Precision control of charge coherence in parallel double dot systems through spin-orbit interaction

TL;DR

This paper investigates how spin-orbit interaction can be used to precisely control charge coherence in parallel double quantum dot systems, demonstrating the possibility of maintaining decoherence-free states and manipulating coherence dynamically.

Contribution

The study provides an exact quantum master equation analysis showing that spin-orbit coupling enables precise coherence control and decoherence-free states in double quantum dots.

Findings

Double dot system can remain in a decoherence-free space

Spin-orbit interaction allows precise coherence manipulation

Temperature and bandwidth effects on coherence are characterized

Abstract

In terms of the exact quantum master equation solution for open electronic systems, the coherent dynamics of two charge states described by two parallel quantum dots with one fully polarized electron on either dot is investigated in the presence of spin-orbit interaction. We demonstrate that the double dot system can stay in a dynamically decoherence free space. The coherence between two double dot charge states can be precisely manipulated through a spin-orbit coupling. The effects of the temperature, the finite bandwidth of lead, and the energy deviations during the coherence manipulation are also explored.