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

Ergeçen, Emre; Ilyas, Batyr; Mao, Dan; Po, Hoi Chun; Yilmaz, Mehmet Burak; Kim, Junghyun; Park, Je-Geun; Senthil, T.; Gedik, Nuh

doi:10.1038/s41467-021-27741-3

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

Journal Article · 10 January 2022 · Nature Communications

DOI: https://doi.org/10.1038/s41467-021-27741-3 · OSTI ID:2470376

Ergeçen, Emre ^[1];

^[1]; Mao, Dan ^[1]; Po, Hoi Chun ^[2]; Yilmaz, Mehmet Burak ^[1]; Kim, Junghyun ^[3];

^[3]; Senthil, T. ^[1];

^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Hong Kong University of Science and Technology (HKUST) (Hong Kong)
Seoul National Univ. (Korea, Republic of)

In van der Waals (vdW) materials, strong coupling between different degrees of freedom can hybridize elementary excitations into bound states with mixed character. Correctly identifying the nature and composition of these bound states is key to understanding their ground state properties and excitation spectra. 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–d excitations. Our data directly yield electron-phonon coupling strength which exceeds the highest known value in 2D systems. These results demonstrate NiPS₃ as a platform to study strong interactions between spins, orbitals and lattice, and open pathways to coherent control of 2D magnets.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation; National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI ID:: 2470376

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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