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The feasibility of using second-harmonic generation to measure the broken time-reversal symmetry and valley polarization in monolayer WSe2 is presented, simplifying the process of probing valleys on ultrafast timescales without perturbing the system.
A chip-integrated laser with 7.5 × 10−14 fractional frequency instability is demonstrated by active stabilization to an on-chip 6.1-m-long spiral resonator. By using this laser to interrogate the narrow-linewidth transition of 88Sr+, a clock instability averaging down as \(3.9\times 1{0}^{-14}/\sqrt{\tau }\) is achieved.
Dark-field momentum microscopy makes it possible to spatio-temporally and spatio-spectrally resolve the dark-exciton dynamics in a twisted transition metal dichalcogenide heterostructure.
Intrinsic optical bistability in Nd3+-doped KPb2Cl5 avalanching nanoparticles enables high-contrast switching between luminescent and non-luminescent states and transistor-like optical responses. A non-thermal mechanism is discussed and >200th-order optical nonlinearities are shown to be possible.
Hybrid hetero-integration of dual-functional perovskite diodes and a photonic neural network for computing tasks are demonstrated on a near-infrared monolithic on-chip photonic system based on a perovskite/silicon nitride platform, exemplifying the extension of perovskite device applications.
An on-chip, high-bandwidth-density non-Hermitian hybrid switching network based on the integration of III–V and silicon materials is demonstrated, paving the way for compact and ultrafast monolithic integrated silicon photonics for large-scale and high-dimensional information processing.
