Ultrafast Spin‐Charge Conversion at SnBi 2 Te 4 /Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Advanced Optical Materials Année : 2022

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

J. Hawecker
  • Fonction : Auteur
C. Song
  • Fonction : Auteur
M. Mičica
  • Fonction : Auteur
Juliette Mangeney
Jérôme Tignon
T. Boulier
  • Fonction : Auteur
P. Le Fèvre
Sukhdeep Dhillon

Résumé

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 spinlocked 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.
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Dates et versions

hal-04146895 , version 1 (30-06-2023)

Identifiants

Citer

E. Rongione, S. Fragkos, L. Baringthon, J. Hawecker, E. Xenogiannopoulou, et al.. Ultrafast Spin‐Charge Conversion at SnBi 2 Te 4 /Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy. Advanced Optical Materials, 2022, 10 (7), pp.2102061. ⟨10.1002/adom.202102061⟩. ⟨hal-04146895⟩
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