2024/03/16 by Mishra, Sachiraj, Dora, A Rajmohan, Mohapatra, Tusaradri +1
Computer Science · Engineering · Mathematics · #Applied Physics (physics.app-ph) #Blind Source Separation Techniques #FOS: Electrical engineering #FOS: Physical sciences #Geophysics and Sensor Technology #Mathematical Analysis and Transform Methods #Mathematical Physics (math-ph) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum Physics (quant-ph) #Systems and Control (eess.SY) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2403.10990
openalex publication_date 2024/03/16 · openalex created_date 2024/03/21 · openalex updated_date 2026/07/28
Quantum noise is a fundamental probe of quantum transport phenomena, offering insights into current correlations and wave-particle duality. A particularly intriguing form of such noise, ΔT noise, emerges under a finite temperature difference in the absence of charge current at zero voltage bias. In this work, we investigate ΔT noise in mesoscopic hybrid junctions incorporating insulating barriers, where the average charge current remains zero at zero bias. Using quantum shot noise measurements, we demonstrate that ΔT noise in metal-insulator-superconductor (NIS) junctions is approximately 16 times greater than in metal-insulator-metal (NIN) counterparts. Our analysis further reveals that ΔT noise exhibits a non-monotonic dependence on barrier strength, rising to a peak before declining, while increasing monotonically with the applied temperature bias. These findings underscore the rich interplay between thermal gradients and barrier properties in determining quantum noise characteristics in hybrid mesoscopic systems.