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Strong and Weak Topology Probed by Surface Science

Автор: Bo0mB0om » 29 февраля 2016
Strong and Weak Topology Probed by Surface Science

Strong and Weak Topology Probed by Surface Science: Topological Insulator Properties of Phase Change Alloys and Heavy Metal Graphene
Springer | Materials | February 23, 2016 | ISBN-10: 3658118105 | 166 pages | pdf | 8.2 mb






Authors: Pauly, Christian
Publication in the field of natural sciences

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.

Number of Illustrations and Tables
24 illus., 53 in colour
Topics
Solid State Physics
Nanoscale Science and Technology
Spectroscopy and Microscopy

9783658118105








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