Ultrafast Spin?Charge Conversion at SnBi <sub>2</sub> Te <sub>4</sub> /Co Topological Insulator Interfaces Probed by Terahertz Emission Spectroscopy
نویسندگان
چکیده
Spin-to-charge conversion (SCC) involving topological surface states (TSS) is one of the most promising routes for highly efficient spintronic devices terahertz (THz) emission. Here, THz generation generally occurs mainly via SCC consisting in dynamical spin injection into spin-locked TSS. In this work, we demonstrate sizable emission from a nanometric thick insultator (TI)/ferromagnetic junction - SnBi$_2$Te$_4$/Co specifically designed to avoid bulk band crossing with TSS at Fermi level, unlike its parent material Bi$_2$Te$_3$. time domain spectroscopy (TDS) used indicate contribution by investigating TI thickness and angular dependence This work illustrates TDS as powerful tool alongside resolved photoemission (ARPES) methods investigate interfacial properties TI/ferromagnet bilayers.
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ژورنال
عنوان ژورنال: Advanced Optical Materials
سال: 2022
ISSN: ['2195-1071']
DOI: https://doi.org/10.1002/adom.202102061