Macrospin Tunneling and Magnetopolaritons with Nanomechanical Interference

Abstract

We theoretically address the quantum dynamics of a nanomechanical resonator coupled to the macrospin of a magnetic nanoparticle by both instanton and perturbative approaches. We demonstrate suppression of the tunneling between opposite magnetizations by nanomechanical interference. By approximating the macrospin as a two-level system, we describe magnetopolaritons and their destruction by interference. The predictions can be verified experimentally by a molecular magnet attached to a nanomechanical bridge.

4.4 pages, 3 figures. Slightly revised presentation, results unchanged

References in corpus (2)

• Dissipation in circuit quantum electrodynamics: lasing and cooling of a low-frequency oscillator
• Probing the quantum coherence of a nanomechanical resonator using a superconducting qubit: I. Echo scheme