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Interaction between Cooper pairs and other collective excitations may reveal important information about the pairing mechanism. Here, the authors observe a universal jump in the phase of the driven Higgs oscillations in cuprate thin films, indicating the presence of a coupled collective mode, as well as a nonvanishing Higgs-like response at high temperatures, suggesting a potential nonzero pairing amplitude above Tc.

Unidirectional spin-hall magnetoresistance is a change in the conductivity of ferromagnetic/heavy metal bilayers that is sensitive to the magnetisation of the ferromagnetic layer. This sensitivity makes it a potential candidate for magnetic state readout. Here, Salikhov et al demonstrate ultrafast unidirectional spin hall magnetoresistance driven by terahertz fields

Magnons offer a variety of attractive features for information processing: low dissipation, controllable non-linearity, short wavelengths at typical frequencies used in information technologies. Here, Metzger et al demonstrate control of a strongly coupled two-magnon-one-phonon state in antiferromagnetic CoF2.

Polycrystalline thin films of elemental bismuth exhibit a room-temperature nonlinear transverse voltage due to geometric effects of surface electrons that is tunable and can be extended to efficient high-harmonic generation at terahertz frequencies.

Terahertz frequencies offer the potential of much higher data transfer rates, but this requires devices able to generate and manipulate terahertz waves. One approach is to utilize the spin dynamics of a magnetic system. Here, Ilyakov et al. show how a multilayer magnetic and heavy-metal heterostructure can be used to achieve terahertz second harmonic generation and optical rectification.

Cuprate superconductors are known for their intertwined interactions and coexistence of competing orders. Here, the authors observe a Fano resonance in the nonlinear THz response of La_2-xSr_xCuO₄, which may arise from a coupling between superconducting and charge-density-wave amplitude fluctuations.

Engineering of the spin–orbit interactions in a magnetic multilayered structure makes it possible to coherently generate coherent spin waves using terahertz radiation, which could benefit the development of spintronic devices.

The mechanism and scaling of high harmonic generation in solids is a highly compelling ongoing area of research. Here the authors show a non-perturbative behavior of HHG in terahertz regime from 3D Dirac semimetal, Cd₃As₂, at room temperature, and reveal the underlying nonlinear kinetics.

Inertial dynamics are observed in a ferromagnet. Specifically, a nutation is seen on top of the usual spin precession that has a lifetime on the order of 10 picoseconds.

Technologies operating in the terahertz (THz) range are essential for advancing high-speed communication, sensing and imaging. Here, the authors demonstrate that a HgTe-based heterostructure with electronic band inversion can efficiently mix and up-convert weak signals into THz frequencies at room temperature, using strong nonlinear effects.

Efficient terahertz harmonic generation—challenging but important for ultrahigh-speed optoelectronic technologies—is demonstrated in graphene through a nonlinear process that could potentially be generalized to other materials.

Topological insulator metamaterials bring nonlinear terahertz photonic technology a step closer by producing a third-harmonic output power close to a milliwatt.