Mark Pauly; Flaura Winston; Mary Naylor; Kevin Volpp; Lawton Robert Burns; Ralph Muller; David Asch; Rachel Werner; Bimal Desai Cambridge University Press (2022) Pehmeäkantinen kirja
Springer Sivumäärä: 166 sivua Asu: Pehmeäkantinen kirja Julkaisuvuosi: 2016, 30.01.2016 (lisätietoa) Kieli: Englanti Tuotesarja:MatWerk
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.
