Ultrafast Spin‐Charge Conversion at SnBi 2 Te 4 /Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy

Autor: E. Rongione, S. Fragkos, L. Baringthon, J. Hawecker, E. Xenogiannopoulou, P. Tsipas, C. Song, M. Mičica, J. Mangeney, J. Tignon, T. Boulier, N. Reyren, R. Lebrun, J.‐M. George, P. Le Fèvre, S. Dhillon, A. Dimoulas, H. Jaffrès
Přispěvatelé: Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES [France]-Centre National de la Recherche Scientifique (CNRS), Institute of Nanoscience and Nanotechnology 'Demokritos' [Greece] (INN), National Center for Scientific Research 'Demokritos' (NCSR), Nano-THz, Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), European Project: 824123,SKYTOP, European Project: 863155,H2020,s-NEBULA(2020)
Rok vydání: 2022
Předmět:
Zdroj: Advanced Optical Materials
Advanced Optical Materials, 2022, 10 (7), pp.2102061. ⟨10.1002/adom.202102061⟩
ORCID
arXiv.org e-Print Archive
ISSN: 2195-1071
Popis: Comment: to appear in Advanced Optical materials (02/2022)
Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices for terahertz (THz) emission. Here, the THz generation generally occurs mainly via SCC consisting in efficient dynamical spin injection into spin-locked TSS. In this work, we demonstrate sizable THz emission from a nanometric thick topological insultator (TI)/ferromagnetic junction - SnBi$_2$Te$_4$/Co - specifically designed to avoid bulk band crossing with the TSS at the Fermi level, unlike its parent material Bi$_2$Te$_3$. THz emission time domain spectroscopy (TDS) is used to indicate the TSS contribution to the SCC by investigating the TI thickness and angular dependence of the THz emission. This work illustrates THz emission TDS as a powerful tool alongside angular resolved photoemission spectroscopy (ARPES) methods to investigate the interfacial spintronic properties of TI/ferromagnet bilayers.
Databáze: OpenAIRE
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