Christian Pauly

Strong and Weak Topology Probed by Surface Science (eBook, PDF)

Topological Insulator Properties of Phase Change Alloys and Heavy Metal Graphene

• Format: PDF

Produktbeschreibung

Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb₂Te₃ and Ge₂Sb₂Te₅ 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 Bi₁₄Rh₃I₉, 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.

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Produktdetails

• Verlag: Springer Fachmedien Wiesbaden
• Seitenzahl: 166
• Erscheinungstermin: 22. Januar 2016
• Englisch
• ISBN-13: 9783658118112
• Artikelnr.: 44613207

Autorenporträt

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.

Inhaltsangabe

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