Second harmonic generation on incommensurate structures: The case of multiferroic MnWO4

Abstract

A comprehensive analysis of optical second harmonic generation (SHG) on an incommensurate (IC) magnetically ordered state is presented using multiferroic MnWO4 as model compound. Two fundamentally different SHG contributions coupling to the primary IC magnetic order or to secondary commensurate projections of the IC state, respectively, are distinguished. Whereas the latter can be described within the formalism of the 122 commensurate magnetic point groups the former involves a breakdown of the conventional macroscopic symmetry analysis because of its sensitivity to the lower symmetry of the local environment in a crystal lattice. Our analysis thus foreshadows the fusion of the hitherto disjunct fields of nonlinear optics and IC order in condensed-matter systems.

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Cited by in corpus (6)

• Possible persistence of multiferroic order down to bilayer limit of van der Waals material NiI${}_2$
• Time-resolved imaging of magnetoelectric domain switching in multiferroic MnWO4
• Lattice and spin dynamics in a low-symmetry antiferromagnet NiWO${}_4$
• Infrared-active phonon modes in monoclinic multiferroic MnWO4
• Electric quadrupole second harmonic generation revealing dual magnetic orders in a magnetic Weyl semimetal
• Photo-creating supercooled spiral-spin states in a multiferroic manganite