Investigating Josephson plasmons in layered cuprates via nonlinear terahertz spectroscopy

Abstract

Josephson plasmons in layered superconductors represent a natural source of optical non-linearity, thanks to their intrinsically anharmonic nature. Here we derive the selection rules behind non-linear plasmonics showing its dependence on plasmonic branches hidden to other spectroscopies, like 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 non-linear 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.

References in corpus (12)

• Terahertz-Field-Induced Ferroelectricity in Quantum Paraelectric SrTiO${}_3$
• Encapsulating high-temperature superconducting twisted van der Waals heterostructures blocks detrimental effects of disorder
• Twisted cuprate van der Waals heterostructures with controlled Josephson coupling
• Near-infrared light-induced superconducting-like state in underdoped YBa${}_2$Cu${}_3$O${}_y$ studied by $c$-axis terahertz third-harmonic generation
• Generalized plasma waves in layered superconductors
• Generalized Josephson plasmons in bilayer superconductors
• Plasmon dispersion in bilayer cuprate superconductors
• Terahertz third harmonic generation in c-axis La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$
• Revealing the frequency-dependent oscillations in the nonlinear terahertz response induced by the Josephson current
• Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators
• Terahertz phase slips in striped La${}_{2-x}$Ba${}_x$CuO${}_4$
• Charge density response in layered metals: retardation effects, generalized plasma waves and their spectroscopic signatures

Cited by in corpus (6)

• Principles of 2D terahertz spectroscopy of collective excitations: the case of Josephson plasmons in layered superconductors
• Multidimensional Terahertz Probes of Quantum Materials
• Ghost Josephson plasmon in bilayer superconductors
• Two-dimensional THz spectroscopy in electronic systems: a many-body diagrammatic approach
• Dynamical signatures and control of time-reversal breaking in twisted nodal superconductors
• Enhanced coherent terahertz emission from critical superconducting fluctuations in YBa${}_2$Cu${}_3$O${}_{6.6}$