Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz lasers

• Project/Area Number: 21H04546
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 21:Electrical and electronic engineering and related fields
• Research Institution: Tohoku University
• Principal Investigator: 尾辻 泰一 東北大学, 電気通信研究所, 教授 (40315172)
• Co-Investigator(Kenkyū-buntansha): 楢原 浩一 神奈川工科大学, 工学部, 教授 (00422171) ; 吹留 博一 東北大学, 電気通信研究所, 准教授 (10342841) ; Maxim・V Ryzhii 会津大学, コンピュータ理工学部, 上級准教授 (50254082) ; 佐藤 昭 東北大学, 電気通信研究所, 准教授 (70510410)
• Project Period (FY): 2021-04-05 – 2026-03-31
• Project Status: Granted (Fiscal Year 2024)
• Budget Amount: ¥42,120,000 (Direct Cost: ¥32,400,000、Indirect Cost: ¥9,720,000); Fiscal Year 2025: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2024: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2023: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2022: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2021: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
• Keywords: グラフェン / ディラックプラズモン / パリティ・時間反転対称性 / テラヘルツ / レーザ

Outline of Research at the Start

本研究は，グラフェンディラックプラズモンのパリティ（空間幾何学的）対称性と時間反転対称性をナノ構造と印加電圧によって能動的に制御するという全く新しい物理・原理の導入によって量子効率と高速変調動作の限界を同時に打破し，未踏THz周波数帯で室温動作する高強度・超高速変調型グラフェンプラズモニックレーザトランジスタの実現に挑む．

Outline of Annual Research Achievements

１. GDPメタ表面のPT 対称性のモデル化 （担当：分担者 楢原，佐藤，Ryzhii，代表者 尾辻）
・ADGG構造内のGDPメタ表面を電気格子とみなし，GDP波長に比して十分に短い空間セル分解能でGDP伝搬モード毎に損失・利得特性を等価回路化した散乱行列の多次元化を進めた．代表的なADGG構造・物性パラメータにおいてモード間結合を伴う正常応答を確認した．今後、構築した多次元散乱行列による数値解析法の種々のADGG構造・物性パラメータに対する汎用性を検証してゆく． 更に、上記伝送線路モデルと既開発の電磁界解析ツールを用いてADGG-GDP共振特性（モード周波数，Q値）とPT対称性との相関の解明を進めた，PT対称となる特異点は利得と損失が拮抗する動作点で発現することを確認できた。今後、ADGGの構造・物性パラメータに対する高速利得変調特性の相関と性能限界に対する見通しを得る．
２. ADGG-GFET内GDPの不安定状態におけるミクロスコピックなPT 対称性の解明と，超高速利得変調動作の原理検証 （担当：代表者 尾辻，分担者 吹留，佐藤；研究協力：松田（東大））
・デバイス試作プロセスは，東北大学電気通信研究所附属ナノ・スピン実験施設設備を利用して実施した．（担当：分担者 佐藤，吹留，代表者 尾辻）
・電圧印加状態での非平衡GDPダイナミクスをナノ空間分解能と100フェムト秒の時間分解能で直接観測可能な研究分担者：吹留，松田らが開発したオペランド時間・空間分解X線光電子分光装置を用いて観測する実験を進めた．（担当：分担者 吹留；　研究協力：松田（東大））更に、超高速利得変調動作実験の準備を進めたが、2022.３.１６に発生した宮城県沖地震により研究代表者所有のTHz時間領域分光装置が損壊し中断した．政府補償による代替装置購入の目途が立ち、2023年度には実験再開できる見込みである．

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

理由
以下の通り，いずれの研究課題においても計画通りに順調に進展している．
１. GDPメタ表面のPT 対称性のモデル化 （担当：分担者 楢原，佐藤，Ryzhii，代表者 尾辻） ：　計画通りに順調に進展している．
２. ADGG-GFET内GDPの不安定状態におけるミクロスコピックなPT 対称性の解明と，超高速利得変調動作の原理検証 （担当：代表者 尾辻，分担者 吹留，佐藤；
研究協力：松田（東大））：　一部の実験（2022.３.１６に発生した宮城県沖地震で損壊した研究代表者所有THz時間領域分光装置を用いる高速変調動作観測実験）を除いては計画通りに順調に進展している．また、地震により中断した当該実験も2023年度に再開の見通しが得られている．

Strategy for Future Research Activity

１. GDPメタ表面のPT 対称性のモデル化 （担当：分担者 楢原，佐藤，Ryzhii，代表者 尾辻）
・構築した多次元散乱行列による数値解析法の種々のADGG構造・物性パラメータに対する汎用性を検証してゆく．更に、ADGGの構造・物性パラメータに対する高速利得変調特性の相関と性能限界に対する見通しを得る．
２. ADGG-GFET内GDPの不安定状態におけるミクロスコピックなPT 対称性の解明と，超高速利得変調動作の原理検証 （担当：代表者 尾辻，分担者 吹留，佐藤；研究協力：松田（東大））
・ADGG-GFETのPT対称性をゲートおよびドレインバイアスによって電気的に操作し，GDPの利得と共振器端反射係数を高速かつ能動的に変調することによって，レーザ発振の高速ON/OFF制御が可能であることを実証する．実験には、政府調達による補償で2022.3.16の地震で損壊した装置の代替購入の目途が立ったTHz時間・周波数領域分光装置を用いる．

Research Products

• [Int'l Joint Research] レンセラー工科大学/ニューヨーク州立大学バッファロー校/ライス大学(米国)
• [Int'l Joint Research] サラマンカ大学(スペイン)
• [Int'l Joint Research] 国立高圧物理学研究所/ワルシャワ大学(ポーランド)
• [Int'l Joint Research] モンペリエ大学/国立中央研究センター(フランス)
• [Int'l Joint Research] ニューヨーク州立大学バッファロー校/レンセラー工科大学/ライス大学(米国)
• [Int'l Joint Research] サラマンカ大学(スペイン)
• [Int'l Joint Research] コテルニコフ無線電子工学研究所/マイクロ構造物理学研究所/バウマンモスクワ州立工科大学(ロシア連邦)
• [Int'l Joint Research] モンペリエ大学/国立中央研究センター(フランス)
• [Int'l Joint Research] 国立高圧物理学研究所/ワルシャワ大学(ポーランド)
• [Journal Article] Enhanced Oscillation Frequency in Series-Connected Resonant-Tunneling Diode-Oscillator Lattice Loop (2023)
  • Author(s): NARAHARA Koichi、MAEZAWA Koichi
  • Journal Title: IEICE Transactions on Electronics Volume: E106.C Issue: 7 Pages: 395-404
  • DOI: 10.1587/transele.2022ECP5031
