Presentation Information
[1P38]Length Dependence of Phonon-Induced Current Fluctuations in Gold Atomic Chains
*Atsuhiro Iida1, Aina Sumiyoshi, Raimu Akimoto1, Takahiro Yamamoto (1. Graduate School of Science, Tokyo University of Science)
Mesoscopic physics explores quantum phenomena through electron transport at the nanoscale. One key effect is current noise, which becomes prominent at this scale and reveals important physical insights. A study on carbon nanotubes (CNTs) showed that current noise peaks when the length L is near a characteristic length Lm, and decreases when L deviates from it. This is attributed to phonon scattering: at L≈Lm, scattered and transmitted electrons are balanced; for L≪Lm, electrons pass mostly unscattered; for L≫Lm , scattering averages out noise. To test if this behavior is universal, we study phonon-induced current noise in gold atomic chains. We use a tight-binding model with hopping terms modified via the SSH model to include phonons, and solve the open-system time-dependent Schrödinger equation. The simulation identifies Lm, and confirms increased fluctuations in the L≪Lm regime. In our presentation, we show current noise across the full range from ballistic to diffusive transport.