Indirect exchange interaction between magnetic impurities in the two dimensional topological insulator based on CdTe HgTe CdTe quantum wells

by Igor Burmistrov

at Condensed Matter Theory Seminar

Wed, 23 Nov 2016, 13:30
Physics building (#54) room 207

Abstract

We study indirect exchange interaction between magnetic impurities in the 001 CdTe HgTe CdTe symmetric quantum well We consider low temperatures and the case of the chemical potential placed in the energy gap of the two dimensional quasiparticle spectrum We find that the indirect exchange interaction is suppressed exponentially with the distance between magnetic impurities The presence of inversion asymmetry results in oscillations of the indirect exchange interaction with the distance and generates additional terms which are noninvariant under rotations in the 001 plane The indirect exchange interaction matrix has complicated structure with some terms proportional to the sign of the energy gap In the case of magnetic impurities located near the edge of the 2D electron system in 001 CdTe HgTe CdTe symmetric quantum well there exist additional terms in the indirect exchange interaction due to the interference between the edge and bulk states

Created on 13-11-2016 by Bar Lev, Yevgeny (ybarlev)
Updaded on 13-11-2016 by Bar Lev, Yevgeny (ybarlev)