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Title: THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5083849· OSTI ID:1610519

Strong coupling between light and matter occurs when the two interact such that new hybrid modes, the so-called polaritons, are formed. Here, we report on the strong coupling of both the electric and the magnetic degrees of freedom to an ultrafast terahertz (THz) frequency electromagnetic wave. In our system, optical phonons in a slab of ferroelectric lithium niobate are strongly coupled to a THz electric field to form phonon-polaritons, which are simultaneously strongly coupled to magnons in an adjacent slab of canted antiferromagnetic erbium orthoferrite via the magnetic-field component of the same THz pulse. We juxtapose experimental results of bare slabs consisting of the two materials with a photonic crystal cavity, consisting of a two-dimensional array of air holes cut into the hybrid slab. In both cases, the strong coupling leads to the formation of new magnon-phonon-polariton modes, which we experimentally observe in the time domain as a normal-mode beating and which corresponds in the frequency domain to an avoided crossing. Finally, our simple yet versatile waveguide platform provides a promising avenue through which to explore ultrafast THz spintronics, quantum electrodynamics, sensing, and spectroscopic applications.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
Grant/Contract Number:
SC0001088; CHE-1665383; 51372149; 51672171
OSTI ID:
1610519
Alternate ID(s):
OSTI ID: 1524127
Journal Information:
Journal of Applied Physics, Vol. 125, Issue 21; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (6)

Spin-wave coupling to electromagnetic cavity fields in dysposium ferrite journal January 2020
Advances in terahertz solid-state physics and devices journal September 2019
Strong coupling of collective intermolecular vibrations in organic materials at terahertz frequencies journal July 2019
Magnon polarons in the spin Peltier effect text January 2019
Cavity control of nonlinear phononics text January 2019
Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator preprint January 2021

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