Semba, Kouichi

Updated June 9, 2005.

Degree

B.S. in physics, University of Tokyo, 1983.
M.S. in physics, University of Tokyo, 1985.
D.E. in superconductivity, University of Tokyo, 2002.
A member of NTT basic research laboratories since 1987

Fields of Interest

I am interested in physics of
  • superconducting Josephson qubits interacting with its environment
  • strongly correlated electronic systems near the quantum critical point
  • novel superconductors, low dimensional electronic system
  • quasicrystals

    • Recent Papers

  • Coherent Control of a Flux Qubit by Phase-Shifted Resonant Microwave Pulses
    • T, Kutsuzawa, H. Tanaka, S. Saito, H. Nakano, K. Semba, and H. Takayanagi
    Appl. Phys. Lett. 87, 073501 (2005). DOI: 10.1063/1.2010610
  • All-MgB2 Josephson tunnel junctions
    • K. Ueda, S. Saito, K. Semba, T. Makimoto, and M. Naito
    Appl. Phys. Lett. 86, 1 (2005). DOI: 10.1063/1.1920411
  • Detection of a persistent-current qubit by resonant activation
    • P. Bertet, I. Chiorescu, K. Semba, C. J. P. M. Harmans, and J. E. Mooij,
    Phys. Rev. B 70, 100501(R) (2004), DOI:10.1103/PhysRevB.70.100501
  • Coherent dynamics of a flux qubit coupled to a harmonic oscillator
    • I. Chiorescu, P. Bertet, K. Semba, Y. Nakamura, C. J. P. M. Harmans & J. E. Mooij,
    Nature 431, 159-162 (2004); DOI:10.1038/nature02831.
  • Multiphoton Transitions in a Macroscopic Quantum Two-State System
    • S. Saito, M. Thorwart, H. Tanaka, M. Ueda, H. Nakano, K. Semba, and H. Takayanagi,
    Phys. Rev. Lett. 93, 037001 (2004)
  • Superconductor-to-Insulator Transition and Transport Properties of Underdoped YBa2Cu3O6+x
    • K. Semba, A. Matsuda,
    Phys. Rev. Lett. 86, 496-499 (2001)
  • Transport Property and Quantum Critical Point of Underdoped YBa2Cu3O6+x
    • K. Semba, A. Matsuda, and M. Mukaida
    Proceedings of Mass and Charge Transport in Inorganic Materials: Fundamentals to Devices,
    Part A p.121-128, 2000. P. Vincenzini and V. Buscaglia (Editors), Techna Srl, Italy 2000.
  • Carrier-concentration-driven superconductor-to-insulator transition in YBa2Cu3O6+x
    • K. Semba, A. Matsuda, and M. Mukaida,
    Physica B 281&282 2000 p.904-905
  • Vanishingly small Maki-Thompson superconducting fluctuation in the magnetoresistance of high-Tc superconductors
    • K. Semba, A. Matsuda,
    Phys. Rev. B vol.55 no.17 1997 p.11103-11106
  • Infrared reflectivity of untwinned YBa2(Cu1-xZnx)3O7-d single crystals
    • H. Shibata, K. Semba, A. Matsuda, T. Yamada,
    Phys. Rev. B vol.51 no.14 1995 p.9294-9347
  • Normal and superconductive properties of Zn-substituted single-crystal YBa2(Cu1-xZnx)3O7-d
    • K. Semba, A. Matsuda, T. Ishii,
    Phys. Rev. B vol.49 no.14 1994 p.10043-10046
  • Anisotropy and impurity effect in high Tc superconductors
    • A. Matsuda, K. Semba, T. Watanabe,
    Physica C (M2SHTSC IV, '94, Pt.2) vol.235-240 1994 p.1395-1396
  • Absence of the Zeeman effect on the Maki-Thompson fluctuation in magnetoresistance of YBa2Cu3O7 single crystals
    • K. Semba, T. Ishii, A. Matsuda,
    Phys. Rev. Lett. vol.67 no.6 1991 p.769-772 Erratum: Vol.67, No.15, 1991, p2114
  • Polarizing Microscopic Observation of the Superconducting Eu1Ba2Cu3Oy Crystals
    • K. Semba, H. Suzuki, A. Katsui, Y. Hidaka, M. Hikita, S. Tsurumi,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.10 1987 p.L1645-L1647
  • The 123 Structure -- Its Identification, Isolation and Universality
    • S. Kurihara, S. Tsurumi, M. Hikita, T. Iwata, K. Semba, J. Noda,
    Proc. Sympo. Mater. Res. Soc. Spring Meeting, Anaheim, 1987
  • High Tc superconductivities of A2Ba4Cu6O14+y
    • S. Tsurumi, M. Hikita, T. Iwata, K. Semba, S. Kurihara,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.5 1987 p.L856-L857
  • High-Tc superconductivities of (Y1-xYbx)2Ba4Cu6O14+y (0< y<2.5)
    • S. Tsurumi, M. Hikita, T. Iwata, K. Semba,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.5 1987 p.L704-L705
  • Electron probe micro analysis for multi-phase superconducting Y-Ba-Cu-O compound system
    • T. Iwata, M. Hikita, K. Semba, S. Tsurumi,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.5 1987 p.L647-L648
  • Oxygen-defect perovskite structure with superconducting Tc above 50 K in La-Ba-Cu-O compound system
    • M. Hikita, S. Tsurumi, K. Semba, T. Iwata, S. Kurihara,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.5 1987 p.L615-L616
  • Novel high-Tc superconducting phase of the Y-Ba-Cu-O compound
    • K. Semba, S. Tsurumi, M. Hikita, T. Iwata, J. Noda, S. Kurihara,
    Jpn. J. Appl. Phys. Pt.2 vol.26 no.4 1987 p.L429-L431
  • Electronic state of topologically disordered system. (in Japanese)
    (Electronic state on the Penrose's non-periodic tiling)
    • K. Semba, Master Thesis, Physics Department, University of Tokyo 1985.

    Superconducting Quantum Physics Research Group
    The Physical Science Laboratory
    NTT Basic research Labs.
    3-1, Morinosato Wakamiya
    Atsugi-shi, Kanagawa 243-0198, Japan
    Tel: +81-462-40-3544
    Fax: +81-462-70-2364
    Kouichi Semba/NTT Basic Research Labs. /