Fig. 4: Light emission with moiré superlattice-cavity devices.
From: Moiré-engineered light-matter interactions in MoS2/WSe2 heterobilayers at room temperature
a Sketch of the hBN-encapsulated MoS2/WSe2 heterobilayer (HB) on a SiO2-supported silicon topological nanobeam cavity. b Energy level diagram of the moiré superlattice with a small twist angle. Spontaneous emission (SE) from IXs can be enhanced by a cavity. c SEM image (the upper panel) of the cavity. The light red and blue areas illustrate two photonic crystals with different topological phases, leading to strong light confinement at their interface. The simulated mode profile is illustrated in the lower panel. Scale bar, 500 nm. d Output spectrum of device D1. The inset shows the optical microscope image of the device. Scale bar, 5 μm. e The thresholds of devices D1, D2, and D3. The dashed lines are a guide to the eye.
