Wakayama University · Faculty of Systems Engineering · 准教授

Research keywordsepr imaging・diamond charge transport・spin dynamics・cyclotron resonance・trap state analysis・microwave cavity physics

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• Fast passage effect in cw-ODMR of an ensemble of NV− centers2025 · Yusuke Maki, Hideto Matsuoka, Ikuko Akimoto
• Cyclotron resonance imaging at cryogenic temperatures enabled by electric field modification in a microwave cavity2024 · Ikuko Akimoto, Takayuki Suzuki, Nobuko Naka, Hideto Matsuoka (担当区分： 筆頭著者 )
• Photogenerate electron- and hole-trap distributions in Al-doped anatase TiO2 crystals measured by cryogenic EPR imaging2024 · Abstract Electron paramagnetic resonance (EPR) imaging was performed on aluminium-doped anatase titanium dioxide (TiO₂) crystals to demonstrate the distributions of photoinduced trapped electrons and holes at cryogenic temperatures. Complementary distributions of trapped electrons and holes were observed at 25 K; trapped electrons were predominant on the {101} planes, whereas trapped holes were predominant on the (001) and {110} planes in the tetragonal crystal structure. These separate distributions are consistent with the reported facet-dependent photocatalytic efficiency of photoreduction and photooxidation in anatase crystals, resulting from crystal plane-dependent carrier transfer. By this extrinsic trap system, the carrier transport properties were derivatively extracted through electron and hole traps This report provides insight into the fundamental physics governing the facet dependence of photocatalytic effects.
• Temperature-dependent carrier injection routes under optical excitation in high-purity diamond crystals2023 · S. Hamabata, I. Akimoto, N. Naka

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