Kondo effect in a one-dimensional d-wave superconductor
Theoretische Physik, ETH-Hönggerberg - CH-8093 Zürich, Switzerland
Accepted: 5 January 2000
We derive a solvable resonant-level–type model, to describe an impurity spin coupled to zero-energy bound states localized at the edge of a one-dimensional d-wave superconductor. This results in a two-channel Kondo effect with a quite unusual low-temperature thermodynamics. For instance, the local impurity susceptibility yields a finite maximum at zero temperature (but no -divergence) due to the splitting of the impurity in two Majorana fermions. Moreover, we make comparisons with the Kondo effect occurring in a two-dimensional d-wave superconductor.
PACS: 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 72.15.Qm – Scattering mechanisms and Kondo effect
© EDP Sciences, 2000