Andreev reflection mediated $\Delta_T$ noise
<|reference_start|>Andreev reflection mediated $\Delta_T$ noise: 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 $\Delta_T$ quantum noise, which arises because of a finite temperature difference at vanishing charge current. This paper explores the characterization of $\Delta_T$ 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 $\Delta_T$ noise in a metal-insulator-superconductor junction in contrast to a metal-insulator-metal junction in the transparent limit. Unlike quantum noise for which shot-noise dominates thermal-noise at large bias voltages and finite barrier strength, $\Delta_T$ thermal-noise is always higher than $\Delta_T$ shot-noise. Thus, a general bound that is independent of barrier strength is established. This investigation sheds light on the distinct behavior of $\Delta_T$ 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.<|reference_end|>
@article{mohapatra2024andreev,
    title={Andreev reflection mediated $\Delta_T$ noise},
    author={Tusaradri Mohapatra, Colin Benjamin},
    journal={arXiv preprint arXiv:2403.10990},
    year={2024},
    archivePrefix={arXiv},
    eprint={2403.10990},
    primaryClass={cond-mat.mes-hall cs.SY eess.SY math-ph math.MP physics.app-ph quant-ph}
}