SmO thin films

• Verfasst von: Kasinathan, Deepa [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: SmO thin films
• Titelzusatz: a flexible route to correlated flat bands with nontrivial topology
• Verf.angabe: Deepa Kasinathan, Klaus Koepernik, L.H. Tjeng, and Maurits W. Haverkort
• Fussnoten: Gesehen am 20.09.2017
• Titel Quelle: Enthalten in: Physical review / B
• Jahr Quelle: 2015
• Band/Heft Quelle: 91(2015,19) Artikel-Nummer 195127, 8 Seiten
• ISSN Quelle: 1550-235X
• DOI: doi:10.1103/PhysRevB.91.195127
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1563683245

Abstract

Using density functional theory based calculations, we show that the correlated mixed-valent compound SmO is a three-dimensional strongly topological semimetal as a result of a 4f−5d band inversion at the X point. The [001] surface Bloch spectral density reveals two weakly interacting Dirac cones that are quasidegenerate at the ¯¯¯¯M point and another single Dirac cone at the ¯¯¯Γ point. We also show that the topological nontriviality in SmO is very robust and prevails for a wide range of lattice parameters, making it an ideal candidate to investigate topological nontrivial correlated flat bands in thin-film form. Moreover, the electron filling is tunable by strain. In addition, we find conditions for which the inversion is of the 4f−6s type, making SmO to be a rather unique system. The similarities of the crystal symmetry and the lattice constant of SmO to the well studied ferromagnetic semiconductor EuO, makes SmO/EuO thin film interfaces an excellent contender towards realizing the quantum anomalous Hall effect in a strongly correlated electron system.