Decoupling and antiresonance in a quantum dot chain with two neighboring dots coupled to both leads

TL;DR

This paper theoretically investigates electron transport in a quantum dot chain with two neighboring dots connected to both leads, revealing eigenstate decoupling and antiresonance phenomena influenced by magnetic flux adjustments.

Contribution

It introduces a novel analysis of eigenstate decoupling and antiresonance effects in a quantum dot chain with magnetic flux control, expanding understanding of quantum transport phenomena.

Findings

Odd eigenstates decouple from leads without magnetic flux.

Even eigenstates decouple when magnetic flux is applied.

Adjusting magnetic flux induces new antiresonances.

Abstract

Electron transport through a quantum dot chain with two neighboring dots coupled to both leads is theoretically studied. In such a system, it is found that only for the even-numbered quantum dot structure with the same-number quantum dots coupled to each connecting dot, some eigenstates of the quantum dots decouple from the leads. Namely, all odd eigenstates decouple from the leads in the absence of magnetic flux, but all even eigenstates will decouple from the leads when a magnetic flux is introduced. In addition, by adjusting the magnetic fluxes through any subring, some eigenstates decouple from one lead but still couple to the other, and then some new antiresonances occur.