Enhanced Efficiency at Maximum Power in a Fock-Darwin Model Quantum Dot Engine

TL;DR

This paper investigates how tuning the confinement in a Fock-Darwin quantum dot affects the performance of a magnetic Otto cycle, revealing conditions where efficiency surpasses classical limits at maximum power.

Contribution

It introduces a detailed analysis of a quantum dot-based Otto cycle, showing how geometrical confinement tuning can enhance efficiency beyond classical bounds.

Findings

Efficiency at maximum power can exceed Curzon-Ahlborn efficiency.

Tuning trap intensity influences power, work, and efficiency.

Existence of parameter regions where the quantum cycle outperforms classical limits.

Abstract

We study the performance of an endoreversible magnetic Otto cycle with a working substance composed of a single quantum dot described using the well-known Fock-Darwin model. We find that tuning the intensity of the parabolic trap (geometrical confinement) impacts the proposed cycle's performance, quantified by the power, work, efficiency, and parameter region where the cycle operates as an engine. We demonstrate that a parameter region exists where the efficiency at maximum output power exceeds the Curzon-Ahlborn efficiency, the efficiency at maximum power achieved by a classical working substance.