DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 42: Topological Insulators (jointly with TT, HL)

MA 42.6: Vortrag

Mittwoch, 16. März 2011, 18:00–18:15, HSZ 04

Thallium-based topological insulators from first principles — •Gustav Bihlmayer1, Sergey V. Eremeev2, Stefan Blügel1, and Eugene V. Chulkov31Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, Jülich, Germany — 2Institute of Strength Physics and Materials Science, Tomsk, Russia — 3Donostia International Physics Center (DIPC), San Sebastián, Spain

Currently, there is a substantial interest in topological insulators, which show protected edge-states carrying dissipationless spin currents. Among the new classes of these materials the Tl-based compounds TlAB2 (A=Bi,Sb; B=Se,Te) have attracted considerable interest both on the experimental and theoretical side. We present density functional theory calculations of the bulk materials and their (111) surfaces, displaying protected Dirac-cone shaped surface states together with "trivial" surface states. In contrast to layered materials like Bi2Te3, these compounds are of more three-dimensional character. From the bulk calculations we observe a strong sensitivity of the topological properties on the structural details, that have to be described very accurately. In the surface calculations deeply penetrating Dirac-cone states are observed, calling for careful convergence of the calculations with respect to the film thickness. Similar materials, e.g. the sulfides and InAB2 compounds will be discussed for comparison.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2011 > Dresden