Ultrafast Faraday rotation probe of chiral phonon-polaritons in LiNbO3
MF Biggs, A Alejandro, M Lutz, CD Moss… - arXiv preprint arXiv …, 2025 - arxiv.org
MF Biggs, A Alejandro, M Lutz, CD Moss, JA Johnson
arXiv preprint arXiv:2507.22232, 2025•arxiv.orgTime reversal symmetry breaking motion of chiral phonon-polaritons in LiNbO3 is probed via
the ultrafast Faraday effect. By combining a pair of perpendicularly polarized THz pulses
with the right relative delay, we create a chiral THz driving field to excite chiral phonon-
polaritons. The chiral atomic motion combines with the inverse Faraday effect from the
circularly polarized THz pump to induce a magnetic moment field in the nonmagnetic
material, LiNbO3. We attempt to quantify the strength of the magnetic field with Faraday …
the ultrafast Faraday effect. By combining a pair of perpendicularly polarized THz pulses
with the right relative delay, we create a chiral THz driving field to excite chiral phonon-
polaritons. The chiral atomic motion combines with the inverse Faraday effect from the
circularly polarized THz pump to induce a magnetic moment field in the nonmagnetic
material, LiNbO3. We attempt to quantify the strength of the magnetic field with Faraday …
Time reversal symmetry breaking motion of chiral phonon-polaritons in LiNbO3 is probed via the ultrafast Faraday effect. By combining a pair of perpendicularly polarized THz pulses with the right relative delay, we create a chiral THz driving field to excite chiral phonon-polaritons. The chiral atomic motion combines with the inverse Faraday effect from the circularly polarized THz pump to induce a magnetic moment field in the nonmagnetic material, LiNbO3. We attempt to quantify the strength of the magnetic field with Faraday rotation probe measurements. The direction of the Faraday signal flips when the input THz pulse is changed from left- to right-circular polarization, and we estimate a strong induced magnetic field strength of ~11 Tesla based on the Faraday rotation.
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