Exceptional Spin‐to‐Charge Conversion in Selective Band Topology of Bi/Bi 1‐x Sb x with Spintronic Singularity

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Abstract
In this study, spin‐to‐charge conversion (SCC) of various topological materials with ferromagnet is investigated using spintronic terahertz (THz) emission spectroscopy. Compared with other topological materials, significantly large THz emission is observed for topologically nontrivial phases of Bi 1‐x Sb x ( x > 0.2) that predominantly originates from the topological surface state. When Bi is superposed above a certain stoichiometry of Bi 1‐x Sb x , it plays a crucial role in generating a highly spin‐split state and enhancing the spin‐mixing conductance, resulting in colossal THz emission. This proves that improving the SCC efficiency through interface engineering is a useful strategy to design a powerful spintronic device. Collectively, this study proposes a methodology for systematically analyzing SCC efficiency or spin Hall angle using THz emission spectroscopy and offers an efficient structure for future spintronic devices.
Funding Information
  • National Research Foundation of Korea
  • Electronics and Telecommunications Research Institute

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