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2023-07-01
  • Peer Reviewed
• [Journal Article] Self-excitation of Terahertz Plasmons in Graphene FETs Enabled by Transit-time Negative Dynamic Conductance (2023)
  • Author(s): M. Ryzhii, V. Ryzhii, T. Otsuji, V. Mitin and M. S. Shur
  • Journal Title: 2023 International Conference for Advancement in Technology (ICONAT) Volume: 1 Pages: 1-5
  • DOI: 10.1109/iconat57137.2023.10080743
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dynamics of Topological Defects in a Tunnel-Diode Oscillator Lattice Loop (2023)
  • Author(s): Narahara Koichi
  • Journal Title: Journal of the Physical Society of Japan Volume: 92 Issue: 3 Pages: 0344021-10
  • DOI: 10.7566/jpsj.92.034402
  • Peer Reviewed
• [Journal Article] Trends and Future Prospects in the Research of Graphene Plasmonic THz Devices (2022)
  • Author(s): Taiichi Otsuji
  • Volume: J105-C
  • Issue: 12
  • Pages: 358-366
  • DOI: 10.14923/transelej.2022JCI0007
  • ISSN: 1881-0217
  • Year and Date: 2022-12-01
  • Peer Reviewed
• [Journal Article] Controlling the PT symmetry of Dirac plasmons in dual-grating-gate graphene THz laser transistors for ultrafast gain switching (2022)
  • Author(s): Taiichi Otsuji, Akira Satou, Hirokazu Fukidome, Maxim Ryzhii, Victor Ryzhii, and Koichi Narahara
  • Journal Title: CLEO: Conference on Lasers and Electro-Optics. Volume: 1 Pages: 1-2
  • DOI: 10.1364/cleo_at.2022.jth3b.10
  • Peer Reviewed / Open Access
• [Journal Article] Discovery of Coulomb-Drag Instability of Graphene Dirac Plasmons (2022)
  • Author(s): Victor Ryzhii, Maxim Ryzhii, Akira Satou, Vladimir Mitin, Michael Shur, and Taiichi Otsuji
  • Journal Title: IRMMW-THz: the 47th International Conference on Infrared, Millimeter, and Terahertz Waves. Volume: 1 Pages: 1-2
  • DOI: 10.1109/irmmw-thz50927.2022.9966853
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Resonant plasmonic terahertz detection in gated graphene p-i-n field-effect structures enabled by nonlinearity from Zener-Klein tunneling (2022)
  • Author(s): V. Ryzhii, T. Otsuji, M. Ryzhii, V. Mitin, and M.S. Shur
  • Journal Title: Phys. Rev. Appl. Volume: 18 Issue: 3
  • DOI: 10.1103/physrevapplied.18.034022
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Transit-time resonances enabling amplification and generation of terahertz radiation in periodic graphene p-i-n structures with the Zener-Klein interband tunneling (2022)
  • Author(s): V. Ryzhii, M. Ryzhii, V. Mitin, M.S. Shur, and T Otsuji
  • Journal Title: J. Appl. Phys. Volume: 132 Issue: 18
  • DOI: 10.1063/5.0124086
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Ultrafast terahertz transparency boosting in graphene meta-cavities (2022)
  • Author(s): Lan Wang, Ning An, Sen Gong, Xuan Sheng, Yiwei Li, Baicheng Yao, CuiYu, Zezhao He, Qingbin Liu, Zhihong Feng, Taiichi Otsuji, and Yaxin Zhang
  • Journal Title: Nanophotonics Volume: 11 Issue: 21 Pages: 4899-4907
  • DOI: 10.1515/nanoph-2022-0511
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fast and sensitive terahertz detection in a current-driven epitaxial-graphene asymmetric dual-grating-gate FET structure (Featured article) (2022)
  • Author(s): K. Tamura, C. Tang, D. Ogiura, K. Suwa, H. Fukidome, Y. Takida, H. Minamide, T. Suemitsu, T. Otsuji, and A. Satou
  • Journal Title: APL Photon. Volume: 7 Issue: 12
  • DOI: 10.1063/5.0122305
  • Peer Reviewed / Open Access
• [Journal Article] Interaction of rotary pulses in a closed lattice of tunnel diode oscillators (2022)
  • Author(s): Narahara Koichi
  • Journal Title: Nonlinear Dynamics Volume: 108 Issue: 3 Pages: 2751-2765
  • DOI: 10.1007/s11071-022-07296-8
  • Peer Reviewed
