Dirakův kužel a pseudogapped hustota stavů v topologické polovině Heuslerovy sloučeniny YPtBi
| Autor: | Stanislav Chadov, R. Wallauer, Sergey V. Chernov, Andreas Kronenberg, Jürgen Braun, Gerd Schönhense, Hubert Ebert, D. Kutnyakhov, Anna V. Zaporozhchenko, Katerina Medjanik, Mathias Kläui, Martin Jourdan, Jan Minár, Hans-Joachim Elmers |
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| Rok vydání: | 2016 |
| Předmět: |
topologické izolátory
Physics Condensed matter physics Spintronics Fermi energy 02 engineering and technology engineering.material Spin current 021001 nanoscience & nanotechnology Heusler compound 01 natural sciences Dirac cone topological insulators Heuslerovy slitiny Topological insulator 0103 physical sciences Heusler alloys engineering Density of states Condensed Matter::Strongly Correlated Electrons Thin film 010306 general physics 0210 nano-technology |
| Zdroj: | Physical Review B. 94 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | Topologické izolátory (Tis) jsou zajímavé materiály, které vykazují nebývalé vlastnosti. . Zde jsme prozkoumali sloučeniny YPtBi jako příklad ze třídy polovu-Heuslerových materiálů. Topological insulators (TIs) are exciting materials, which exhibit unprecedented properties, such as helical spinmomentum locking, which leads to large torques for magnetic switching and highly efficient spin current detection. Here we explore the compound YPtBi, an example from the class of half-Heusler materials, for which the typical band inversion of topological insulators was predicted. We prepared this material as thin films by conventional cosputtering from elementary targets. By in situ time-of-flight momentum microscopy, a Dirac conelike surface state with a Dirac point 300 meV below the Fermi energy was observed, in agreement with electronic structure-photoemission calculations. Only little additional spectral weight due to other states was observed at EF , which corroborates the identification of the topologically protected surface state and is highly relevant for spintronics applications. |
| Databáze: | OpenAIRE |
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