Low-Frequency Noise in Quasi-1D (TaSe₄)₂I Weyl Semimetal Nanoribbons

2022/08/12 by Subhajit Ghosh, Ghosh, Subhajit, Kargar, Fariborz +11
Physics and Astronomy · Materials Science · #Topological Materials and Phenomena #Graphene research and applications #Quantum and electron transport phenomena

paper · pdf · doi:10.48550/arxiv.2208.06476

Abstract

We report on low-frequency current fluctuations, i.e. electronic noise, in quasi-one-dimensional (TaSe₄)₂I 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~I² (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 (TaSe₄)₂I crystals. The noise level, normalized by the channel area, in these Weyl semimetal nanoribbons was surprisingly low, ∼ 10^-9 um²Hz^-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.

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