• [Journal Article] A frequency divider using interacting self‐sustained pulses in a tunnel‐diode‐oscillator lattice (2022)
  • Author(s): Narahara Koichi
  • Journal Title: International Journal of Circuit Theory and Applications Volume: 50 Issue: 9 Pages: 3266-3278
  • DOI: 10.1002/cta.3310
  • Peer Reviewed
• [Journal Article] Mutual synchronization of rotary pulses in coupled tunnel‐diode oscillator lattice loops (2022)
  • Author(s): Narahara Koichi
  • Journal Title: International Journal of Circuit Theory and Applications Volume: 51 Issue: 4 Pages: 1958-1969
  • DOI: 10.1002/cta.3526
  • Peer Reviewed
• [Journal Article] オペランド・ナノX線分光を活用した次世代高周波デバイス研究 (2022)
  • Author(s): 吹留博一
  • Journal Title: 信学技報 Volume: 122 Pages: 13-15
• [Journal Article] Ballistic Injection Terahertz Plasma Instability in Graphene n + -i-n-n + Field-Effect Transistors and Lateral Diodes (2022)
  • Author(s): V. Ryzhii, M. Ryzhii, A. Satou, V. Mitin, M.S. Shur, and T. Otsuji
  • Journal Title: Physica Status Solidi A: Appl. and Mat. Sci. (Top Cover Art) Volume: 219 Issue: 1
  • DOI: 10.1002/pssa.202100694
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Graphene-based plasmonic metamaterial for terahertz laser transistors (2022)
  • Author(s): T. Otsuji, S.A. Boubanga-Tombet, A. Satou, D. Yadav, H. Fukidome, T. Watanabe, T. Suemitsu, A.A. Dubinov, V.V. Popov, W. Knap, V. Kachorovskii, K. Narahara, M. Ryzhii, V. Mitin, M.S. Shur, and V. Ryzhii
  • Journal Title: Nanophoton. (invited, review) Volume: 11 Issue: 9 Pages: 1677-1696
  • DOI: 10.1515/nanoph-2021-0651
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] テラヘルツ通信応用に向けたグラフェンレーザートランジスタ技術 (2022)
  • Author(s): 尾辻泰一
  • Journal Title: 日本赤外線学会誌 (invited) Volume: 31 Pages: 68-75
  • Peer Reviewed
• [Journal Article] Graphene-based plasma-wave devices for terahertz applications (2022)
  • Author(s): T. Otsuji, V. Ryzhii, and M. Shur
  • Journal Title: Proc. SPIE (invited) Volume: 11975 Pages: 3-3
  • DOI: 10.1117/12.2604818
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Coulomb drag and plasmonic effects in graphene field-effect transistors enable resonant terahertz detection (2022)
  • Author(s): M. Ryzhii, V. Ryzhii, T. Otsuji, V. Mitin, and M.S. Shur
  • Journal Title: Appl. Phys. Lett. Volume: 120 Issue: 11
  • DOI: 10.1063/5.0087678
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Broadband reduction of phase noise in a spatially extended tunnel‐diode oscillator through multiple self‐injection locking (2022)
  • Author(s): K. Narahara
  • Journal Title: Int. J. Circ. Theor. Appl. Volume: 50 Issue: 4 Pages: 1342-1352
  • DOI: 10.1002/cta.3215
  • Peer Reviewed
• [Journal Article] Environmental effects on layer-dependent dynamics of Dirac fermions in quasicrystalline bilayer graphene (2022)
  • Author(s): Y. Zhao, T. Suzuki, T. Iimori, H.-W. Kim, J. R. Ahn, M. Horio, Y. Sato, Y. Fukaya, T. Kanai, K. Okazaki, S. Shin, S. Tanaka, F. Komori, H. Fukidome and I. Matsuda
  • Journal Title: Physical Review B Volume: 105 Issue: 11 Pages: 1-8
  • DOI: 10.1103/physrevb.105.115304
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Generation of Large-Amplitude Pulses through the Pulse Shortening Superposed in Series-Connected Tunnel-Diode Transmission Line (2021)
  • Author(s): K. Narahara
  • Journal Title: IEICE Transactions on Electronics Volume: E104.C Issue: 8 Pages: 394-397
  • DOI: 10.1587/transele.2020ECS6021
  • NAID: 130008070231
  • ISSN: 0916-8524, 1745-1353
  • Year and Date: 2021-08-01
  • Peer Reviewed
• [Journal Article] S-shaped current-voltage characteristics of n+-i-n-n+ graphene field-effect transistors due the Coulomb drag of quasi-equilibrium electrons by ballistic electrons (2021)
  • Author(s): V. Ryzhii, M. Ryzhii, V. Mitin, M.S. Shur, and T. Otsuji
