Last update:4/8/2020
Research topics
Publication list
Group members


Since 7/6/2007

Quantum Solid State Physics Research Group studies quantum correlated phenomena in semiconductor nanostructures. Our topics include spin and charge dynamics in quantum dots formed in GaAs, Si or carbon based materials, electric properties of two-dimensional systems in GaAs/AlGaAs or Si/SiO2 heterostructures and the characterization of semiconductor surfaces using low-temperature scanning probe microscopies. Facilities we use include molecular beam epitaxy, electron beam lithography, low-temperature scanning tunnel microscopy with MBE chamber systems and several cryostats.
News and recent selected publications
  • 13/5/2020, "Suppression of gate screening on edge magnetoplasmons by highly resistive ZnO gate",
    N. Kumada, N. H. Tu, K. Sasaki, T. Ota, M. Hashisaka, S. Sasaki, K. Onomitsu, and K. Muraki:
    Phys Rev. B 101, 205205 (2020).

  • 28/2/2020, "Impact of epitaxial strain on the topological-nontopological phase diagram and semimetallic behavior of InAs/GaSb composite quantum wells",
    H. Irie, T. Akiho, F. Couedo, R. Ohana, K. Suzuki, K. Onomitsu and K. Muraki:
    Phys Rev. B 101, 075433 (2020).

  • 4/2/2020, "Active spatial control of terahertz plasmons in graphene",
    Ngoc Han Tu, Katsumasa Yoshioka, Satoshi Sasaki, Makoto Takamura, Koji Muraki and Norio Kumada
    Commun Mater 1, 7 (2020).

  • 22/1/2020, "Two-step breakdown of a local ν=1 quantum Hall state",
    Masayuki Hashisaka, Koji Muraki, and Toshimasa Fujisawa
    Phys. Rev. B 101, 041303(R) (2020).

  • 18/12/2019, "Tunneling spectroscopy of an indium adatom precisely manipulated on the cross-sectional surface of InAs/GaSb quantum structures",
    K. Suzuki, K. Onomitsu, and K. Kanisawa
    Phys. Rev. B 100, 235306 (2019).

  • 8/11/2019, "Quantum Rings Engineered by Atom Manipulation",
    Van Dong Pham, Kiyoshi Kanisawa, and Stefan Folsch
    Phys. Rev. Lett. 123, 066801 (2019).

  • 9/10/2019, "Efficient gate control of spin–orbit interaction in InSb nanowire FET with a nearby back gate",
    Keiko Takase, Kouta Tateno and Satoshi Sasaki
    Appl. Phys. Express 12, 117002 (2019).

  • 1/10/2019, New internship student: Colin Piquard

  • 1/10/2019, New internship student: Takase Shimizu

  • 2/9/2019, New research specialist: Taro Wakamura

  • 30/8/2019, Lee Sanghyun finished his internship at NTT.

  • 13/7/2019, Thibaut Jonckheere finished at NTT.

  • 28/6/2019, Moved to RIKEN: Ngoc Han Tu

  • 31/5/2019, ""Charge equilibration in integer and fractional quantum Hall edge channels in a generalized Hall-bar device",
    C. Lin,R. Rguchi, M. Hashisaka, T. Akiho, K. Muraki and T. Fujisawa,
    Phys. Rev. B 99, 195304 (2019)

  • 21/5/2019, "Determination of g-factor in InAs two-dimensional electron system by capacitance spectroscopy",
    H. Irie, T. Akiho and K. Muraki
    Appl. Phys. Express 12, 063004 (2019).

  • 21/5/2019, Invited professor: Thibaut Jonckheere

  • 13/5/2019, New internship student: Lee Sanghyun

  • 22/4/2019, "Surface-acoustic-wave resonators with Ti, Cr, and Au metallization on GaAs",
    R. Takasu, Y. Sato, T. Hata, T. Akiho, K. Muraki and T. Fujisawa,
    Appl. Phys. Express 12, 055001 (2019).

  • 1/4/2019, New Staff: Katsumasa Yoshioka

  • 29/3/2019, Dyon van Dinter finished his internship at NTT.

  • 28/3/2019, "Counterflowing edge current and its equilibration in quantum Hall devices with sharp edge potential: Roles of incompressible strips and contact configuration",
    T. Akiho, H. Irie, K. Onomitsu and K. Muraki,
    Phys. Rev. B 99, 121303(R) (2019).

  • 28/3/2019, "Spectroscopic study on hot-electron transport in a quantum Hall edge channel",
    T. Ota, S. Akiyama, M. Hashisaka, K. Muraki and T. Fujisawa,
    Phys. Rev. B 99, 085310 (2019).

3-1 Morinosato-Wakamiya, Atugi, Kanagawa 243-0198, Japan
Qauntum Solid State Physics Research Group
NTT Basic Research Laboratories