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

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering


  • Superfluid helium
  • Surface state electrons on liquid helium
  • Ions trapped under the surface of helium
  • Symmetry breaking
  • Ultralow temperature experiment

Selected Publications

  1. Moroshkin, P., Leiderer, P., Moeller, Th. B., and Kono, K.;
    "Taylor cone and electrospraying at a free surface of superfluid helium charged from below"
    Phys. Rev. E 95, 053110 [9 pages] (2017).
  2. Moroshkin, P., Leiderer, P., and Kono, K.;
    "Motion of metallic microparticles in superfluid helium in the presence of space charge"
    Physics of Fluids 29, 047106 [10 pages] (2017).
  3. Saitoh, M., Ikegami, H., and Kono, K.;
    "Onset of Superfluidity in 3He Films"
    Phys. Rev. Lett. 117, 205302 [5 pages] (2016).
  4. Rees, D. G., Beysengulov, N. R., Lin, J.-J., and Kono, K.;
    "Stick-Slip Motion of the Wigner Solid on Liquid Helium"
    Phys. Rev. Lett. 116, 206801 [5 pages] (2016).
  5. Rees, D. G., Beysengulov, N. R., Teranishi, Y., Tsao, C.-S., Yeh, S.-S., Chiu, S.-P., Lin, Y.-H., Tayurskii, D. A., Lin, J.-J., and Kono, K.;
    "Structural order and melting of a quasi-one-dimensional electron system"
    Phys. Rev. B 94, 045139 [6 pages]. (2016).
  6. Moroshkin, P. and Kono, K.;
    "Bound-bound transitions in the emission spectra of Ba$^+$-He excimer"
    Phys. Rev. A 93, 052510 [6 pages] (2016)
  7. Moroshkin, P., Batulin, R., Leiderer, P., and Kono, K.;
    "Metallic nanowires and mesoscopic networks on a free surface of superfluid helium and charge-shuttling across the liquid-gas interface"
    Phys. Chem. Chem. Phys., 18, 26444-26455 (2016)
  8. 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 [5 pages] (2013).
  9. 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 [12 pages] (2013).
  10. Ikegami, H., Tsutsumi, Y., and Kono, K.;
    "Chiral Symmetry Breaking in Superfluid 3He-A"
    Science 341, 59-62. (2013)

Lab Members

Principal Investigator

Kimitoshi Kono
Team Leader

Core Members

Petr Moroshkin
Research Scientist
Yuichi Okuda
Temporary Employee

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