Terahertz Metamaterial Renormalization of Superconducting Josephson Plasmons in La_1.85Sr_0.15CuO_4
arxiv(2024)
摘要
We investigate light-matter coupling in the cuprate superconductor
La_1.85Sr_0.15Cu0_4 (LSCO), accomplished by adhering metamaterial
resonator arrays (MRAs) to a c-axis oriented single crystal. The resonators
couple to the Josephson Plasma Mode (JPM) which manifests as a plasma edge in
the terahertz reflectivity in the superconducting state. Terahertz reflectivity
measurements at 10K reveal a renormalization of the JPM frequency,
ω_jpm, from 1.7 THz for the bare crystal to ∼1 THz with the MRAs.
With increasing temperature, the modified ω_jpm redshifts as expected
for decreasing superfluid density, vanishing above T_c. The modification of
the electrodynamic response arises from resonator induced screening of the
longitudinal polariton response, reminiscent of plasmon-phonon coupling in
doped semiconductors. Modeling reveals that the electrodynamic response is
fully interpretable using classical electromagnetism. Future studies will have
to contend with the large effects we observe which could obscure subtle changes
that may indicate cavity-based manipulation of superconductivity. Finally, we
note that our MRA/LSCO structure is a tunable epsilon-near-zero (ENZ)
metamaterial that exhibits a nonlinear response arising from the c-axis
Josephson tunneling coupled with the local fields of the resonators.
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