Long-range spin transport in asymmetric quadruple quantum dots configurations

TL;DR

This paper theoretically explores how asymmetry in quadruple quantum dot arrays can enable long-range coherent charge transport by identifying resonant conditions that minimize intermediate occupation.

Contribution

It introduces a master equation approach to determine precise resonant conditions for long-range transfer in asymmetric QQD configurations, emphasizing the role of parameter asymmetry and coherence.

Findings

Resonant conditions enable minimal intermediate occupation.

Asymmetry enhances long-range charge transfer.

Coherent tunneling is crucial for efficient transfer.

Abstract

We theoretically investigate long-range coherent charge transport in linear quadruple quantum dot (QQD) arrays under reduced symmetry configurations. Employing a master equation approach, we identify precise resonant conditions that enable minimal occupation of intermediate dots, thereby facilitating long-range transfer between distant sites. Our results highlight the critical role of parameter asymmetry and coherent tunneling mechanisms in achieving efficient quantum state transfer.