Exploring the phase diagram of the two-impurity Kondo problem
arXiv:1411.4415 · doi:10.1038/ncomms10046
Abstract
A system of two exchange-coupled Kondo impurities in a magnetic field gives rise to a rich phase space hosting a multitude of correlated phenomena. Magnetic atoms on surfaces probed through scanning tunnelling microscopy provide an excellent platform to investigate coupled impurities, but typical high Kondo temperatures prevent field-dependent studies from being performed, rendering large parts of the phase space inaccessible. We present an integral study of pairs of Co atoms on insulating Cu2N/Cu(100), which each have a Kondo temperature of only 2.6 K. In order to cover the different regions of the phase space, the pairs are designed to have interaction strengths similar to the Kondo temperature. By applying a sufficiently strong magnetic field, we are able to access a new phase in which the two coupled impurities are simultaneously screened. Comparison of differential conductance spectra taken on the atoms to simulated curves, calculated using a third order transport model, allows us to independently determine the degree of Kondo screening in each phase.
paper: 14 pages, 4 figures; supplementary: 3 pages, 1 figure, 1 table
References in corpus (20)
- The role of magnetic anisotropy in the Kondo effect
- Tunable Non-local Spin Control in a Coupled Quantum Dot System
- Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
- Exchange interaction between single magnetic adatoms
- Theory of single spin inelastic tunneling spectroscopy
- Temperature and magnetic field dependence of a Kondo system in the weak coupling regime
- Control of single-spin magnetic anisotropy by exchange coupling
- Spin wave imaging in atomically designed nanomagnets
- A Tunable Two-impurity Kondo system in an atomic point contact
- RKKY and magnetic field interactions in coupled Kondo quantum dots
- Local control of single atom magneto-crystalline anisotropy
- Interplay between Kondo effect and Ruderman-Kittel-Kasuya-Yosida interaction
- Two-Site Kondo Effect in Atomic Chains
- Tuning Molecule-Mediated Spin Coupling in Bottom-Up Fabricated Vanadium-TCNE Nanostructures
- The Spin-Polarization of the Split Kondo State
- Consequences of Kondo exchange on quantum spins
- Controlled complete suppression of single-atom inelastic spin and orbital cotunnelling
- Exchange interaction between magnetic adatoms on surfaces of noble metals
- Spectral properties of the two-impurity Anderson model with varying distance and various interactions
- Kondo screening in high-spin side-coupled two-impurity clusters
Cited by in corpus (37)
- Designer quantum states of matter created atom-by-atom
- Atomic spin chain realization of a model for quantum criticality
- Spin decoherence of magnetic atoms on surfaces
- Probing Magnetic Excitations and Correlations in Single and Coupled Spin Systems with Scanning Tunneling Spectroscopy
- Two-Impurity Yu-Shiba-Rusinov States in Coupled Quantum Dots
- Scaling of tripartite entanglement at impurity quantum phase transitions
- Non-locally sensing the magnetic states of nanoscale antiferromagnets with an atomic spin sensor
- Kondo resonance of a Co atom exchange coupled to a ferromagnetic tip
- Nonequilibrium critical scaling from quantum thermodynamics
- Controlled complete suppression of single-atom inelastic spin and orbital cotunnelling
- Emergent Coherent Lattice Behavior in Kondo Nanosystems
- Correlation Driven Transport Asymmetries Through Coupled Spins
- Kondo breakdown in a spin-1/2 chain of adatoms on a Dirac semimetal
- Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)
- Effective low-energy description of the two impurity Anderson model: RKKY interaction and quantum criticality
- Observation of spin-orbit coupling induced Weyl points and topologically protected Kondo effect in a two-electron double quantum dot
- Observation of biradical spin coupling through hydrogen bonds
- Sensing the spin of an individual Ce adatom
- Spin chain on a metallic surface: Dissipation-induced order vs. Kondo entanglement
- Mutual information, quantum phase transition, and phase coherence in Kondo systems
- Tuning a two-impurity Kondo system by a moiré superstructure
- Kondo QED: The Kondo effect and photon trapping in a two-impurity Anderson model ultra-strongly coupled to light
- Exploring the Kondo effect of an extended impurity with chains of Co adatoms in a magnetic field
- Magnetic degeneracy points in interacting two-spin systems: geometrical patterns, topological charge distributions, and their stability
- Realistic quantum critical point in one-dimensional two-impurity models
- Rescuing a Quantum Phase Transition with Quantum Noise
- Single-Co Kondo effect in atomic Cu wires on Cu(111)
- Competition between Kondo and Kitaev Physics in Kitaev clusters coupled to a fermionic bath
- Selective generation and amplification of RKKY interactions by P-N interface
- Equilibrium and real-time properties of the spin correlation function in the two-impurity Kondo model
- Asymmetry effects on the phases of RKKY-coupled two-impurity Kondo systems
- Investigation of the Yu-Shiba-Rusinov states of a multi-impurity Kondo system
- Topological charge distributions of an interacting two-spin system
- Large insulating nitride islands on Cu3Au as a template for atomic spin structures
- Quantum oscillations of Kondo screening phases in strong magnetic fields
- On-chip quantum sensing of Kondo spins in a high-mobility quasi-one-dimensional nanoconstriction
- Phases and phase transitions of an chain on metallic and semi-metallic surfaces