Low-Frequency Noise in Quasi-1D (TaSe$_4$)$_2$I Weyl Semimetal Nanoribbons

TL;DR

This study investigates low-frequency electronic noise in quasi-1D (TaSe$_4$)$_2$I Weyl semimetal nanoribbons, revealing 1/f noise behavior, temperature-dependent spectral features, and surprisingly low noise levels relevant for nanoelectronic applications.

Contribution

It provides the first detailed analysis of low-frequency noise in (TaSe$_4$)$_2$I Weyl semimetal nanoribbons, highlighting unique spectral features and implications for electron transport in topological materials.

Findings

Noise spectral density follows 1/f behavior and scales with I^2.

Spectral features change near 225 K, indicating charge-density-wave transition.

Normalized noise level is very low, around 10^{-9} μm^2Hz^{-1} at 10 Hz.

Abstract

We report on low-frequency current fluctuations, i.e. electronic noise, in quasi-one-dimensional (TaSe$_4$)$_2$I Weyl semimetal nanoribbons. It was found that the noise spectral density is of the 1/f type and scales with the square of the current, S~I^2 (f is the frequency). The noise spectral density increases by almost an order of magnitude and develops Lorentzian features near the temperature T~225 K. These spectral changes were attributed to the charge-density-wave phase transition even though the temperature of the noise maximum deviates from the reported Peierls transition temperature in bulk (TaSe$_4$)$_2$I crystals. The noise level, normalized by the channel area, in these Weyl semimetal nanoribbons was surprisingly low, $\sim 10^{-9}$ um$^2$Hz$^{-1}$ at f=10 Hz, when measured below and above the Peierls transition temperature. Obtained results shed light on the specifics of electron transport in quasi-1D topological Weyl semimetals and can be important for their proposed applications as downscaled interconnects.