Andreev reflection mediated Δ_T noise
arxiv(2024)
摘要
Quantum noise has been extensively utilized to investigate various aspects of
quantum transport, such as current-current correlations and wave-particle
duality. A recent focus in this field is on Δ_T quantum noise, which
arises because of a finite temperature difference at vanishing charge current.
This paper explores the characterization of Δ_T noise auto-correlation
alongside the shot noise and thermal-noise contributions in a 1D
metal/insulator/superconductor junction. We consider a finite temperature
gradient with zero applied bias for reservoirs at comparable temperatures.
Andreev reflection enhances the Δ_T noise in a
metal-insulator-superconductor junction in contrast to a
metal-insulator-superconductor junction in the transparent limit. Unlike
quantum noise for which shot-noise dominates thermal-noise at large bias
voltages and finite barrier strength, Δ_T thermal-noise is always higher
than Δ_T shot-noise. Thus, a general bound that is independent of
barrier strength is established. This investigation sheds light on the distinct
behavior of Δ_T noise, alongside the ratio of shot-noise to
thermal-noise contributions, offering valuable insights into the intricate
interplay between finite temperature gradient, barrier strength, and Andreev
reflection.
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