2016 CAP Congress / Congrès de l'ACP 2016

Is SmB6 the topological insulator or not ?

14 Jun 2016, 19:18

2m

SITE Atrium (University of Ottawa)

Poster (Student, Not in Competition) / Affiche (Étudiant(e), pas dans la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) DCMMP Poster Session with beer / Session d'affiches, avec bière DPMCM

Speaker

Mrs Khawla Elfied (Memorial University of Newfoundland)

Description

We theoretically examined whether samarium hexaboride (SmB${}_6$) is topological insulator, or not. Despite the fact that the SmB${}_6$ has long been known as a topological Kondo insulator, with strong correlations and band hybridization, it is still of a great interest because of low-temperature transport anomalies which have recently been interpreted as evidence that SmB${}_6$ is a topological insulator. SmB${}_6$ behaves electronically at high temperatures like an insulator, and at low temperature its resistance mysteriously saturates. We studies de Haas van-Alphen quantum oscillation results to resolve the Fermi surface topology in this material. Although dHvA measurement may be consistent with two-dimensional conducting electronic states, we find an elongated 3D ellipsoidal Fermi surface . Furthermore, resistance measurement also can give some evidence of SmB${}_6$ topological surface states, by study different geometries to determine whether the conduction is dominated by the surface or the bulk. Another measurement is Scanning Tunneling Microscopy (STM) which use to discover the properties of the surface states with atomic spatial resolution.Finally, Angle-resolved photo-emission spectroscopy (ARPES), is another useful surface state probe directly the electronic structure of the (SmB${}_6$).

Presentation materials

poster.pdf