Magnetic quantum coherence effect in Ni4 molecular transistors

TL;DR

This paper investigates how magnetic quantum coherence influences electron transport in Ni4 molecular transistors, revealing resonance phenomena caused by quantum coherence effects under magnetic fields.

Contribution

It introduces the concept of MQC resonances in single molecule magnet transistors and analyzes their impact on conductance under magnetic and bias conditions.

Findings

MQC induces resonances in conductance.

Zeeman splitting creates spin-polarized transport channels.

MQC resonances depend on magnetic field and bias.

Abstract

We consider the electron transport in single molecule magnet transistors in the presence of Zeeman spin splitting and magnetic quantum coherence (MQC). The Zeeman interaction is extended along the leads, thereby producing gaps in the energy spectrum which allow electron transport with spin polarized along a certain direction. The MQC induces an effective coupling between localized spin states and continuum spin states in the single molecule magnet and leads, respectively. We investigate the conductance at zero temperature as a function of the applied bias and magnetic field, and show that the MQC is responsible for the appearence of resonances. Accordingly, we name them MQC resonances.