Centrala begrepp
Andreev reflection enhances ∆T noise in NIS junctions compared to NIN junctions.
Sammanfattning
The study explores the characterization of ∆T noise auto-correlation in a 1D metal/insulator/superconductor junction, highlighting the impact of Andreev reflection. The investigation reveals that ∆T thermal-noise is always higher than ∆T shot-noise, establishing a general bound independent of barrier strength. In the transparent limit, where Andreev reflection is perfect, ∆T noise in NIS junctions is doubled compared to NIN junctions due to enhanced thermal-noise contributions. The study also discusses the behavior of quantum noise and its relation to temperature gradient and barrier strength.
Statistik
Charge ∆T noise arises due to a finite temperature gradient at vanishing current.
Quantum shot-noise dominates at large bias voltages, while quantum thermal-noise dominates at high-temperature bias.
In the transparent limit, total ∆T noise in NIS junctions is twice that of NIN junctions due to perfect Andreev reflection.
The ratio of shot-noise to thermal-noise contributions tends towards a finite value in the tunnel limit for both types of junctions.
Citat
"Andreev reflection enhances the ∆T noise in a metal-insulator-superconductor junction."
"∆T thermal-noise is always higher than ∆T shot-noise."
"In the tunnel limit, both ∆NIN Tsh and ∆NIN Tth vanish."