2023 Fiscal Year Annual Research Report
Development of Magnetic Microscopy using RF Photon Assisted Tunneling between Superconductor Electrodes
| Project/Area Number |
21K04873
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
米田 忠弘 東北大学, 多元物質科学研究所, 教授 (30312234)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | STM / radiofrequency / PAT |
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| Outline of Annual Research Achievements |
Combining radio frequency (RF) signals in scanning tunneling microscopy (STM) attracts attention for electron spin resonance detection of a single molecule. We inject an RF signal in the STM tunneling junction, which contains a radical molecule of TOV at the sample temperature of 400 mK. The dI/dV curve without the RF shows a Kondo resonance with a width of 2 meV originating from S=1/2. At an RF frequency of 10.4 GHz, the Kondo peak at the Fermi level split into two peaks whose energy coincides with the AC electric field of the RF (Vac). We propose a model to modify the Tien-Gordon model for the photon-assisted tunneling (PAT) process by introducing the electron-photon coupling constant. This work suggests a pathway to tuning the electron-photon coupling constant in the RF region.
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