Low frequency 1/f - conductance noise spectroscopyย
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A low-frequency 1/f conductance noise spectroscopy technique has been developed to investigate the dynamics and relaxation of charge carriers and collective modes (CDW) in quasi-1D vdW materials. The lock-in based phase-sensitive detection allows us to measure the sample noise contribution as well as background noise simultaneously. We are focusing on a few interesting problems employing the noise spectroscopy setup: (i) the dynamics of charge carriers in functionalized conductive polymers, (ii) dynamics of electric field-induced phase transitions in MoTe2 and WTe2 (iii) sliding CDW and SDW modes in quasi-1D systems and (iv) carrierโs dynamics in inorganic perovskite materials for photovoltaic applications. For details, see Ref. Kalimuddin et al, PRL (2024)ย
(a) Representative time series of resistance fluctuations in (TaSe4)2I around ๐_CDW with a vertical shift of 0.15% for clarity. (b) Normalized PSD [ S๐ โก(f)/๐ 2] of corresponding resistance fluctuations. (c) Temperature dependence of PSD exponent ๐ผ, where S_๐ โก(f)/๐ ^2 โ 1/๐๐ผ. (d) Temperature variation of the relaxation time ( ๐)ย which is estimated from the autocorrelation of resistance fluctuations. (e) The relative variance of resistance fluctuations for two samples. The solid lines (red) in (d)โ(e) show the diverging trend at ๐ =๐_CDW.ย For details, see Ref. Kalimuddin et al, PRL (2024)
Schematic diagram of the experimental setup for low-frequency 1/f noise measurement based on phase sensitive detection of signals using lock-in amplifiers.ย
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