Page d'accueil // FSTC // Actualités // Quantum Seminar: RKKY interaction on the surface of 3D Dirac semimetals by Vardan Kaladzhyan

Quantum Seminar: RKKY interaction on the surface of 3D Dirac semimetals by Vardan Kaladzhyan

twitter linkedin facebook google+ email this page
Add to calendar
Conférencier : Vardan Kaladzhyan
Date de l'événement : mardi 27 novembre 2018 11:00 - 13:00
Lieu : Campus Limpertsberg - Bâtiment des Sciences - BSC E002-001
University of Luxembourg
1511 Luxembourg

We study the RKKY interaction between two magnetic impurities located on the surface of a three-dimensional Dirac semimetal with two Dirac nodes in the band structure. By taking into account both bulk and surface contributions to the exchange interaction between the localized spins,

we demonstrate that the surface contribution in general dominates the bulk one at distances larger than the inverse node separation due to a weaker power-law decay. We find a strong anisotropy of the surface term with respect to the spins being aligned along the node separation axis or perpendicular to it. In the many impurity dilute regime, this implies formation of quasi-one dimensional magnetic stripes orthogonal to the node axis. We also discuss the effects of a surface spin-mixing term coupling electrons from spin-degenerate Fermi arcs induced by a superconducting proximity pairing term