Controlling edge current by irradiation of terahertz polarization-shaped pulses

• Project/Area Number: 26610079
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: University of Tsukuba
• Principal Investigator: Nomura Shintaro 筑波大学, 数理物質系, 准教授 (90271527)
• Co-Investigator(Kenkyū-buntansha): MISAWA Kazuhiko 東京農工大学, 工学研究院, 教授 (80251396)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 光照射効果 / 二次元電子系 / 半導体

Outline of Final Research Achievements

Recently developed polarization shaping method of terahertz pulses enables us to control the electric field vectors arbitrary. In this research project, we have investigated the optical excitation effects in a two-dimensional electron gas by irradiation of an optical field with polarization vector rotating in THz regime at zero external magnetic field at low temperatures. We have found that the induced photo-current is not symmetric with respect to the direction of the rotation of the polarization vector. The results of our research project should promote further investigations of symmetry breaking phenomena due to optical excitations.

Research Products

• [Journal Article] Circularly polarized near-field scanning optical microscope for investigations of edge states of a two-dimensional electron system (2015)
  • Author(s): Shintaro Nomura, Syuhei Mamyouda, Hironori Ito, Yusuke Shibata, Tomoya Ohira, Luno Yoshikawa, Youiti Ootuka, Satoshi Kashiwaya, Masumi Yamaguchi, Hiroyuki Tamura, Tatsushi Akazaki
  • Journal Title: Appl. Phys. A Volume: 121 Issue: 4 Pages: 1341-1345
  • DOI: 10.1007/s00339-015-9420-9
  • NAID: 120007135692
  • Peer Reviewed / Open Access
• [Journal Article] Imaging of current density distributions with a Nb weak-link scanning nano-SQUID microscope (2015)
  • Author(s): Y. Shibata, S. Nomura, H. Kashiwaya, S. Kashiwaya, R. Ishiguro, and H. Takayanagi
  • Journal Title: Scientific Reports Volume: 5 Issue: 1 Pages: 15097-15097
  • DOI: 10.1038/srep15097
  • NAID: 120007136144
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Circularly polarized near-field optical mapping of spin-resolved quantum Hall chiral edge states (2015)
  • Author(s): Syuhei Mamyouda, Hironori Ito, Yusuke Shibata, Satoshi Kashiwaya, Masumi Yamaguchi, Tatsushi Akazaki, Hiroyuki Tamura, Youiti Ootuka, and Shintaro Nomura
  • Journal Title: Nano Letters Volume: 15 Issue: 4 Pages: 2417-2421
  • DOI: 10.1021/nl504767w
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Spin-split and spin-unpolarized incompressible strips revealed by optical local spin injection (2015)
  • Author(s): S. Nomura, S. Mamyouda, H. Ito, Y. Shibata, Y. Ootuka, S. Kashiwaya, M. Yamaguchi, H. Tamura, and T. Akazaki
  • Organizer: International Symposium on Advanced Nanodevices and Nanotechnology
  • Place of Presentation: Hilton Waikoloa Village (USA)
  • Year and Date: 2015-11-29
  • Int'l Joint Research
• [Presentation] 光誘起端状態の検出に向けて (2015)
  • Author(s): 野村晋太郎
  • Organizer: 東北大学電気通信研究所共同プロジェクト研究会
  • Place of Presentation: ベルサンピアみやぎ泉（宮城県黒川郡大和町）
  • Year and Date: 2015-10-08
• [Presentation] ベクトル電場波形整形パルスの生成と物質制御への応用 (2015)
  • Author(s): 三沢和彦
  • Organizer: 東北大学電気通信研究所共同プロジェクト研究会
  • Place of Presentation: ベルサンピアみやぎ泉（宮城県黒川郡大和町）
  • Year and Date: 2015-10-08
  • Invited
• [Presentation] Photoconductivity measurements of bach-gated MoS2 photodetectors (2015)
  • Author(s): A. Saito, R. Kimura, H. Watanabe, and S. Nomura
  • Organizer: Interdisciplinary Workshop on Science and Patents (IWP) 2015
  • Place of Presentation: Univ. Tsukuba（茨城県つくば市）
  • Year and Date: 2015-09-04
  • Int'l Joint Research
• [Presentation] High photoresponsivity MoS2 photodetectors by chemical doping technique (2015)
  • Author(s): H. Watanabe, C. Tsukamoto, and S. Nomura
  • Organizer: 21st International Conference on Electronic Properties of Two-Dimensional Systems
  • Place of Presentation: 仙台国際会議場（宮城県仙台市）
  • Year and Date: 2015-07-26
  • Int'l Joint Research
• [Presentation] GaAs単一ヘテロ接合ホールバーへのベクトル波形整形波照射効果 (2015)
  • Author(s): 大嶋勇輝、伊東駿、野村晋太郎，三沢和彦
  • Organizer: 日本物理学会第70回年次大会
  • Place of Presentation: 早稲田大学
  • Year and Date: 2015-03-21 – 2015-03-24
• [Remarks] Nomura Laboratory, University of Tsukuba
  • URL: http://www.px.tsukuba.ac.jp/~snomura/