Suppressed Kondo screening in two-dimensional altermagnets

Abstract

We have studied the Kondo effect of a spin-1/2 impurity coupled to a two-dimensional altermagnet host material. To attain the low-temperature many-body Kondo physics of the system, we have performed a numerical renormalization group calculations that allows us to access the spectral properties of the system at zero temperature. The impurity spectral function and the Kondo temperature were calculated for different set of parameters, including Rashba spin-orbit coupling (RSOC) and an external magnetic field. Interestingly, in the RSOC and altermagnetic fields, the hybridization function is spin independent, despite the characteristic broken time-reversal symmetry of the altermagnet. This is because the alternating sign of the spin splitting of the bands in the momentum space renders equal contributions for both spin components of the hybridization function. Our results demonstrate that, although the hybridization function is time-reversal symmetric, the Kondo temperature is substantially suppressed by the altermagnet coupling. Moreover, we have investigated the effect of an external magnetic field applied in the altermagnet along different directions. Interestingly, we observe an important restraining of the Kondo peak which depends strongly on the direction of the field. This anisotropic effect is, however, masked if strong Zeeman splitting takes place at the impurity, as it shatters the Kondo-singlet state.

arXiv commentUpdated version accepted for publication in Phys. Rev. B

References in corpus (24)

• The numerical renormalization group method for quantum impurity systems
• Cuba - a library for multidimensional numerical integration
• Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets
• Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering
• Giant and tunneling magnetoresistance effects from anisotropic and valley-dependent spin-momentum interactions in antiferromagnets
• Prediction of unconventional magnetism in doped FeSb2
• Kondo effect in quantum dots coupled to ferromagnetic leads
• Numerical Renormalization Group Calculations for the Self-energy of the impurity Anderson model
• Energy resolution and discretization artefacts in the numerical renormalization group
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals
• Phase-shifted Andreev levels in an altermagnet Josephson junction
• Zero-field Kondo splitting and quantum-critical transition in double quantum dots
• Kondo effect in three-dimensional Dirac and Weyl systems
• Enhancement of the Kondo effect through Rashba spin-orbit interactions
• Inducing Kondo Screening of Vacancy Magnetic Moments in Graphene with Gating and Local Curvature
• Quantum Critical Transition and Kondo Screening of Magnetic Moments in Graphene
• The Kondo effect in the presence of the Rashba spin-orbit interaction
• Influence of Rashba spin-orbit coupling on the Kondo effect
• Kondo effect in a quantum wire with spin-orbit coupling
• Observing the universal screening of a Kondo impurity
• Rigorous Wilsonian Renormalization Group for impurity models with a spectral gap
• Temperature evolution of the Kondo peak beyond Fermi liquid theory
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires

Cited by in corpus (7)

• Impurity-induced Friedel oscillations in altermagnets and $p$-wave magnets
• Intrinsic nonlinear conductivity induced by quantum geometry in altermagnets and measurement of the in-plane Néel vector
• Out-of-plane Edelstein effects: Electric-field induced magnetization in $p$-wave magnets
• Magnetic impurities in an altermagnetic metal
• Quasiparticle interference in altermagnets
• Quantum geometry and elliptic optical dichroism in $p$-wave magnets
• Altermagnetism in Heavy Fermion Systems: Mean-Field study on Kondo Lattice