Nature, Published online: 04 February 2026; doi:10.1038/s41586-025-10082-2

Terahertz microspectroscopic imaging at subgap millielectronvolt energies of a two-dimensional superfluid plasmon in few-layer Bi2Sr2CaCu2O8+x is demonstrated, allowing the spatial resolution of its deeply subdiffractive terahertz electrodynamics.


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