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Dirac cone and pseudogapped density of states in the topological half-Heusler compound YPtBi

Citace:
KRONENBERG, A., BRAUN, J. W., MINÁR, J., ELMERS, H. J., KUTNYAKHOV, D., ZAPOROZHCHENKO, A. V., WALLAUER, R., CHERNOV, S. V., MEDJANIK, K., SCHÖNHENSE, G., KLÄUI, M., CHADOV, S., EBERT, H., JOURDAN, M. Dirac cone and pseudogapped density of states in the topological half-Heusler compound YPtBi. PHYSICAL REVIEW B, 2016, roč. 94, č. 16, s. 161108. ISSN: 2469-9950
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Dirac cone and pseudogapped density of states in the topological half-Heusler compound YPtBi
Rok vydání: 2016
Autoři: Andreas Kronenberg , Jürgen W. Braun , Doc.Dr. Jan Minár , Hans Joachim Elmers , Dmytro Kutnyakhov , Anna V. Zaporozhchenko , Robert Wallauer , Sergey V. Chernov , Katerina Medjanik , Gerd Schönhense , Mathias Kläui , Stanislav Chadov , Hubert Ebert , Martin Jourdan
Abstrakt CZ: Topologické izolátory (Tis) jsou zajímavé materiály, které vykazují nebývalé vlastnosti. . Zde jsme prozkoumali sloučeniny YPtBi jako příklad ze třídy polovu-Heuslerových materiálů.
Abstrakt EN: 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.
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