Nonequilibrium noise as a probe of pair-tunneling transport in the BCS--BEC Crossover

TL;DR

This paper proposes using nonequilibrium noise measurements, specifically the Fano factor, to identify the dominant tunneling carriers in strongly interacting fermionic systems across the BCS-BEC crossover, revealing a transition from quasiparticle to pair tunneling.

Contribution

It introduces a method to detect the tunneling carrier type in strongly correlated fermions via noise analysis, highlighting the Fano factor's role as a probe across the BCS-BEC crossover.

Findings

Fano factor increases from 1 to 2 with stronger interactions.

Transition from quasiparticle to pair tunneling as interaction strength grows.

Noise measurement can distinguish different tunneling mechanisms.

Abstract

The detection of elementary carriers in transport phenomena is one of the most important keys to understand non-trivial properties of strongly-correlated quantum matter. Here we propose a method to identify the tunneling current carrier in strongly interacting fermions from nonequilibrium noise in the Bardeen-Cooper-Schrieffer to Bose--Einstein condensate crossover. The noise-to-current ratio, the Fano factor, can be a crucial probe for the current carrier. Bringing strongly-correlated fermions into contact with a dilute reservoir produces a tunneling current in between. The associated Fano factor increases from one to two as the interaction becomes stronger, reflecting the fact that the dominant conduction channel changes from the quasiparticle tunneling to the pair tunneling.