Broadband frequency filters with quantum dot chains

TL;DR

This paper demonstrates that quantum dot chains can be engineered to produce rectangular transmission functions, enabling violations of standard thermodynamic uncertainty relations and enhancing heat engine performance beyond traditional limits.

Contribution

It introduces a method to realize rectangular transmission functions using quantum dot chains, surpassing linear response bounds and exploring thermodynamic limits.

Findings

Quantum dot chains can implement near-ideal rectangular transmission functions.

Violations of standard thermodynamic uncertainty relations are achievable.

Quantum dot-based heat engines show improved performance.

Abstract

Two-terminal electronic transport systems with a rectangular transmission can violate standard thermodynamic uncertainty relations. This is possible beyond the linear response regime and for parameters that are not accessible with rate equations obeying detailed-balance. Looser bounds originating from fluctuation theorem symmetries alone remain respected. We demonstrate that optimal finite-sized quantum dot chains can implement rectangular transmission functions with high accuracy and discuss the resulting violations of standard thermodynamic uncertainty relations as well as heat engine performance.