Goki Eda

Abstract Two-dimensional optical modulators often suffer from low efficiency due to defect-induced losses and light–matter interaction strength. Here we show that edge defects in solution-processed WSe2 nanosheets, arising from metallic 1 T domains at the edges and semiconducting 2H interiors, can be dynamically saturated through carrier trap filling.

Abstract Long-lived dark excitons in monolayer WSe2 present promising candidates for carrying spin and valley information, but their optical access and spin manipulation have conventionally required the use of strong external magnetic fields. Here, using a ferroelectric hybrid perovskite heterostructure, we leverage the ferroelectric proximity effect to break the WSe2’s in-plane rotational symmetry and brighten the spin-forbidden dark excitons under zero magnetic field conditions.

Abstract The rapid expansion of self-powered electronics in the Internet of Things, 6G communication and millimetre-wave systems calls for rectifiers capable of operating across ultrabroadband frequencies and at extremely low input power levels. However, conventional rectifiers based on semiconductor junctions face fundamental limitations such as parasitic capacitance and threshold voltages, preventing effective operation under broadband and ambient radio-frequency conditions.