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- W3157325844 abstract "Owing to their remarkable spin–charge conversion (SCC) efficiency, topological insulators (TIs) are the most attractive candidates for spin–orbit torque generators. The simple method of enhancing SCC efficiency is to reduce the thickness of TI films to minimize the trivial bulk contribution. However, when the thickness reaches the ultrathin regime, the SCC efficiency decreases owing to intersurface hybridization. To overcome these contrary effects, we induced dehybridization of the ultrathin TI film by breaking the inversion symmetry between surfaces. For the TI film grown on an oxygen-deficient transition-metal oxide, the unbonded transition-metal d-orbitals affected only the bottom surface, resulting in asymmetric surface band structures. Spintronic terahertz emission spectroscopy, an emerging tool for investigating the SCC characteristics, revealed that the resulting SCC efficiency in symmetry-broken ultrathin Bi2Se3 was enhanced by up to ∼2.4 times." @default.
- W3157325844 created "2021-05-10" @default.
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- W3157325844 date "2021-05-04" @default.
- W3157325844 modified "2023-10-17" @default.
- W3157325844 title "Enhanced Spin-to-Charge Conversion Efficiency in Ultrathin Bi<sub>2</sub>Se<sub>3</sub> Observed by Spintronic Terahertz Spectroscopy" @default.
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- W3157325844 doi "https://doi.org/10.1021/acsami.1c03168" @default.
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