Investigating Josephson plasmons in layered cuprates via nonlinear terahertz spectroscopy

Jacopo Fiore; Niccolò Sellati; Francesco Gabriele; Claudio Castellani; Goetz Seibold; Mattia Udina; Lara Benfatto

doi:10.1103/PhysRevB.110.L060504

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Investigating Josephson plasmons in layered cuprates via nonlinear terahertz spectroscopy

Jacopo Fiore, Niccolò Sellati, Francesco Gabriele, Claudio Castellani, Goetz Seibold, Mattia Udina, Lara Benfatto

DOI 10.1103/PhysRevB.110.L060504 · Physical Review B

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Abstract

Josephson plasmons in layered superconductors represent a natural source of optical nonlinearity, thanks to their intrinsically anharmonic nature. Here we derive the selection rules behind nonlinear plasmonics showing its dependence on plasmonic branches hidden to other spectroscopies, such as RIXS. We benchmark our results for the case of layered cuprates, showing how in a layered system the combined effect of plasmon dispersion and light polarization can move the resonance of the bilayer system away from the plasma edge measured in linear spectroscopy. Our results demonstrate the dependence of the nonlinear THz response on the convoluted plasmon dispersion in a momentum region complementary to RIXS, and offer a possible perspective for the generation of THz pulses by artificially designed Josephson heterostructures.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	61	Pressure not reported	unknown