Interference effect in the Landau-Zener tunneling of the antiferromagnetically coupled dimer of single-molecule magnets

TL;DR

This paper investigates how quantum interference affects Landau-Zener tunneling in a minimal model of two antiferromagnetically coupled single-molecule magnets, revealing oscillations in tunneling probability influenced by magnetic field gradients.

Contribution

It demonstrates the interference effect in Landau-Zener tunneling within a coupled dimer model, highlighting the role of quantum phase and magnetic field gradients.

Findings

Oscillations in staying probability vs resonance shift and sweep rate.

Magnetic field gradient can induce resonance shifts in Mn-4 dimers.

Quantum interference significantly impacts tunneling dynamics.

Abstract

Two antiferromagnetically coupled tunneling systems is a minimal model exhibiting the effect of quantum-mechanical phase in the Landau-Zener effect. It is shown that the averaged staying probability oscillates vs resonance shift between the two particles, as well as vs sweeping rate. Such a resonance shift can be produced in Mn-4 dimers by the gradient of the magnetic field.