On the Observability of Meso- and Macro-scopic Quantum Coherence of Domain Walls in Magnetic Insulators

TL;DR

This paper numerically investigates the quantum tunneling of domain walls in magnetic insulators and concludes that observing quantum coherence at mesoscopic or macroscopic scales is unlikely, even without dissipation.

Contribution

It provides a numerical analysis of tunneling gaps for domain walls in double well potentials, considering both symmetric and asymmetric cases, highlighting challenges in observing quantum coherence.

Findings

Quantum coherence in domain walls is hard to observe at meso- or macro-scales.

Tunneling gaps are calculated for different potential symmetries.

Quantum coherence prospects are limited even without dissipation.

Abstract

Results are presented of a numerical calculation of the tunneling gap for a domain wall moving in the double well potential of a pair of voids in a magnetic insulator. Both symmetric and asymmetric double well potentials are considered. It is found that, even in the absence of dissipation, the prospects for observing quantum coherence on a meso- or macro-scopic scale appears unlikely.