Breakthroughs in Two-Dimensional Material Research: Fabricating Devices with QPress

The research team leveraged the behavior of excitons in a device made of three atomically thin layers of WSe2, demonstrating a giant nonlinear optical response with unprecedented efficiency. The team found that the optical nonlinearity is only observed when the material is electrostatically doped with free charges by applying a voltage bias. Moreover, the response can be readily tuned by changing the voltage. The device was fabricated using the Quantum Material Press (QPress) at the Center for Functional Nanomaterials, a Department of energy Office of science user facility at Brookhaven National Laboratory.