Phonon dichroism in proximitized graphene

We systematically investigate the phonon dichroism in proximitized graphene with broken time-reversal symmetry. We find that in the absence of any type of spin-orbit coupling, phonon dichroism vanishes. Linear and circular phonon dichroism occur in the presence of uniform (staggered) intrinsic spin-orbit coupling and ferromagnetic (antiferromagnetic) exchange coupling. All these situations can be distinguished by their specific behaviors of phonon absorption at the transition point. Our finding provides new possibilities to use phonon dichroism to identify the form of spin-orbit coupling and exchange coupling in proximitized graphene on various magnetic substrates.

Automated summary

This paper systematically investigates the phonon dichroism in proximitized graphene and finds that it vanishes in the absence of spin-orbit coupling. Linear and circular phonon dichroism occur in the presence of specific spin-orbit coupling and exchange coupling, which can be distinguished by the behavior of phonon absorption.