idw – Informationsdienst Wissenschaft
Nachrichten, Termine, Experten
Nachrichten, Termine, Experten
Abstract: Topological insulators represent a new state of matter, which is protected by certain symmetries and can arise, for example, from strong spin-orbit coupling. While their basic properties can be captured in a single-particle picture, the understanding of the consequences of strong electronic correlations has become a key research topic. Here, we study the effect of a realistic long-range Coulomb interaction in the framework of the Kane-Mele model. Our results from exact quantum Monte Carlo simulations establish the phase diagram, which contains a Dirac semimetal, a topological insulator, and an antiferromagnetic Mott insulator. A finite-size scaling analysis is consistent with a novel fermionic critical point in the absence of spin-orbit coupling, as appropriate for graphene. Furthermore, we discuss the possibility of a Mott metal-insulator transition in the helical edge states.
Information on participating / attending:
Interessierte sind herzlich eingeladen!
Veranstalter: Institut für Physik, Prof. Holger Fehske
Kontakt: Dipl.-Ing. (FH) Heike Schäffner
Institut für Physik
Felix-Hausdorff-Straße 6, 17489 Greifswald
Telefon 03834 86-4716
heike.schaeffner@uni-greifswald.de
Date:
07/16/2015 17:00 - 07/16/2015 18:00
Event venue:
Institut für Physik
Felix-Hausdorff-Straße 6
17489 Greifswald
Mecklenburg-Vorpommern
Germany
Target group:
Scientists and scholars, Students
Relevance:
transregional, national
Subject areas:
Physics / astronomy
Types of events:
Presentation / colloquium / lecture
Entry:
07/01/2015
Sender/author:
Sabine Köditz
Department:
Presse- und Informationsstelle
Event is free:
no
Language of the text:
German
URL of this event: http://idw-online.de/en/event51376
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