Strong and Weak Topology Probed by Surface Science

通过表面科学的强与弱拓扑探测:相变合金与重金属石墨烯的拓扑绝缘体性质

凝聚态物理学

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442.00
作      者
出  版 社
出版时间
2016年01月15日
装      帧
平装
ISBN
9783658118105
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页      码
166
语      种
英语
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图书简介
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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