O. Újsághy

Theory of the fano resonance in the STM tunneling density of states due to a single kondo impurity

The conduction electron density of states nearby single magnetic impurities, as measured recently by scanning tunneling microscopy (STM), is calculated, taking into account tunneling into conduction electron states only. The Kondo effect induces a narrow Fano resonance in the conduction electron density of states. The line shape varies with the distance between STM tip and impurity, in qualitative agreement with experiments, but is very sensitive to details of the band structure. For a Co impurity the experimentally observed width and shift of the Kondo resonance are in accordance with those obtained from a combination of band structure and strongly correlated calculations.

Spin-orbit-induced magnetic anisotropy for impurities in metallic samples. I. Surface anisotropy

Motivated by recent measurements of Kondo resistivity in thin films and wires, where the Kondo amplitude is suppressed for thinner samples, the surface anisotropy for magnetic impurities is studied. That anisotropy is developed in those cases where, in addition to the exchange interaction with the impurity, there is strong spin-orbit interaction for conduction electrons around the impurity in the ballistic region. The asymmetry in the neighborhood of the magnetic impurity exhibits the anisotropy axis

Spin-orbit-induced magnetic anisotropy for impurities in metallic samples. II. Finite-size dependence in the Kondo resistivity

\mathbf{n}

Statistical model for the effects of phase and momentum randomization on electron transport

which, in the case of a plane surface, is perpendicular to the surface. The anisotropy energy is

Kondo effect on mesoscopic scale

\ensuremath{\Delta}{E=K}_{d}(\mathbf{n}\mathbf{S}{)}^{2}

Decoherence-induced conductivity in the discrete one-dimensional Anderson model: A novel approach to even-order generalized Lyapunov exponents

for spin

Revised theory of the magnetic surface anisotropy of impurities in metallic mesoscopic samples

\mathbf{S}

Kondo effect in mesoscopic systems

, and the anisotropy constant

Spin-orbit-induced Kondo size effect in thin films with 5/2-spin impurities

{K}_{d}

Localization under the effect of randomly distributed decoherence

is inversionally proportional to distance