Artificial Arom in Carbon Nanotube Quantum Dots and its Quantum Teraherz Response

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  • ISHIBASHI Koji
    Advanced Device Laboratory, RIKEN CREST, Japan Science and Technology (JST)
  • MORIYAMA Satoshi
    Advanced Device Laboratory, RIKEN Present address: National Institute of Material Science (NIMS)
  • FUSE Tomoko
    Advanced Device Laboratory, RIKEN Present address: Kavli Institute of Nanoscience, Delft University of Technology
  • KAWANO Yukio
    Advanced Device Laboratory, RIKEN
  • TOYOKAWA Seiko
    Advanced Device Laboratory, RIKEN Department of Physics, Tokyo University of Science
  • YAMAGUCHI Tomohiro
    Advanced Device Laboratory, RIKEN

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  • カーボンナノチューブ人工原子とテラヘルツ量子応答
  • カーボン ナノチューブ ジンコウ ゲンシ ト テラヘルツ リョウシ オウトウ

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Abstract

  Quantum dots have been fabricated in an individual single-wall carbon nanotube (SWCNT), and single electron transport measurements have been carried out at low temperatures. It is demonstrated that the SWCNT quantum-dot can be considered as an artificial atom where electrons are confined in a one-dimensional hard-wall potential. A shell structure and shell filling in magnetic fields are shown, and the excitation energy spectrum in magnetic fields was obtained for one or two electrons in a shell. A striking observation may be that quantum states of an interacting two-electron system were observed as singlet and triplet states which have energy difference at zero magnetic field. Reflecting energy scales associated with the SWCNT artificial atom, a quantum response to THz wave was, for the first time, observed in quantum dots as a photon assisted tunneling.<br>

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