  • Journal Title: Phys. Rev. Appl. Volume: 16 Issue: 1
  • DOI: 10.1103/physrevapplied.16.014001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz lasers (2021)
  • Author(s): T. Otsuji, A. Satou, V. Ryzhii, H. Fukidome, and K. Narahara
  • Journal Title: AAAFM-UCLA2021: International Conference on Advances in Functional Materials Abstract Book, Paper ID: 718, UCLA, Los Angeles, CA, USA and Online, Aug. 18-20, 2021. (invited) Volume: 1 Pages: 1-1
  • Peer Reviewed
• [Journal Article] Coulomb electron drag mechanism of terahertz plasma instability in n+-i-n-n+ graphene FETs with ballistic injection (2021)
  • Author(s): V. Ryzhii, M. Ryzhii, V. Mitin, M.S. Shur, and T. Otsuji
  • Journal Title: Appl. Phys. Lett. Volume: 119 Issue: 9
  • DOI: 10.1063/5.0061722
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Coulomb drag by injected ballistic carriers in graphene n+-i-n-n+ structures: doping and temperature effects (2021)
  • Author(s): V. Ryzhii, T. Otsuji, M. Ryzhii, V. Mitin, and M.S. Shur
  • Journal Title: Physica Status Solidi A: Appl. and Mat. Sci. (Top Cover Art) Volume: 218 Issue: 21
  • DOI: 10.1002/pssa.202170059
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Paving the way for tunable graphene plasmonic THz amplifiers (2021)
  • Author(s): Stephane Albon Boubanga-Tombet, Akira Satou, Deepika Yadav, Dmitro B But, Wojciech Knap, Vyacheslav V Popov, Iliya V Gorbenko, Valentin Kachorovskii and Taiichi Otsuji
  • Journal Title: Frontiers in Physics (invited, review) Volume: 9
  • DOI: 10.3389/fphy.2021.726806
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Plasmonic field-effect transistors (TeraFETs) for 6G communications (2021)
  • Author(s): M. Shur, G. Aizin, T. Otsuji, and V. Ryzhii
  • Journal Title: Sensors (invited, review) Volume: 21 Issue: 23 Pages: 7907-7907
  • DOI: 10.3390/s21237907
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of Coulomb carrier drag and terahertz plasma instability in p+-p-i-n-n+ graphene tunneling transistor structures (2021)
  • Author(s): V. Ryzhii, M. Ryzhii, A. Satou, T. Otsuji, V. Mitin, and M.S. Shur
  • Journal Title: Phys. Rev. Appl. Volume: 16 Issue: 6
  • DOI: 10.1103/physrevapplied.16.064054
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Submillimeter-Wave Multiphase Oscillation Using Traveling Pulses in a Resonant-Tunneling Diode-Oscillator Lattice (2021)
  • Author(s): S. Sawai and K. Narahara
  • Journal Title: J. Infrared Millim. Terahz. Waves Volume: 42 Issue: 4 Pages: 426-445
  • DOI: 10.1007/s10762-021-00780-z
  • Peer Reviewed / Open Access
• [Journal Article] Interaction of Self-Sustained Pulses in Tunnel-Diode Oscillator Lattices (2021)
  • Author(s): K. Narahara
  • Journal Title: Math. Prob. Eng. Volume: 2021 Pages: 1-14
  • DOI: 10.1155/2021/5027127
  • Peer Reviewed / Open Access
• [Journal Article] Atomic arrangements of quasicrystal bilayer graphene: Interlayer distance expansion (2021)
  • Author(s): Yuki Fukaya, Yuhao Zhao, Hyun Woo Kim, Joung Real Ahn, Hirokazu Fukidome, Iwao Matsuda
  • Journal Title: Phys. Rev. B Volume: 104 Issue: 18
  • DOI: 10.1103/physrevb.104.l180202
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] デバイス用基板上SiC単結晶薄膜を用いた超高品質グラフェンと高周波デバイスの廉価な製造法の創出 (2021)
  • Author(s): 吹留博一
  • Journal Title: 表面と真空 Volume: 64 Issue: 7 Pages: 318-323
  • DOI: 10.1380/vss.64.318
  • NAID: 130008064273
  • Peer Reviewed
• [Presentation] Self-excitation of Terahertz Plasmons in Graphene FETs Enabled by Transit-time Negative Dynamic Conductance (2023)
  • Author(s): M. Ryzhii, V. Ryzhii, T. Otsuji, V. Mitin and M. S. Shur
  • Organizer: 2023 International Conference for Advancement in Technology (ICONAT), Goa, India, Jan. 24-26, 2023.
