Indirect exchange interaction between magnetic impurities in the twodimensional topological insulator based on CdTe/HgTe/CdTe quantum wells
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 twodimensional 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.
 Publication:

Physical Review B
 Pub Date:
 October 2016
 DOI:
 10.1103/PhysRevB.94.155408
 arXiv:
 arXiv:1607.07645
 Bibcode:
 2016PhRvB..94o5408K
 Keywords:

 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 13 pages, 6 figures