Spontaneous gap generation on the surface of weakly interacting topological insulators using nonmagnetic impurities
2014 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 90, no 16, 161413- p.Article in journal (Refereed) Published
Strong nonmagnetic impurities on the surface of three-dimensional topological insulators (TIs) generate localized resonance peaks close to the Dirac point. We show that this results in a strongly reduced critical Coulomb interaction strength to reach a magnetic surface state, following a Stoner-like criterion. Thus even weakly interacting TIs host a finite (local) magnetization around strong nonmagnetic impurities. The local magnetization gives rise to a global energy gap, linearly dependent on the maximum value of the magnetization but decreasing with reduced impurity concentration.
Place, publisher, year, edition, pages
2014. Vol. 90, no 16, 161413- p.
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-238174DOI: 10.1103/PhysRevB.90.161413ISI: 000344032300002OAI: oai:DiVA.org:uu-238174DiVA: diva2:770251