Details
Strong and Weak Topology Probed by Surface Science
Topological Insulator Properties of Phase Change Alloys and Heavy Metal GrapheneMatWerk
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53,49 € |
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| Verlag: | Springer |
| Format: | |
| Veröffentl.: | 22.01.2016 |
| ISBN/EAN: | 9783658118112 |
| Sprache: | englisch |
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Beschreibungen
<p>Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb<sub>2</sub>Te<sub>3</sub> and Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> 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 Bi<sub>14</sub>Rh<sub>3</sub>I<sub>9</sub>, 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.</p>
Introduction.- Fundamentals of Topological Insulators.- Experimental Methods.- Identification of Tellurium based Phase-Change Materials as Strong Topological Insulators.- Weak Topological Insulator.- Summary.
<p><b>Christian Pauly</b> 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.</p>
<p>Christian Pauly demonstrates the strong topological properties of the technologically relevant phase change materials Sb<sub>2</sub>Te<sub>3</sub> and Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> 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 Bi<sub>14</sub>Rh<sub>3</sub>I<sub>9</sub>, 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.</p> <p></p> <p></p> <p><b>Contents</b></p> <p></p><ul><li>Fundamentals of topological insulators<br></li><li>Experimental methods<br></li><li>Identification of tellurium based phase change materials as strong topological insulators<br></li><li>Weak topological insulators<br></li></ul><p></p> <p></p> <p><b>Target Groups</b></p> <p></p><ul><li>Researchers and students from the fields of </li></ul>physics, especially condensed materials<br><p></p> <p> </p> <p><b></b></p><b>About the Author</b><p></p> <p><b>Christian Pauly</b> 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.</p>
Publication in the field of natural sciences
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