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- ItemThe Weak 3D Topological Insulator Bi12Rh3Sn3I9(Weinheim : Wiley-VCH, 2020) LĂȘ Anh, Mai; Kaiser, Martin; Ghimire, Madhav Prasad; Richter, Manuel; Koepernik, Klaus; Gruschwitz, Markus; Tegenkamp, Christoph; Doert, Thomas; Ruck, MichaelTopological insulators (TIs) gained high interest due to their protected electronic surface states that allow dissipation-free electron and information transport. In consequence, TIs are recommended as materials for spintronics and quantum computing. Yet, the number of well-characterized TIs is rather limited. To contribute to this field of research, we focused on new bismuth-based subiodides and recently succeeded in synthesizing a new compound Bi12Rh3Sn3I9, which is structurally closely related to Bi14Rh3I9 â a stable, layered material. In fact, Bi14Rh3I9 is the first experimentally supported weak 3D TI. Both structures are composed of well-defined intermetallic layers of â2[(Bi4Rh)3I]2+ with topologically protected electronic edge-states. The fundamental difference between Bi14Rh3I9 and Bi12Rh3Sn3I9 lies in the composition and the arrangement of the anionic spacer. While the intermetallic 2D TI layers in Bi14Rh3I9 are isolated by â1[Bi2I8]2â chains, the isoelectronic substitution of bismuth(III) with tin(II) leads to â2[Sn3I8]2â layers as anionic spacers. First transport experiments support the 2D character of this material class and revealed metallic conductivity. © 2020 The Authors. Published by Wiley-VCH GmbH
- ItemDimensionsanalyse fĂŒr Ingenieure : Dimensionstheoretische Grundlagen und Anwendungsbeispiele(Hannover : Technische Informationsbibliothek, 2023) Kleinschmidt, WalterDer vorliegende Text stellt eine Ăberarbeitung und Erweiterung der Vorlesungsunterlagen dar, die der Verfasser wĂ€hrend seiner frĂŒheren LehrtĂ€tigkeit im Fachbereich Maschinentechnik der UniversitĂ€t Siegen erstellt hat. Dabei liegt der Schwerpunkt auf den fĂŒr Ingenieure interessanten vielfĂ€ltigen und teilweise umfĂ€nglichen Anwendungsbeispielen zur Dimensionsanalyse. Diese zweite Version v2 des Textes enthĂ€lt einige PrĂ€zisierungen und weitere Anwendungsbeispiele.