[1Ip01-08] Low-dimensional Material/Nanostructure/Nanomaterial (LD/NS/NM)

[1Ip05] Significant enhancement of current noise in carbon nanotube with finite length

*Aina Sumiyoshi¹, Keisuke Ishizeki², Kenji Sasaoka³, Takahiro Yamamoto^1,3 (1. Department of Physics, Tokyo University of Science, 2. Department of Electrical Engineering, Tokyo University of Science, 3. Research institute for Science and Technology, Tokyo University of Science)

Carbon nanotubes (CNTs) are potential candidates for use in nanoelectronics due to their excellent electrical and mechanical properties. In high-frequency device applications, it is essential to understand and control not only the averaged current characteristics, such as impedance, but also the current fluctuations, such as shot noise. In this study, we developed a new simulation method to calculate the time-dependent current flowing through nanoscale objects and applied it to inelastic electronic transport in CNTs at finite temperature. We find that the current fluctuation strongly depends on the tube length and exhibits the maximum when the tube length is comparable to the mean free path of the electron. This new finding can be understood in terms of quantum scattering theory combined with Büttiker's fictitious probe method.