Strong and Weak Topology Probed by Surface Science

Topological Insulator Properties of Phase Change Alloys and Heavy Metal Graphene
1. Auflage 2015
ISBN: 978-3-658-11810-5
Verlag: Springer

Buch, Englisch, 166 Seiten, Format (B × H): 148 mm x 210 mm, Gewicht: 2354 g

Reihe: MatWerk

Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb Te and Ge Sb Te by using two powerful techniques for mapping the surface electronic structure: scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). In the case of a phase change material, this opens up the possibility of switching between an insulating amorphous and a conducting topological phase on nanosecond-time scales. Moreover, the author presents first experimental results of a weak topological insulator, namely on the bismuth-based graphene-like sheet system Bi Rh I , revealing a topologically protected one-dimensional edge channel as its fingerprint. The edge state is as narrow as 0.8 nm, making it extremely attractive to device physics. Those strong and weak topological insulators are a new phase of quantum matter giving rise to robust boundary states which are protected from backscattering and localization.

Zielgruppe

Research

Autoren/Hrsg.

Pauly, Christian

Fachgebiete

• Naturwissenschaften Chemie Analytische Chemie Magnetresonanz
• Naturwissenschaften Physik Elektromagnetismus Mikroskopie, Spektroskopie
• Naturwissenschaften Physik Thermodynamik Festkörperphysik, Kondensierte Materie
• Technische Wissenschaften Technik Allgemein Nanotechnologie

Inhaltsverzeichnis

Introduction.- Fundamentals of Topological Insulators.- Experimental Methods.- Identi?cation of Tellurium based Phase-Change Materials as Strong Topological Insulators.- Weak Topological Insulator.- Summary.

Über Autor(innen)

Christian Pauly is working as a postdoc in the II. Institute of physics B of the RWTH Aachen University. His work focuses on the study of the topological properties of graphene-like sheet systems which belong to the class of weak topological insulators.