Control of Spin Blockade by AC Magnetic Fields in Triple Quantum Dots

TL;DR

This paper investigates how AC magnetic fields can control spin blockade phenomena in triple quantum dots, enabling manipulation of spin states and current flow for quantum computing applications.

Contribution

It introduces a method to manipulate spin blockade in triple quantum dots using AC magnetic fields, revealing antiresonant current behaviors and spin state control.

Findings

AC magnetic fields induce antiresonant current behavior.

Tuning AC field frequency can restore or remove spin blockade.

Theoretical framework for manipulating spin qubits in quantum dot arrays.

Abstract

We analyze coherent spin phenomena in triple quantum dots in triangular configuration under crossed DC and AC magnetic fields. In particular, we discuss the interplay between Aharonov-Bohm current oscillations, coherent electron trapping and spin blockade under electron spin resonance conditions. We demonstrate that, for certain field frequencies, AC magnetic fields induce an antiresonant behavior in the current, allowing for both removal and restoration of entangled spin blockaded states by tuning the AC field frequency. Our theoretical predictions indicate how to manipulate spin qubits in a triangular quantum dot array.