  • Int'l Joint Research
• [Presentation] Beyond 5G超高速・超大容量無線通信システムのためのヘテロジニアス光電子融合技術 (2023)
  • Author(s): 尾辻泰一
  • Organizer: 電子情報通信学会総合大会シンポジウム「Beyond5G/6Gに向けたミリ波・テラヘルツ波無線技術の研究開発最前線」, BCI-1-5, 芝浦工業大学大宮キャンパス, 埼玉県大宮市内, Mar. 7-10, 2023.
  • Invited
• [Presentation] ラマン分光法の裏面適用によるプロセス中のグラフェン膜質評価 (2023)
  • Author(s): 関宏信，田村紘一, 唐超，吹留博一，佐藤昭，尾辻泰一
  • Organizer: 第70回応用物理学会春季学術講演会, 17a-B309-7, 上智大学四谷キャンパス, 東京, March 15-18, 2023.
• [Presentation] 放射光を用いた先端デバイス・回路の研究開発と社会実装・国際標準化に向けた取り組み (2023)
  • Author(s): 吹留博一
  • Organizer: 第36回日本放射光学会, 立命館大学草津キャンパス, Jan. 7, 2023, （招待講演）
  • Invited
• [Presentation] 二次元原子薄膜を用いた 超高周波デバイスの研究開発 (2023)
  • Author(s): 吹留博一
  • Organizer: 未来ICTシンポジウム, 東京ビッグサイト, Feb. 1, 2023, （招待講演）
  • Invited
• [Presentation] 単原子長ゲートによる低環境負荷物質から成る高出力THz帯増幅器の創出 (2023)
  • Author(s): 吹留博一
  • Organizer: テラヘルツ無線のB5G/6Gに向けての取り組み その２, Online, Feb. 27, 2023, （招待講演）
  • Invited
• [Presentation] Controlling the PT symmetry of Dirac plasmons in dual-grating-gate graphene THz laser transistors for ultrafast gain switching (2022)
  • Author(s): Taiichi Otsuji, Akira Satou, Hirokazu Fukidome, Maxim Ryzhii, Victor Ryzhii, and Koichi Narahara
  • Organizer: CLEO: Conference on Lasers and Electro-Optics 2022, the San Jose McEnery Convention Center, San Jose, California, USA, May 15-20, 2022.
  • Int'l Joint Research
• [Presentation] Controlling the PT symmetry of non-Hermitian graphene Dirac plasmons and its application to terahertz lasers (2022)
  • Author(s): T. Otsuji
  • Organizer: AES2022: the 8th Int. Conf. on Antennas and EM Systems Proc., vol. 1, p. 278, Marrakesh, Morocco, Hybrid, May 24-27, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Recent advances in the research of graphene plasmonic terahertz laser transistors (2022)
  • Author(s): T. Otsui, A. Satou, S.A. Boubanga-Tombet, H. Fukidome, M. Ryzhii, K. Narahara, V. Mitin, M.S. Shur, and V. Ryzhii
  • Organizer: 241st ECS Meeting, Vancouver, BC, Canada, May 29 - June 2, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Controlling the parity and time-reversal symmetry of metasurfaces in current-driven graphene Dirac plasmons (2022)
  • Author(s): T. Otsuji
  • Organizer: CIMTEC: 15th International Ceramics Congress & 9th Forum on New Materials, Conference FF: Electromagnetic Metamaterials and Metasurfaces, Perugia, Italy, June 28-30, 2022 (invited)
  • Int'l Joint Research / Invited
• [Presentation] Controlling the non-Hermitian graphene Dirac plasmons and its application to terahertz laser transistors (2022)
  • Author(s): T. Otsuji
  • Organizer: CLEO-PR: the 15th Pacific Rim Conference on Lasers and Electrooptics, CMP3B-01, Sapporo, Japan, July 31 - Aug. 5, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Asymmetric FET structure on graphene for terahertz applications (2022)
  • Author(s): C. Tang, K. Tamura, A. Satou, V. Ryzhii, and T. Otsuji
  • Organizer: TWHM: Topical Workshop on Heterostructure Microelectronics, Hiroshima, Aug. 29-30, 2022.
