Single Electron Transport in electrically tunable nanomagnets

TL;DR

This paper investigates a single electron transistor with a quantum dot doped with a Mn ion, demonstrating electrically tunable magnetic and electrical properties due to spin-dependent interactions.

Contribution

It introduces a novel electrically tunable quantum nanomagnet system based on a Mn-doped quantum dot, revealing spin-dependent transport phenomena.

Findings

Magnetic properties depend on carrier number and orbital nature.

Electrical control over nanomagnet's spin state is demonstrated.

Hysteresis observed in Coulomb blockade oscillations.

Abstract

We study a single electron transistor (SET) based upon a II-VI semiconductor quantum dot doped with a single Mn ion. We present evidence that this system behaves like a quantum nanomagnet whose total spin and magnetic anisotropy depend dramatically both on the number of carriers and their orbital nature. Thereby, the magnetic properties of the nanomagnet can be controlled electrically. Conversely, the electrical properties of this SET depend on the quantum state of the Mn spin, giving rise to spin-dependent charging energies and hysteresis in the Coulomb blockade oscillations of the linear conductance.