Quantum dots
Nanowire
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>>Quantum dots/Nanowire
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Quantum Dots/Nanowire
We investigate single-electron transport, correlated transport, and time-dependent phenomena in quantum dots (GaAs, Si, carbon based molecules, etc.). We are developing quantum information technology based on electron charge and spin.
Figure: Correlated Coherent Oscillations in Coupled Semiconductor Charge Qubits [Phys. Rev. Lett. 103, 056802 (2009)].

Selected publications
  • Single-electron dynamics and qubit
    • Wide-band capacitance measurement on a semiconductor double quantum dot for studying tunneling dynamics
      Takeshi Ota, Toshiaki Hayashi, Koji Muraki and Toshimasa Fujisawa
      Appl. Phys. Lett. 96, 032104 (2010).

    • Correlated Coherent Oscillations in Coupled Semiconductor Charge Qubits
      G. Shinkai, T. Hayashi, T. Ota, and T. Fujisawa
      Phys. Rev. Lett. 103, 056802 (2009).

    • Controlled resonant tunneling in a coupled double-quantum-dot system
      G. Shinkai, T. Hayashi, Y. Hirayama, and T. Fujisawa
      Appl. Phys. Lett. 90, 103116 (2007).

    • Bidirectional counting of single electrons
      Toshimasa Fujisawa, T. Hayashi, R. Tomita, Y. Hirayama
      Science 312, 1634 (2006).

    • Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot
      S. Sasaki, T. Fujisawa, T. Hayashi, and Y. Hirayama
      Phys. Rev. Lett. 95, 056803 (2005).

    • Coherent manipulation of electronic states in a double quantum dot
      T. Hayashi, T. Fujisawa, H. D. Cheong, Y. H. Jeong, and Y. Hirayama
      Phys. Rev. Lett. 91, 226804 (2003).

    • Allowed and forbidden transitions in artificial hydrogen and helium atoms
      T. Fujisawa, D. G. Austing, Y. Tokura, Y. Hirayama, and S. Tarucha
      Nature 419, 278 (2002).

  • Kondo effect
    • Spin-orbital Kondo effect in a parallel double quantum dot
      Yuma Okazaki, Satoshi Sasaki, and Koji Muraki
      Phys. Rev. B 84, 161305(R) (2011).

    • Fano-Kondo Interplay in a Side-Coupled Double Quantum Dot
      S. Sasaki, H. Tamura, T. Akazaki, and T. Fujisawa
      Phys. Rev. Lett. 103, 266806 (2009).

    • Non-local control of the Kondo effect in a double quantum dot-quantum wire coupled system
      S. Sasaki, S. Kang, K. Kitagawa, M. Yamaguchi, S. Miyashita, T. Maruyama, H. Tamura, T. Akazaki, Y. Hirayama, and H. Takayanagi
      Phys. Rev. B 73, 161303(R) (2006).

    • Enhanced Kondo Effect via Tuned Orbital Degeneracy in a Spin-1/2 Artificial Atom
      S. Sasaki, T. Fujisawa, T. Hayashi, and Y. Hirayama
      Phys. Rev. Lett. 93, 17205 (2004).

    • Kondo effect in an integer-spin quantum dot
      S. Sasaki, S. De Franceschi, J. Elzerman, W. van der Wiel, M. Eto, S. Tarucha, and L. P. Kouwenhoven
      Nature 405, 764 (2000).

  • Nanowire
    • Encapsulated gate-all-around InAs nanowire field-effect transistors
      Satoshi Sasaki, Kouta Tateno, Guoqiang Zhang, Henri Suominen, Yuichi Harada, Shiro Saito, Akira Fujiwara, Tetsuomi Sogawa, and Koji Muraki
      Appl. Phys. Lett. 103, 213502 (2013).

  • Molecular electronics
    • Room-temperature stability of Pt nanogaps formed by self-breaking
      F. Prins, T. Hayashi, B. J. A. de Vos van Steenwijk, B. Gao, E. A. Osorio, K. Muraki, and H. S. J. van der Zant
      Appl. Phys. Lett. 94, 123108 (2009).

  • Other topics for GaAs quantum dot
    • Intrinsic and extrinsic origins of low-frequency noise in GaAs/AlGaAs Schottky-gated nanostructures
      Kenichi Hitachi, Takeshi Ota, and Koji Muraki
      Appl. Phys. Lett. 102, 192104 (2013).

    • Shot noise spectroscopy on a semiconductor quantum dot in the elastic and inelastic cotunneling regimes
      Yuma Okazaki, Satoshi Sasaki, and Koji Muraki
      Phys. Rev. B 87, 041302(R) (2013).

    • Observation of Hysteretic Transport due to Dynamic Nuclear Spin Polarization in a GaAs Lateral Double Quantum Dot
      Takashi Kobayashi, Kenichi Hitachi, Satoshi Sasaki, and Koji Muraki
      Phys. Rev. Lett. 107, 216802 (2011).

  • Carbon nanotube and Si quantum dots
    • Gate-Dependent Orbital Magnetic Moments in Carbon Nanotubes
      T. S. Jespersen, K. Grove-Rasmussen, K. Flensberg, J. Paaske, K. Muraki, T. Fujisawa, and J. Nygård
      Phys. Rev. Lett. 107, 186802 (2011).

    • Gate-dependent spin-orbit coupling in multielectron carbon nanotubes
      T. S. Jespersen, K. Grove-Rasmussen, J. Paaske, K. Muraki, T. Fujisawa, J. Nygard and K. Flensberg
      Nature Phys. 7, 348 (2011).

    • A Triple Quantum Dot in a Single-Wall Carbon Nanotube
      K. Grove-Rasmussen, H. I. J&orgensen, T. Hayashi, P. E. Lindelof, and T. Fujisawa
      Nano Lett. 8, 1055 (2008).

    • Pauli-spin-blockade transport through a silicon double quantum dot
      H. W. Liu, T. Fujisawa, Y. Ono, H. Inokawa, A. Fujiwara, K. Takashina, and Y. Hirayama
      Phys. Rev. B 77, 073310 (2008).

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