  • Int'l Joint Research
• [Presentation] Discovery of Coulomb-Drag Instability of Graphene Dirac Plasmons (2022)
  • Author(s): Victor Ryzhii, Maxim Ryzhii, Akira Satou, Vladimir Mitin, Michael Shur, and Taiichi Otsuji
  • Organizer: IRMMW-THz: the 47th International Conference on Infrared, Millimeter, and Terahertz Waves, We-PM2-1, Delft, Netherland, Aug. 28-Sept. 2, 2022.
  • Int'l Joint Research
• [Presentation] グラフェンFETにおけるユニポーラ動作による光熱電型高速テラヘルツ検出の実現 (2022)
  • Author(s): 田村紘一, 唐超, 荻浦大地, 諏訪健斗, 吹留博一, 佐藤昭, 瀧田佑馬, 南出泰亜, 末光哲也, 尾辻泰一
  • Organizer: 第83回応用物理学会秋季学術講演会予稿集, 21p-A202-6, 東北大学川内キャンパス, 仙台市, ハイブリッド, Sept. 21, 2022.
• [Presentation] Single-asymmetric-gated graphene field-effect transistor for terahertz applications (2022)
  • Author(s): Chao Tang, Koichi Tamura, Akira Satou, Victor Ryzhii, Taiichi Otsuji
  • Organizer: SSDM: International Conference on Solid State Devices and Materials, J-3-03, Makuhari, Tokyo, Japan, Sept. 26-29, 2022.
  • Int'l Joint Research
• [Presentation] Recent Advances in the Research of Graphene Plasmonic Terahertz Laser Transistors (2022)
  • Author(s): T. Otsuji
  • Organizer: APROPOS 18: the International Conference on Advanced Properties and Processes in Optoelectronic Materials and Systems, Vilnius, Lithuania, Oct. 5-7, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] 半導体プラズモニック機能デバイスの創出とその次世代Beyond 5Gテラヘルツ無線通信への応用 (2022)
  • Author(s): 尾辻泰一
  • Organizer: 応用物理学会薄膜・表面物理分科会主催 第51回薄膜・表面物理 基礎講座（2022）「Beyond 5Gと薄膜・表面物理の接点」, 慶応義塾大学日吉キャンパス, Oct. 31, 2022. (invited)
  • Invited
• [Presentation] グラフェンを中心とする二次元材料によるプラズモニック光デバイスの新展開 (2022)
  • Author(s): 尾辻泰一
  • Organizer: （財）光産業技術振興協会主催光材料・応用技術研究会 第三回研究会「新材料が拓くフォトニックデバイス」, エクシブ琵琶湖研修室, 滋賀県米原市（ハイブリッド）, Nov. 11, 2022. (invited)
  • Invited
• [Presentation] A distributed model of the asymmetric-gated graphene Coulomb-drag-effect transistor for terahertz applications (2022)
  • Author(s): C. Tang, K. Tamura, A. Satou, V. Ryzhii, and T. Otsuji
  • Organizer: RPGR: Recent Progress on Graphene and related 2D materials Research International Conference, Taipei, Taiwan, Nov. 13-17, 2022.
  • Int'l Joint Research
• [Presentation] Unipolar photothermoelectric THz detection assisted by Coulomb drift/diffusion of Dirac fermions in asymmetric dual-grating-gate graphene FETs (2022)
  • Author(s): K. Tamura, C. Tang, D. Ogiura, K. Suwa, H. Fukidome, Y. Takida, H. Minamide, T. Suemitsu, T. Otsuji, and A. Satou
  • Organizer: RPGR: Recent Progress on Graphene and related 2D materials Research International Conference, Taipei, Taiwan, Nov. 13-17, 2022.
  • Int'l Joint Research
• [Presentation] Zener-Klein tunneling and transit-time effects in cascade periodic graphene p-i-n structures: amplification and emission of terahertz radiation (2022)
  • Author(s): V. Ryzhii, M. Ryzhii, V. Mitin, M.S. Shur, and T. Otsuji
  • Organizer: WINDS: the Workshop on Innovative Nanoscale Devices and Systems Abstracts Booklet, Th-AM1-7, Royal Sonesta Kaua(I Resort Lifue, Hawaii, USA, Dec. 4-9, 2022.
