Centers & Labs

RIKEN Center for Emergent Matter Science

Quantum Condensed Phases Research Team

Team Leader: Kimitoshi Kono (D.Sci.)
Kimitoshi  Kono(D.Sci.)

We will develop techniques to manipulate single electrons and ions trapped at an extremely clean surface of liquid helium, which will be utilized to fabricate quantum effect devices. This includes lateral confinement techniques and control of quantum transitions between discrete energy levels due to the abovementioned confinement and due to surface states. In addition, superfluidity, a typical emergent phenomenon, will be studied in the context of topological properties associated with a spontaneous symmetry breaking.

Main Research Field


Research Subjects

  • Single electron transport on a surface of liquid helium
  • Anomalous transport phenomena of electrons on helium liquids under microwave irradiation
  • Laser spectroscopy of metal atoms and ions in superfluid helium

Selected Publications

  1. Chepelianskii A., Watanabe M., Nasyedkin K.:
    Kono K., and Konstantinov D.:
    "An incompressible state of a photo-excited electron gas"
    Nature Communications 6, 7210 (2015).
  2. Ikegami H., Tsutsumi Y., and Kono K.:
    "Observation of Intrinsic Magnus Force and Direct Detection of Chirality in Superfluid 3He-A"
    J. Phys. Soc. Jpn. 84, 44602 (2015).
  3. Kawamura M., Ono K., Stano P.:
    Kono K., and Aono T.:
    "Electronic Magnetization of a Quantum Point Contact Measured by Nuclear Magnetic Resonance"
    Phys. Rev. Lett. 115, 36601 (2015).
  4. Y. Kondo, S. Amaha, K. Ono:
    Kono K., and TaruchaS:
    "Critical Behavior of Alternately Pumped Nuclear Spins in Quantum Dots"
    Phys. Rev. Lett. 115, 186803 (2015).
  5. Konstantinov D., Monarkha Yu., and Kono K.:
    "Effect of Coulomb Interaction on Microwave-Induced Magnetoconductivity Oscillations of Surface Electrons on Liquid Helium"
    Phys. Rev. Lett. 111, 266802 (2013).
  6. Ikegami H., Chung S. B., and Kono K.:
    "Mobility of Ions Trapped Below a Free Surface of Superfluid 3He"
    J. Phys. Soc. Jpn. 82, 124607 (2013).
  7. Ikegami H., Tsutsumi Y., and Kono K.:
    "Chiral Symmetry Breaking in Superfluid 3He-A"
    Science 341, 59-62. (2013)
  8. Ikegami, H., Akimoto, H., Rees D. G.:
    And Kono, K.:
    "Evidence for Reentrant Melting in a Quasi-One-Dimensional Wigner Crystal"
    Phys. Rev. Lett. 109, 236802 (2012).
  9. Rees, D. G., Totsuji, H., and Kono, K.:
    "Commensurability-Dependent Transport of a Wigner Crystal in a Nanoconstriction"
    Phys. Rev. Lett. 108, 176801 (2012).
  10. Rees D. G., Kuroda I., Marrache-Kikuchi C. A.:
    Höfer M., Leiderer P., and Kono K.:
    "Point-Contact Transport Properties of Strongly Correlated Electrons on Liquid Helium"
    Phys. Rev. Lett. 106, 026803 (2011) [4 pages]

Lab Members

Principal Investigator

Kimitoshi Kono
Team Leader

Core Members

Petr Moroshkin
Research Scientist
Yu-Chen Sun
Postdoctoral Researcher
Daisuke Sato
Postdoctoral Researcher
Kostyantyn Nasyedkin
Postdoctoral Researcher
Yuichi Okuda
Temporary Employee
Tomoya Tsuiki
Junior Research Associate

Contact information

S-302, Chemistry and Materials Physics Building, 2-1 Hirosawa, Wako, Saitama
351-0198, Japan
Tel: +81-(0)48-467-9327
Fax: +81-(0)48-462-4652

Email: kkono [at]

Related links

Recent research results

July 22, 2016: RIKEN RESEARCH
Friction-like effect observed in quantum system