Low Temperature Physics Laboratory

We study quantum phenomena in the system from nano to macroscopic scale at low and ultra-low temperatures. 1) Quantum properties of low dimensional systems consisting of electrons, ions and atomic hydrogen formed on the helium surface: Recent research topics include transport properties of the 2D Wigner solid, transport of microwave excited 2D electrons, transport of an ion pool, flow of adsorbed 3He film, and properties of solid He. Rotating cryostat and ultra-low temperature cryostat are used. In addition, we develop manipulation of single electrons on liquid He. 2) We study quantum electron/spin correlation in nano-scale systems, for example, metal and semiconductor quantum dots with the use of nano-fabrication techniques. Device application and quantum information processing are also in our scope.

Research Subjects

• Development of nano-scale electronic devices and physics of electrons and spins
• Non-equilibrium phenomena in electrons on liquid He
• Free Surface and boundary effect in superfluid 3He
• Manipulation of single electrons on liquid helium surface
• Solid Helium

Publications

1. M. Kawamura, D. Gottwald, K. Ono, T. Machida, and K. Kono:
   "Evidence for Reentrant Melting in a Quasi-One-Dimensional Wigner Crystal"
   Phys. Rev. Lett. 109, 236802 (2012) [5 pages]
2. D. G. Rees, H. Totsuji, and K. Kono:
   "Commensurability-Dependent Transport of a Wigner Crystal in a Nanoconstriction"
   Phys. Rev. Lett. 108, 176801 (2012) [5 pages]
3. D. G. Rees, I. Kuroda, C. A. Marrache-Kikuchi, M. Höfer, P. Leiderer, and K. Kono:
   "Point-Contact Transport Properties of Strongly Correlated Electrons on Liquid Helium"
   Phys. Rev. Lett. 106, 026803 (2011) [4 pages]
4. R. Takahashi, K. Kono, S. Tarucha, and K. Ono
   "Voltage-Selective Bidirectional Polarization and Coherent Rotation of Nuclear Spins in Quantum Dots"
   Phys. Rev. Lett. 107, 026602 (2011) [4 pages]
5. Konstantinov D. and Kono K.:
   "Photon-Induced Vanishing of Magnetoconductance in 2D Electrons on Liquid Helium"
   Phys. Rev. Lett. 105, 226801 (2010) [4 pages]
6. Choi H, Takahashi D, Kono K, and Kim E.:
   "Evidence of Supersolidity in Rotating Solid Helium"
   Science 330 (2010) 1512-1515
7. Huang SM, Tokura Y, Akimoto H, Kono K, Lin JJ, Tarucha S, and Ono K:.
   "Spin Bottleneck in Resonant Tunneling through Double Quantum Dots with Different Zeeman Splittings"
   Phys. Rev. Lett. 104, 136801 (2010) [4 pages]
8. Konstantinov D, Dykman MI, Lea MJ, Monarkha YP, and Kono K.:
   "Resonant Correlation-Induced Optical Bistability in an Electron System on Liquid Helium"
   Phys. Rev. Lett. 103, 096801 (2009) [4 pages]
9. Ikegami H, Akimoto H, and Kono K.:
   "Nonlinear Transport of the Wigner Solid on Superfluid 4He in a Channel Geometry"
   Phys. Rev. Lett. 102, 046807 (2009) [4 pages]