遷移金属カルコゲナイドナノチューブにおける量子輸送現象
| Project/Area Number |
18J14154
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 国内 |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
秦 峰 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2018-04-25 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2019: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2018: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | graphene / heterostructure / nonreciprocal / nonlinear / TMD material / nanotube / superconductivity / ionic liquid gating / intercalation / Little-Parks oscillation / diameter-dependent / curvature |
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| Outline of Annual Research Achievements |
This year, we are interested in such intrinsic second order signal generation in other different materials and also start to work on other topics. For example, in transport measurement, the symmetry allows that the second harmonic voltage could appear in transvers direction, and one of the microscopically contribution is from both the dispersion of band structure at the Fermi energy and the Berry curvature distribution in the momentum space. Such measurement of second harmonic voltage and also the symmetry engineering will be our recent goal in the near future.
In order to make graphene heterostructure, we have further developed our transfer technique and introduce dry pickup method in our lab. Furthermore, we carry out the polarized Raman spectrum and so that we could know the orientation of both materials and then precisely control the twisted angle. After optimize the fabrication process of graphene heterostructure device, we have finally achieve large size (tens micrometer size) high quality graphene interface, which can be measured by both transport and optics.
Finally, we observed pseudo magnetic field effect in graphene heterostructure, the shifted and thus duplicated the Landau fan diagram of pristine graphene into two branches, governed by time reversal symmetry. Second, we observed pretty good quantum Hall state and good edge transport phenomena. Third, we observed nonlinear signal in transverse direction without external magnetic field, originated from Berry curvature distribution at the Fermi surface in the momentum space.
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| Research Progress Status |
令和元年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和元年度が最終年度であるため、記入しない。
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Report
(2 results)
Research Products
(9 results)
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[Presentation] Superconductivity in a Chiral WS2 Nanotube2018
Author(s)
F. Qin, T. Ideue, W. Shi, M. Yoshida, A. Zak, R. Tenne, T. Kikitsu, D. Inoue, D. Hashizume & Y. Iwasa
Organizer
The 12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018)
Related Report
Int'l Joint Research