  • Int'l Joint Research
• [Presentation] オペランド・ナノX線分光を活用した次世代高周波デバイス研究 (2022)
  • Author(s): 吹留博一
  • Organizer: MOSデバイス・メモリ・パワーデバイス高性能化－材料・プロセス技術, 名古屋大学VBL, Jun. 21, 2022, （招待講演）
  • Invited
• [Presentation] 次世代高周波デバイス応用に向けた時空間オペランドX線分光計測 (2022)
  • Author(s): 吹留博一
  • Organizer: TIA光・量子計測MG研究会（第1回研究会）, 茨城県つくば市, Sep. 1, 2022, （招待講演）
  • Invited
• [Presentation] 物性の画像情報解析を活用した Beyond 5G デバイスの動作機構解明 (2022)
  • Author(s): 山本 うらん、杉野 秀明、佐藤 駿丞、増澤 賢、渡邊 一世、小嗣 真人、吹留 博一
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学川内キャンパス, 口頭発表, 22p-M206-16, Sep.22, 2022
• [Presentation] SiC上に形成したグラフェンおよびAu/Tiから成るコプレーナ導波路の特性インピーダンスの評価 (2022)
  • Author(s): 石田 智也、佐々木 文憲、渡邊 一世、吹留 博一
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学川内キャンパス, 口頭発表, 22p-B202-14, Sep.22, 2022
• [Presentation] SiC表面におけるh-BNへのグラフェンヘテロ成長 (2022)
  • Author(s): 小濱 路生、米窪 和輝、杉野 秀明、渡邊 一世、菅原 大樹、唐 超、佐藤 昭、尾辻 泰一、吹留 博一
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学川内キャンパス, 口頭発表, 23p-B202-10, Sep. 23, 2022
• [Presentation] 機械学習を援用したグラフェンの顕微ラマンデータの自動解析法 (2022)
  • Author(s): 杉野 秀明、小濱 路生、山本 うらん、吹留 博一
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学川内キャンパス, ポスター発表, 21p-P12-16, Sep. 21, 2020
• [Presentation] High performance graphene-based devices with an affordable cost by using a wafer bonding (2022)
  • Author(s): Hirokazu Fukidome
  • Organizer: 2nd Global Conference on POLYMERS, PLASTICS AND COMPOSITES & 5th World CHEMISTRY CONFERENCE AND EXHIBITION (WCCE-2022 & PPC-2022), London/Online, Oct. 5, 2022, (invited)
  • Int'l Joint Research / Invited
• [Presentation] Spatiotemporal dynamics of electronic properties of Beyond 5G devices observed by operando x-ray nanospectroscopy (2022)
  • Author(s): Hirokazu Fukidome
  • Organizer: 14th International Symposium on Atomic Level Characterizations for New Materials and Devices '22 (ALC '22), Okinawa, 18p-2-1, Oct. 18, 2022, (invited)
  • Int'l Joint Research / Invited
• [Presentation] Operando X-ray nanospectroscopy of devices using 2D-confined electrons for Beyond 5G (2022)
  • Author(s): Hirokazu Fukidome
  • Organizer: International Conference on Materials Science, Engineering and Technology, Dubai/Online, Dec. 23, 2022, (invited)
  • Int'l Joint Research / Invited
• [Presentation] Controlling the parity and time-reversal symmetry of non-Hermitian graphene Dirac plasmons and its application to terahertz lasers (2022)
  • Author(s): T. Otsuji
  • Organizer: A3 Foresight Meeting on 2D Materials, Invite J1, Online, Feb. 17-18, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Graphene-based plasma-wave devices for terahertz applications (2022)
  • Author(s): T. Otsuji, V. Ryzhii, and M. Shur
  • Organizer: SPIE Photonics OnDemand 2022, Conference on Advances in Terahertz Biomedical Imaging and Spectroscopy, Online, Feb. 21-27, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] グラフェンのBeyond 5G超高速無線通信デバイス応用 (2022)
  • Author(s): 尾辻泰一
  • Organizer: 2022年第69回応用物理学会春季学術講演会, シンポジウム「オンライン時代の機能性マテリアル～beyond 5G/6G に向けて」, 招 24p-E201-8, オンライン, March 22-26, 2022. (invited)
  • Invited
• [Presentation] Graphene-based plasmonic metamaterial for terahertz laser transistors (2022)
  • Author(s): T. Otsuji, S. Boubanga-Tombet, A. Satou, D. Yadav, V. Ryzhii, M. Ryzhii, A.A. Dubinov, V.V. Popov, W. Knap, V. Kachorovskii, K. Narahara, V. Mitin, and M.S. Shur
  • Organizer: XXVI International Symposium on Nanophysics and Nanoelectronics, Nizhny Novgorod, Russia, Hybrid, March 14-17, 2022. (invited)
  • Int'l Joint Research / Invited
• [Presentation] SiCをプラットフォームとしたBeyond 5Gデバイスの創出とデバイス物理の探求 (2022)
  • Author(s): 吹留博一
  • Organizer: 第27回電子デバイス界面テクノロジー研究会（EDIT 27）, オンライン開催, Jan. 28-29, 2022. (invited)
