Exploring the Kondo Effect of an Extended Impurity with Chains of Co Adatoms in a Magnetic Field.

@article{Danu2019ExploringTK,
  title={Exploring the Kondo Effect of an Extended Impurity with Chains of Co Adatoms in a Magnetic Field.},
  author={Bimla Danu and Fakher F. Assaad and Fr{\'e}d{\'e}ric Mila},
  journal={Physical review letters},
  year={2019},
  volume={123 17},
  pages={
          176601
        }
}
Motivated by recent STM experiments, we explore the magnetic field induced Kondo effect that takes place at symmetry protected level crossings in finite Co adatom chains. We argue that the effective two-level system realized at a level crossing acts as an extended impurity coupled to the conduction electrons of the substrate by a distribution of Kondo couplings at the sites of the chain. Using auxiliary-field quantum Monte Carlo simulations, which quantitatively reproduce the field dependence… 
View on PubMed
infoscience.epfl.ch
6 Citations
Methods Citations
1

6 Citations

Kondo Breakdown in a Spin-1/2 Chain of Adatoms on a Dirac Semimetal.

The Kondo interaction is irrelevant at the decoupled fixed point, leading to the existence of a Kondo-breakdown phase and aKondo- breakdown critical point separating such a phase from a heavy Fermi liquid.

Breakdown of heavy quasiparticles in a honeycomb Kondo lattice: A quantum Monte Carlo study

We show that for the half-filled Kondo lattice model on the honeycomb lattice a Kondo breakdown occurs at small Kondo couplings J k within the magnetically ordered phase. This stands in contrast to…

Zooming in on heavy fermions in Kondo lattice models

Resolving the heavy fermion band in the conduction electron momentum resolved spectral function of the Kondo lattice model is challenging since, in the weak coupling limit, its spectral weight is…

Spin dynamics of an Ising chain with bond impurity in a tilt magnetic field

Dissipation-Induced Order: The S=1/2 Quantum Spin Chain Coupled to an Ohmic Bath.

We consider an S=1/2 antiferromagnetic quantum Heisenberg chain where each site is coupled to an independent bosonic bath with ohmic dissipation. The coupling to the bath preserves the global SO(3)…

The ALF (Algorithms for Lattice Fermions) project release 2.0. Documentation for the auxiliary-field quantum Monte Carlo code

The Algorithms for Lattice Fermions package provides a general code for the finite temperature auxiliary field quantum Monte Carlo algorithm and discusses how to use the package to implement the Kondo lattice model and the $SU(N)$-Hubbard-Heisenberg model.

References

SHOWING 1-10 OF 37 REFERENCES

Real space manifestations of coherent screening in atomic scale Kondo lattices

One-dimensional lattices of cobalt atoms on a metallic surface are built and the onset of heavy fermion behaviour is observed and explained in terms of the indirect hybridization of the Kondo orbitals mediated by a coherent electron gas.

Kondo resonance narrowing in d- and f-electron systems.

The consequences of Kondo resonance narrowing for the Mott transition in d-band materials, particularly iron pnictides, and the narrow ESR linewidth recently observed in ferromagnetically correlated f-electron materials are discussed.

Kondo effect in a magnetic field and the magnetoresistivity of kondo alloys

: The effect of a magnetic field on the spectral density of a S = 1/2 Kondo impurity is investigated at zero and finite temperatures by using Wilson's numerical renormalization group method. A…

Two-site Kondo effect in atomic chains.

Scanning tunneling spectroscopy reveals oscillations of the Kondo temperature T(K) with the number n of Cu atoms for n≥3 and density functional calculations show that the Ruderman-Kittel-Kasuya-Yosida interaction mediated by the Cu chains causes the oscillations.

Understanding the Josephson current through a Kondo-correlated quantum dot.

For increased tunnel couplings the Kondo scale becomes comparable to the superconducting gap, and the regime of the strongest competition between superconductivity and Kondo correlations is reached; the gate voltage dependence of the critical current in this regime is predicted.

Building Complex Kondo Impurities by Manipulating Entangled Spin Chains.

It is shown that the Kondo screening of the full chain by the electrons of the nonmagnetic substrate depends on the interatomic entanglement of the spins in the chain, demonstrating the prerequisites to build and probe spatially extended strongly correlated nanostructures.

Quantum-tunneling-induced Kondo effect in single molecular magnets.

It is demonstrated that, for a half-integer spin of the molecule, electron and spin tunneling cooperate to produce both quantum tunneling of the magnetic moment and a Kondo effect in the linear conductance.

QUANTUM MONTE CARLO SIMULATIONS OF THE HALF-FILLED TWO-DIMENSIONAL KONDO LATTICE MODEL

The 2D half-filled Kondo lattice model with exchange J and nearest neighbor hopping t is considered. It is shown that this model belongs to a class of Hamiltonians for which zero-temperature…

Tunneling into a single magnetic atom: spectroscopic evidence of the kondo resonance

Spectroscopic measurements performed on individual cobalt atoms on the surface of gold show an energetically narrow feature that is identified as the Kondo resonance-the predicted response of a Kondo impurity.

Orbital Kondo effect in carbon nanotubes

It is shown that the unique electronic structure of carbon nanotubes enables the observation of a purely orbital Kondo effect, and it is concluded that the orbital quantum number is conserved during tunnelling.