Magnetically brightened dark electron-phonon bound states in a van der Waals antiferromagnet.

ABSTRACT: In van der Waals (vdW) materials, strong coupling between different degrees of freedom can hybridize elementary excitations into bound states with mixed character^1-3. Correctly identifying the nature and composition of these bound states is key to understanding their ground state properties and excitation spectra^4,5. Here, we use ultrafast spectroscopy to reveal bound states of d-orbitals and phonons in 2D vdW antiferromagnet NiPS₃. These bound states manifest themselves through equally spaced phonon replicas in frequency domain. These states are optically dark above the Néel temperature and become accessible with magnetic order. By launching this phonon and spectrally tracking its amplitude, we establish the electronic origin of bound states as localized d

SUBMITTER: Ergecen E 

PROVIDER: S-EPMC8748959 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature