Single photon sources based on two-dimensional semiconductors

• Project/Area Number: 21K18930
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 32:Physical chemistry, functional solid state chemistry, and related fields
• Research Institution: Nagoya University
• Principal Investigator: Kitaura Ryo 名古屋大学, 理学研究科, 特任准教授 (50394903)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2021: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: 二次元半導体 / 結晶成長 / 光物性 / 高精度ドーピング / 発光特性 / 単一光子光源 / 固体物性

Outline of Research at the Start

本研究では、「高輝度・室温動作・低損失波長帯動作を兼ね備えた新しい単一光子光源」を 開発することに挑戦する。1パルス中に含まれる光子が１個に制限された単一光子発光源(SPE)は、量子力学基礎に関する研究や量子暗号通信の実現に不可欠である。とくに、量子暗号通信の実現には、"高輝度・室温動作・光ファイバー低損失波長帯"を併せ持ったSPEが必要となるが、いまだにこの3つのポイント全てを満たすSPEを制御して作り出すことは極め て困難である。本研究では優れた特性を有する二次元半導体を対象に、申請者オリジナルの 新技術（自在原子置換法）を適用することで、この現状を打破する全く新しいSPEを創出することに挑戦する。

Outline of Final Research Achievements

In this study, we developed a method to control and embed luminescent centers into two-dimensional semiconductors. For example, we succeeded in substituting W and Mo into WSe2 and MoSe2, respectively, and directly embedding zero-dimensional local structures into two-dimensional crystals using a crystal growth method. By examining the optical properties of the fabricated samples in detail, we found that new optical transitions that were not observed in the parent structure appeared, and these are considered to be optical transitions derived from the embedded luminescent centers. Through this study, we succeeded in developing material technology that serves as the foundation for developing single-photon sources based on two-dimensional semiconductors, and further investigation is expected to proceed quickly in the future.

Academic Significance and Societal Importance of the Research Achievements

二次元半導体に元素をドーピングする技術は、バルク半導体と比して立ち遅れている。本研究で開発した手法は、発光中心の埋込を通した単一光子光源の実現へとつながるのみならず、二次元半導体を用いたナノデバイス作製の基本技術となる可能性を秘めたものである。また、二次元半導体にナノスケール局所構造を直接埋め込む手法はまったく新規なものであり、単一光子光源にとどまらず幅広い量子機能の発現にもつながると期待される。

