Influence of Rashba spin-orbit coupling on the Kondo effect

Abstract

An Anderson model for a magnetic impurity in a two-dimensional electron gas with bulk Rashba spin-orbit interaction is solved using the numerical renormalization group under two different experimental scenarios. For a fixed Fermi energy, the Kondo temperature T_K varies weakly with Rashba coupling α, as reported previously. If instead the band filling is low and held constant, increasing αcan drive the system into a helical regime with exponential enhancement of T_K. Under either scenario, thermodynamic properties at low temperatures T exhibit the same dependences on T/T_K as are found for α= 0. Unlike the conventional Kondo effect, however, the impurity exhibits static spin correlations with conduction electrons of nonzero orbital angular momentum about the impurity site. We also consider a magnetic field that Zeeman splits the conduction band but not the impurity level, an effective picture that arises under a proposed route to access the helical regime in a driven system. The impurity contribution to the system's ground-state angular momentum is found to be a universal function of the ratio of the Zeeman energy to a temperature scale that is not T_K (as would be the case in a magnetic field that couples directly to the impurity spin), but rather is proportional to T_K divided by the impurity hybridization width. This universal scaling is explained via a perturbative treatment of field-induced changes in the electronic density of states.

15 pages, 11 figures. v2: clarifying remarks added

References in corpus (6)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Electric-field controlled spin reversal in a quantum dot with ferromagnetic contacts
• Gate-controlled spin-splitting in quantum dots with ferromagnetic leads in the Kondo regime
• The Two Dimensional Kondo Model with Rashba Spin-Orbit Coupling
• Kondo effect in graphene with Rashba spin-orbit coupling
• Tuning the electrically evaluated electron Lande g factor in GaAs quantum dots and quantum wells of different well widths

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• Tunable correlation effects of magnetic impurities by the cubic Rashba spin-orbit couplings
• Spin-orbit coupling effects over thermoelectric transport properties in quantum dots
• Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires
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• Antisymmetric Spin-Orbit Coupling Effect on Kondo-Induced Electric Polarization in a Triangular Triple Quantum Dot
• Natural orbitals renormalization group approach to a spin-1/2 impurity interacting with two helical liquids
• Fractional Local Moment and High Temperature Kondo Effect in Rashba-Fermi Gases
• Spin relaxation and the Kondo effect in transition metal dichalcogenide monolayers
• Magnetic correlation between two local spins in a quantum spin Hall insulator
• Thermodynamics of Two-impurity Anderson Model with Dzyaloshinskii-Moriya Interaction
• Quantum impurity with 2/3 local moment in 1D quantum wires: an NRG study
• Kondo effect under arbitrary spin-momentum locking
• Steady-state dc transport through an Anderson impurity coupled to leads with spin-orbit coupling