Multiferroic Quantum Criticality

TL;DR

This paper introduces the concept of multiferroic quantum criticality, where magnetic and ferroelectric quantum critical points coexist, exploring its phenomenology, experimental signatures, and potential material realizations.

Contribution

It is the first to define and analyze multiferroic quantum criticality, combining magnetic and ferroelectric quantum critical phenomena in a unified framework.

Findings

Developed phenomenology of multiferroic quantum criticality

Identified experimental signatures of this phenomenon

Proposed candidate materials and schemes for realization

Abstract

The zero-temperature limit of a continuous phase transition is marked by a quantum critical point, which can generate exotic physics that extends to elevated temperatures. Magnetic quantum criticality is now well known, and has been explored in systems ranging from heavy fermion metals to quantum Ising materials. Ferroelectric quantum critical behaviour has also been recently established, motivating a flurry of research investigating its consequences. Here, we introduce the concept of multiferroic quantum criticality, in which both magnetic and ferroelectric quantum criticality occur in the same system. We develop the phenomenology of multiferroic quantum critical behaviour, describe the associated experimental signatures, and propose material systems and schemes to realize it.