Exploring the Kondo effect of an extended impurity with chains of Co adatoms in a magnetic field

Abstract

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 of the zero-bias signal, we show that a proper Kondo resonance is present at the sites where the effective Kondo coupling dominates. Our modeling and numerical simulations provide a theoretical basis for the interpretation of the STM spectrum in terms of level crossings of the Co adatom chains.

arXiv comment12 pages, 12 figures

References in corpus (22)

• A Tunable Kondo Effect in Quantum Dots
• Orbital Kondo effect in carbon nanotubes
• The role of magnetic anisotropy in the Kondo effect
• Kondo effect in a magnetic field and the magnetoresistivity of Kondo alloys
• Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
• Quantum tunneling induced Kondo effect in single molecular magnets
• Atomic spin chain realization of a model for quantum criticality
• Quantum Monte Carlo simulations of the half-filled two-dimensional Kondo lattice model
• Spin and charge dynamics of the ferromagnetic and antiferromagnetic two-dimensional half-filled Kondo lattice model
• Kondo resonance narrowing in d- and f-electron systems
• Differential Conductance and Quantum Interference in Kondo Systems
• Properties of anisotropic magnetic impurities on surfaces
• Exploring the phase diagram of the two-impurity Kondo problem
• Understanding the Josephson current through a Kondo-correlated quantum dot
• Two-Site Kondo Effect in Atomic Chains
• The ALF (Algorithms for Lattice Fermions) project release 1.0. Documentation for the auxiliary field quantum Monte Carlo code
• The Spin-Polarization of the Split Kondo State
• Depleted Kondo Lattices
• Quantum Monte Carlo Simulation of Frustrated Kondo Lattice Models
• Finite-temperature linear conductance from the Matsubara Green function without analytic continuation to the real axis
• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials
• Emergent Coherent Lattice Behavior in Kondo Nanosystems

Cited by in corpus (8)

• Dissipation-Induced Order: The $S=1/2$ Quantum Spin Chain Coupled to an Ohmic Bath
• Zooming in on heavy fermions in Kondo lattice models
• Kondo breakdown in a spin-1/2 chain of adatoms on a Dirac semimetal
• Spin chain on a metallic surface: Dissipation-induced order vs. Kondo entanglement
• Breakdown of heavy quasiparticles in a honeycomb Kondo lattice: A quantum Monte Carlo study
• Critical phase induced by Berry phase and dissipation in a spin chain
• The ALF (Algorithms for Lattice Fermions) project release 2.4. Documentation for the auxiliary-field quantum Monte Carlo code
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces