Anomalous Coulomb oscillation in crossed carbon nanotubes

ORAL

Abstract

Single-walled carbon nanotube (SWCNT) crossed junctions separated by an insulating layer were fabricated to investigate the double quantum dot modulated by a single gate (DQD-sG). Anomalous Coulomb oscillations were observed on the lower CNT at low temperature, where the behavior was interpreted by the concept of a double quantum dot (DQD) system http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id =APPLAB000089000023233107000001\&idtype=cvips\&gifs=yes [1]. To understand it more clearly, we have intentionally fabricated crossed CNTs without oxide layer in between. The observed anomalous Coulomb oscillations indicate that the contact resistance between the two tubes becomes a potential barrier splitting the initial single QD into the DQD, and the back-gate modulates the energy levels of the DQD.

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Authors

  • Seung Jae Baek

    Nano Systems Institute-National Core Research Center, Seoul National University

  • Dongsu Lee

    Department of Physics and Astronomy, Seoul National University

  • Seung Joo Park

    Nano Systems Institute-National Core Research Center, Seoul National University

  • Yung Woo Park

    Department of Physics and Astronomy, Seoul National University

  • Johannes Svensson

    Department of Physics, Gothenburg University, SE-41296 Gothenburg, Sweden

  • Mats Jonson

    Department of Physics, Gothenburg University, SE-41296, Sweden

  • Eleanor E. B. Campbell

    Department of Physics, Gothenburg University, SE-41296 Gothenburg, Sweden