechanism for electron paramagnetic resonance of individual adatoms
• Exploring the phase diagram of the two-impurity Kondo problem
• Transverse dynamical magnetic susceptibilities from regular static density functional theory: Evaluation of damping and g-shifts of spin-excitations
• The emergence of classical behavior in magnetic adatoms
• Renormalization of spin excitations and Kondo effect in open shell nanographenes
• Transport mirages in single-molecule devices
• Single spin resonance driven by electric modulation of the g factor anisotropy
• The Lipkin-Meshkov-Glick model with Markovian dissipation -- A description of a collective spin on a metallic surface
• Renormalization of single-ion magnetic anisotropy in the absence of Kondo effect
• Electronic properties of transition metal atoms on Cu${}_2$N/Cu(100)
• Extending the spin excitation lifetime of a magnetic molecule on a proximitized superconductor
• Competition between quantum spin tunneling and Kondo effect
• Simulation of inelastic spin flip excitations and Kondo effect in STM spectroscopy of magnetic molecules on metal substrates
• Impurity Knight shift in quantum dot Josephson junctions
• Relaxation and decoherence of qubits encoded in collective states of engineered magnetic structures
• Spin-fluctuation and spin-relaxation effects of single adatoms from first principles
• Optimizing tip-surface interactions in ESR-STM experiments
• Enhanced lifetimes of spin chains coupled to chiral edge states
• Tunable magnetic anisotropy from higher-harmonics exchange scattering on the surface of a topological insulator