Research Products

• [Journal Article] Field-effect transistor antigen/antibody-TMDs sensors for the detection of COVID-19 samples (2023)
  • Author(s): Canton-Vitoria Ruben、Sato Kotaro、Motooka Yashiro、Toyokuni Shinya、Liu Zheng、Kitaura Ryo
  • Journal Title: Nanoscale Volume: 15 Issue: 9 Pages: 4570-4580
  • DOI: 10.1039/d2nr06630k
• [Journal Article] Observation of the photovoltaic effect in a van der Waals heterostructure (2023)
  • Author(s): Zhang Shaochun、Maruyama Mina、Okada Susumu、Xue Mengsong、Watanabe Kenji、Taniguchi Takashi、Hashimoto Kazuki、Miyata Yasumitsu、Canton-Vitoria Ruben、Kitaura Ryo
  • Journal Title: Nanoscale Volume: 15 Issue: 12 Pages: 5948-5953
  • DOI: 10.1039/d2nr06616e
  • Peer Reviewed
• [Journal Article] Formation of a one-dimensional hole channel in MoS2 by structural corrugation (2023)
  • Author(s): Gao Yanlin、Nakajima Haruna、Maruyama Mina、Taniguchi Takashi、Watanabe Kenji、Kitaura Ryo、Okada Susumu
  • Journal Title: Japanese Journal of Applied Physics Volume: 62 Issue: 1 Pages: 015001-015001
  • DOI: 10.35848/1347-4065/acaae0
  • Peer Reviewed
• [Journal Article] Synthesis and Characterization of Transition Metal Dichalcogenide Nanoribbons Based on a Controllable O2 Etching (2023)
  • Author(s): Canton-Vitoria Ruben、Hotta Takato、Xue Mengsong、Zhang Shaochun、Kitaura Ryo
  • Journal Title: JACS Au Volume: 3 Issue: 3 Pages: 775-784
  • DOI: 10.1021/jacsau.2c00536
• [Journal Article] An observation of a photovoltaic effect in MoS2 nanoribbons fabricated with a top-down approach (2023)
  • Author(s): Zhang Shaochun、Xue Mengsong、Zeng Fanyu、Kitaura Ryo
  • Journal Title: Applied Physics Express Volume: 16 Issue: 3 Pages: 035003-035003
  • DOI: 10.35848/1882-0786/acbf9f
• [Journal Article] Trion confinement in monolayer MoSe2 by carbon nanotube local gating (2022)
  • Author(s): Hotta Takato、Nakajima Haruna、Chiashi Shohei、Inoue Taiki、Maruyama Shigeo、Watanabe Kenji、Taniguchi Takashi、Kitaura Ryo
  • Journal Title: Applied Physics Express Volume: 16 Issue: 1 Pages: 015001-015001
  • DOI: 10.35848/1882-0786/aca642
• [Journal Article] Interlayer Interactions in 1D Van der Waals Moire Superlattices (2021)
  • Author(s): Sihan Zhao, Ryo Kitaura, Pilkyung Moon, Mikito Koshino, Feng Wang
  • Journal Title: Adv. Sci. Volume: 9 Issue: 2 Pages: 2103460-2103460
  • DOI: 10.1002/advs.202103460
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Continuous Fermi level tuning of Nb-doped WSe2 under an external electric field (2021)
  • Author(s): Hisama Kaoru、Gao Yanlin、Maruyama Mina、Kitaura Ryo、Okada Susumu
  • Journal Title: Japanese Journal of Applied Physics Volume: 61 Issue: 1 Pages: 015002-015002
  • DOI: 10.35848/1347-4065/ac3726
  • NAID: 120007193866
  • Peer Reviewed
• [Journal Article] Identification of the position of piezoelectric polarization at the MoS2/metal interface (2021)
  • Author(s): Umeda Masaya、Higashitarumizu Naoki、Kitaura Ryo、Nishimura Tomonori、Nagashio Kosuke
  • Journal Title: Applied Physics Express Volume: 14 Issue: 12 Pages: 125002-125002
  • DOI: 10.35848/1882-0786/ac3d1f
  • Peer Reviewed / Open Access
• [Journal Article] A Versatile Post-Doping Towards Two-Dimensional Semiconductors (2021)
  • Author(s): Yuya Murai, Shaochun Zhang, Takato Hotta, Zheng Liu, Takahiko Endo, Hiroshi Shimizu, Yasumitsu Miyata, Toshifumi Irisawa, Yanlin Gao, Mina Maruyama, Susumu Okada, Hiroyuki Mogi, Tomohiro Sato, Shoji Yoshida, Hidemi Shigekawa, Takashi Taniguchi, Kenji Watanabe, Canton-Vitoria Ruben, Ryo Kitaura
  • Journal Title: ACS Nano Volume: 2021,15,12 Issue: 12 Pages: 19225-19232
  • DOI: 10.1021/acsnano.1c04584
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Femtosecond photoluminescence from monolayer MoSe2 : Time-domain study on exciton diffusion (2021)
  • Author(s): K Saito, M Okada, R Kitaura, H Kishida, T Koyama
  • Journal Title: Physical Review B Volume: 103 Issue: 20
  • DOI: 10.1103/physrevb.103.l201401
  • Peer Reviewed
• [Presentation] Fabrication and optical properties of 2D-semiconductor-based heterostructures (2022)
  • Author(s): Kitaura Ryo
  • Organizer: The 12th Symposium on Emerging materials
  • Int'l Joint Research / Invited
• [Presentation] Heterostructures based on two-dimensional semiconductors (2022)
  • Author(s): Kitaura, Ryo
  • Organizer: SSDM
  • Int'l Joint Research / Invited
• [Presentation] An exploration of lateral/vertical van der Waals heterostructures (2022)
  • Author(s): Kitaura, Ryo
  • Organizer: OPA-JSAP symposium
  • Int'l Joint Research / Invited
• [Presentation] An investigation of photovoltaic effects in two-dimensional systems (2022)
  • Author(s): Shaochun Zhang and Ryo Kitaura
  • Organizer: Nanocarbon research meeting
  • Invited
• [Presentation] Ultrathin Lateral Heterostructures Based on Two-Dimensional Semiconductors (2022)
  • Author(s): Kitaura, Ryo
  • Organizer: 241st ECS Meeting: B04 – 2D Materials in Japan
  • Int'l Joint Research / Invited
• [Presentation] 二次元系をベースとした混合次元系への展開 (2021)
  • Author(s): 北浦良
  • Organizer: 第16回酸化グラフェン研究会
  • Invited
• [Presentation] An exploration of mix-dimensional structures (2021)
  • Author(s): Kitaura, Ryo
  • Organizer: the International Workshop on Materials Science
  • Int'l Joint Research / Invited
• [Presentation] An exploration of mix-dimensional systems (2021)
  • Author(s): Kitaura, Ryo
  • Organizer: MANA Special Seminar
  • Int'l Joint Research / Invited
• [Presentation] Two-dimensional ultrathin lateral heterostructures (2021)
  • Author(s): Kitaura, Ryo
  • Organizer: The 11th A3 symposium on emerging materials
  • Int'l Joint Research / Invited