Observation and control of valley-spin-polarized current at quantum confinement structures in graphene
Project/Area Number |
18H01812
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 28020:Nanostructural physics-related
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Research Institution | Chiba University |
Principal Investigator |
Aoki Nobuyuki 千葉大学, 大学院工学研究院, 教授 (60312930)
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Co-Investigator(Kenkyū-buntansha) |
音 賢一 千葉大学, 大学院理学研究院, 教授 (30263198)
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Project Period (FY) |
2018-04-01 – 2022-03-31
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Project Status |
Completed (Fiscal Year 2021)
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Budget Amount *help |
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
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Keywords | 量子ポイントコンタクト / 2層グラフェン / 量子化伝導度 / 遷移金属ダイカルコゲナイド / WSe2 / バレー偏極 / スピン偏極 / スピン・軌道相互作用 / ゼロ磁場スピン分裂 / 2次元物質 / 量子伝導現象 / グラフェン / 高移動度化 / 量子閉じ込め構造 / バレー / 垂直電場印加 / 高移動度 / 量子閉じ込め / バレースピン / カー効果 / 電界閉じ込め / 六方晶窒化ホウ素 |
Outline of Final Research Achievements |
In this study, a high mobility bi-layer graphene (BLGr) laminated by hexagonal boron-nitride (h-BN) was used for a study of quantum point contact (QPC) which is electro-statically confined one-dimensional (1-d) channel with a dual gate structure. In the QPC structure formed by BLGr, a valley-polarized quantization in units of 2e2 divided by h has been observed, which suggests a valley polarized transport by the 1-d confinement. In addition, in the QPC structure with the 3-layer WSe2 as the channel, we have observed the quantized conductance steps with the units of e2 divided by h, which suggest both valley and spin polarized transport at zero-magnetic field condition.
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Academic Significance and Societal Importance of the Research Achievements |
近年,トポロジカル現象への注目が高くなってきている中で,電荷・スピンに次ぐ自由度としてバレーの効果を利用したバレーとロニクスが注目されている。円偏光の光照射を,垂直電場の印加によりK点とK'点のバレーの対称性を意図的に崩すことで幾何学的位相(ベリー位相)に差が生じ,結果的に試料内部に内部磁場が発生し,これがホール効果に類似したバレーホール効果として観測されてきている。本研究では,スプリットゲート構造という電気的な制御法によりバレー偏極のみならずスピンまで偏極した電流を実現したことから,新たなスピントロニクス/バレートロにクスの実現に役立つ成果といえる。
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Report
(5 results)
Research Products
(78 results)
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[Journal Article] Remote Mesoscopic Signatures of Induced Magnetic Texture in Graphene2021
Author(s)
N. Arabchigavkani, R. Somphonsane, H. Ramamoorthy, G. He, J. Nathawat, S. Yin, B. Barut, K. He, M. D. Randle, R. Dixit, K. Sakanashi, N. Aoki , K. Zhang, L. Wang, W.-N. Mei, P. A. Dowben , J. Fransson, and J. P. Bird
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Journal Title
Physical Review Letters
Volume: 126
Issue: 8
Pages: 086802-086802
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Investigation of laser-induced-metal phase of MoTe2 and its contact property via scanning gate microscopy2020
Author(s)
Kohei Sakanashi, Hidemitsu Ouchi, Kota Kamiya, Peter Kruger, Katsuhiko Miyamoto, Takashige Omatsu, Keiji Ueno, Kenji Watanabe, Takashi Taniguchi, Jonathan P. Bird, and Nobuyuki Aoki
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Journal Title
Nanotechnology
Volume: 31
Issue: 20
Pages: 205205-205205
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Transient Response of h-BN-Encapsulated Graphene Transistors: Signatures of Self-Heating and Hot-Carrier Trapping2019
Author(s)
J. Nathawat, M. Zhao, C.-P. Kwan, S. Yin, N. Arabchigavkani, M. Randle, H. Ramamoorthy, G. He, R. Somphonsane, N. Matsumoto, K. Sakanashi, M. Kida, N. Aoki, Z. Jin, Y. Kim, G.-H. Kim, K. Watanabe, T. Taniguchi, J. P Bird
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Journal Title
ACS Omega
Volume: 4
Issue: 2
Pages: 4082-4090
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Hot carriers in CVD-grown graphene device with a top h-BN layer2018
Author(s)
C. Chuang, M. Mineharu, N. Matsumoto, M. Matsunaga, C.-W. Liu, B.-Y. Wu, Gil-Ho Kim, L.-H. Lin, Y. Ochiai, K. Watanabe, T. Taniguchi, C.-T. Liang and N. Aoki
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Journal Title
Journal of Nanomaterials
Volume: 2018
Pages: 1-7
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Large, non-saturating magnetoresistance in single layer chemical vapor deposition graphene with an h-BN capping layer2018
Author(s)
Chiashain Chuang, C.-T. Liang, Gil-Ho Kim, R.E. Elmquist, Y. Yang, Y.P. Hsieh, Dinesh K. Patel, K. Watanabe, T. Taniguchi, and N. Aoki
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Journal Title
Carbon
Volume: 136
Pages: 211-216
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 垂直電場印加による2層グラフェンにおける量子ポイントコンタクトの形成2018
Author(s)
荒川友貴, 村瀬健太郎, 坂梨昂平, 松本直樹, Y.-S. Kim, G.-H. Kim, 渡邊賢司, 谷口尚, D.K. Ferry, J.P. Bird, 青木伸之
Organizer
日本物理学会2018年秋季大会
Related Report
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[Presentation] Fabrication of quantum point contact in bilayer graphene by application of vertical electric field2018
Author(s)
Kentaro Murase, Kohei Sakanashi, Tomoki Arakawa, Naoki Matsumoto, Yong S. Kim, Geun H. Kim, Kenji Watanabe, Takashi Taniguchi, Jonathan P. Bird, D. K. Ferry, Kenichi Oto and Nobuyuki Aoki
Organizer
2018 Ajou University-Chiba University Joint Symposium
Related Report
Int'l Joint Research
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