Can the spin-orbit interaction break the channel degeneracy (conservation) of the two-channel orbital Kondo problem?
Hungarian Academy of Sciences and Budapest University of Technology
and Economics, Research Group “Theory of Condensed Matter”,
1521 Budapest, Hungary
2 Research Institute for Solid State Physics, POB 49, 1525 Budapest, Hungary
Corresponding author: a firstname.lastname@example.org
Revised: 21 October 2003
Published online: 8 December 2003
Two-level systems (TLS) interacting with conduction electrons are possibly described by the two-channel Kondo Hamiltonian. In this case the channel degeneracy is due to the real spin of the electrons. The possibility of breaking that degeneracy (conservation) has interest on his own. In fact, we show that the interaction of the conduction electrons with a spin-orbit scatterer nearby the TLS leads to the breaking of the channel degeneracy (conservation) only in the case of electron-hole symmetry breaking. The generated channel symmetry breaking TLS-electron couplings are, however, too weak to result in any observable effects.
PACS: 72.15.Cz – Electrical and thermal conduction in amorphous and liquid metals and alloys / 72.10.Fk – Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect) / 71.55.-i – Impurity and defect levels
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003