Cavity magnon-polaritons in cuprate parent compounds
- URL: http://arxiv.org/abs/2106.07828v1
- Date: Tue, 15 Jun 2021 01:19:57 GMT
- Title: Cavity magnon-polaritons in cuprate parent compounds
- Authors: Jonathan B. Curtis, Andrey Grankin, Nicholas R. Poniatowski, Victor M.
Galitski, Prineha Narang, Eugene Demler
- Abstract summary: cavity control of quantum matter may offer new ways to study and manipulate many-body systems.
We propose a scheme for coupling Terahertz resonators to the antiferromagnetic fluctuations in a cuprate parent compound.
We find a strong, but heavily damped, bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Cavity control of quantum matter may offer new ways to study and manipulate
many-body systems. A particularly appealing idea is to use cavities to enhance
superconductivity, especially in unconventional or high-$T_c$ systems.
Motivated by this, we propose a scheme for coupling Terahertz resonators to the
antiferromagnetic fluctuations in a cuprate parent compound, which are believed
to provide the glue for Cooper pairs in the superconducting phase. First, we
derive the interaction between magnon excitations of the Ne\'el-order and polar
phonons associated with the planar oxygens. This mode also couples to the
cavity electric field, and in the presence of spin-orbit interactions mediates
a linear coupling between the cavity and magnons, forming hybridized
magnon-polaritons. This hybridization vanishes linearly with photon momentum,
implying the need for near-field optical methods, which we analyze within a
simple model. We then derive a higher-order coupling between the cavity and
magnons which is only present in bilayer systems, but does not rely on
spin-orbit coupling. This interaction is found to be large, but only couples to
the bimagnon operator. As a result we find a strong, but heavily damped,
bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes
in the strong-coupling regime. To conclude, we outline several interesting
extensions of our theory, including applications to carrier-doped cuprates and
other strongly-correlated systems with Terahertz-scale magnetic excitations.
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