Identification of Tellurium based Phase-Change Materials as Strong Topological Insulators
Phase-change materials (PCMs) [111, 112] are a class of materials which have become of tremendous technological importance over the last two decades. Their ability of a fast and reversible phase transition between an amorphous and crystalline phase makes them appropriate for the application in data storage. PCMs based on Ge-Sb-Te (GST) alloys are characterized by a profound change of optical reflectivity and electrical conductivity upon changing from the amorphous to the crystalline phase [113, 114]. As a consequence, these alloys are already widely used in optical data storage, such as compact discs (CDs) or rewritable digital video discs (DVDs).
KeywordsSpin Polarization Landau Level Topological Insulator Dirac Point Valence Band Maximum
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