2017 Fiscal Year Final Research Report
Investigation of relaxation dynamics of the spin current using current fluctuation measurement
| Project/Area Number |
15K17680
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics I
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| Research Institution | Osaka University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | スピン流 / 電流ゆらぎ / メゾスコピック系 / ショット雑音 / 近藤効果 |
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| Outline of Final Research Achievements |
We succeeded to develop the two types of Kondo effect of SU (2) and SU (4) in artificial atom of carbon nanotube. The Kondo effect is a quantum many body phenomena caused by an electron spin and plays an important role in relaxing the spin current at low temperature. In addition, we have systematically controlled these Kondo effects and measured the current fluctuation using a handmade measurement system. As a result, we succeeded to quantitatively evaluate the electron scattering phenomenon accompanying the Kondo effect, and obtained results consistent with the theory. We also measured the current fluctuation in the two-dimensional electron system of GaAs / AlGaAs and graphene, and got the result which clarified the origin of the phenomenon which is appears in the non-equilibrium state.
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| Free Research Field |
数物系科学
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