Low-Frequency Electronic Noise of the Charge Density Waves in the Niobium Triselenide Nanowires

Low-frequency electronic noise in charge-density-wave (CDW) van der Waals materials can provide information about the material quality, phase transitions, and collective current transport. In this presentation, we describe the noise study results in nanowires of quasi-1D niobium triselenide, over a wide temperature range. The data analysis allowed us to separate the noise produced by the individual conduction electrons and the condensate of CDWs before and after the onset of sliding. The noise as a function of temperature and electric bias reveals several interesting peaks. We explained the observed features by the depinning threshold field, and the creep and sliding of CDWs. The CDW condensate was found to be particularly noisy at the depinning point. The noise of the collective current reduces with the increasing bias voltage compared to the noise of the individual electrons. We also discuss the experiments with gating such nanowires and the effect of the electric gate on the noise level. Our results shed light on the behavior of the charge density wave condensate and demonstrate the potential of noise spectroscopy for investigating the properties of quasi-1D quantum materials.