  • Invited
• [Presentation] 二次元材料成膜・形成および機能発現評価の課題 (2022)
  • Author(s): 吹留博一
  • Organizer: 2022年第69回応用物理学会春季学術講演会シンポジウム「二次元材料を集積回路に」, 青山学院大学相模原キャンパス, Mar. 22-26, 2022. (invited)
  • Invited
• [Presentation] Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz lasers (2021)
  • Author(s): T. Otsuji, A. Satou, V. Ryzhii, H. Fukidome, and K. Narahara
  • Organizer: AAAFM-UCLA2021: International Conference on Advances in Functional Materials Abstract Book, Paper ID: 718, vol. 1, p. 1, UCLA, Los Angeles, CA, USA and Online, Aug. 18-20, 2021. (invited)
  • Int'l Joint Research / Invited
• [Presentation] グラフェン THz デバイスの研究開発動向と将来展望 (2021)
  • Author(s): 尾辻泰一
  • Organizer: 信学会ソサエティ大会, 企画シンポジウム：Beyond 5G、6G に向けたデバイス・材料技術とその応用, CI-5-4, pp. SS-26-27, オンライン, Sept. 14-17, 2021. (invited)
  • Invited
• [Presentation] 理論限界を超えたテラヘルツ波増幅：6G&7G超高速無線通信への可能性 (2021)
  • Author(s): 尾辻泰一
  • Organizer: レーザー学会 第2回「小型集積レーザー」専門委員会, 分子科学研究所, 愛知県岡崎市, Sept. 22, 2021. (invited)
  • Invited
• [Presentation] Controlling the parity and time-reversal symmetry of graphene Dirac plasmons and its application to terahertz current-injection lasers (2021)
  • Author(s): T. Otsuji
  • Organizer: Graphene Week 2021, online, Sept. 20-24, 2021. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Controlling the PT symmetry of graphene Dirac plasmons and its application to terahertz laser transistors (2021)
  • Author(s): T. Otsuji, A. Satou, V. Ryzhii, H. Fukidome, M. Ryzhii, and K. Narahara
  • Organizer: ICMNE: the 14th International Conference on Micro- and Nanoelectronics 2021, Zvenigorod, Moscow Region, Russia, Oct. 4-8, 2021. (invited)
  • Int'l Joint Research / Invited
• [Presentation] Coulomb drag in graphene FETs with the ballistic electron injection (2021)
  • Author(s): V. Ryzhii, M. Ryzhii, V. Mitin, M.S. Shur, and T. Otsuji
  • Organizer: RPGR: Recent Progress on Graphene and 2D materials Research Conference 2021, Seoul, South Korea (Hybrid), Oct. 7, 2021.
  • Int'l Joint Research
• [Presentation] 半導体二次元プラズモンを利用したテラヘルツ機能デバイスとその次世代 Beyond 5G無線通信への応用 (2021)
  • Author(s): 尾辻泰一
  • Organizer: 2021年日本真空表面学会学術講演会, 公募シンポジウム「表面真空科学の新分野萌芽の土壌としての Beyond 5G」, 3Aa09, Online, Nov. 3-5, 2021. (invited)
  • Invited
• [Presentation] Controlling the parity and time-reversal symmetry of non-Hermitian graphene Dirac plasmons and its application to terahertz lasers (2021)
  • Author(s): T. Otsuji, A. Satou, H. Fukidome, M. Ryzhii, V. Ryzhii, and K. Narahara
  • Organizer: WINDS: the Workshop on Innovative Nanoscale Devices and Systems, Waikoloa Beach Marriott Spa&Resort, Hawaii, USA.
  • Int'l Joint Research
• [Book] THz Communications. Springer Series in Optical Sciences, vol 234 [Plasma-Wave Devices, pp. 291-296] (2022)
  • Author(s): T. Kurner, D.M. Mittleman, and T. Nagatsuma eds. [T. Otsuji and A. Satou]
  • Total Pages: 540
  • Publisher: Springer, Cham.
  • ISBN: 9783030737375
• [Remarks] Otsuji Lab., RIEC, Tohoku Univ., Sendai, Japan
  • URL: https://www.otsuji.riec.tohoku.ac.jp/english/index_en.php
• [Patent(Industrial Property Rights)] アンテナモジュールおよびその製造方法 (2022)
  • Inventor(s): 吹留博一，末光哲也，渡邊一世，川原実，飛坂優二，秋山昌次，川合信
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Rights Type: 特許
  • Filing Date: 2022
• [Patent(Industrial Property Rights)] アンテナモジュールおよびその製造方法 (2022)
  • Inventor(s): 吹留博一，末光哲也，渡邊一世，川原実，飛坂優二，秋山昌次，川合信
  • Industrial Property Rights Holder: 東北大学、情報通信研究機構、信越化学工業（株）
  • Industrial Property Rights Type: 特許
  • Filing Date: 2022
  • Overseas
• [Patent(Industrial Property Rights)] アンテナモジュールおよびその製造方法 (2021)
  • Inventor(s): 吹留博一、末光哲也、川合信、渡邊一世
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2021-207486
  • Filing Date: 2021