Detection of spin polarization with a side coupled quantum dot

TL;DR

This paper introduces methods for detecting local spin polarization using a side-coupled quantum dot, enabling spin detection with minimal disturbance and demonstrating experimental feasibility in magnetic fields.

Contribution

The paper proposes realistic, minimally invasive spin detection schemes utilizing a side-coupled quantum dot and demonstrates an experimental realization of one such scheme.

Findings

Proposed methods enable spin detection with low disturbance.

Experimental demonstration of spin detection scheme in magnetic fields.

Potential for practical applications in spintronics.

Abstract

We propose realistic methods to detect local spin polarization, which utilize a quantum dot side coupled to the target system. By choosing appropriate states in the dot, we can put spin selectivity to the dot and detect spins in the target with small disturbance. We also present an experiment which realizes one of the proposed spin detection schemes in magnetic fields.