We are part of an interdisciplinary multi-university collaboration which aims to establish room temperature polaritons in two-dimensional atomic crystals as a bridge from the discovery of new many-body phenomena to novel photonic technologies -- the polaritronics. [Link]
Large scale growth of monolayer transition metal dichalcogenides (TMDs) via chemical vapor deposition.
Single atomic layers of two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising candidates for the integration of optical and electronic circuits due to their extraordinary optical oscillator strength and large exciton binding energy. Customizing the exciton energy of the TMDs is a direct way to control the light-matter interaction. Here we demonstrate that the electronic bandgap of tungsten diselenide WSe2 can be tuned continuously with the application of the uniaxial tensile strain. [Read More]
We demonstrate that the exciton energy of a monolayer of tungsten diselenide (WSe2) on SiO2/Si substrate can be tuned by an applied in-plane electric eld for two samples with different dielectric capping materials. The exciton energy can be either red-shifted or blue-shifted up to 10 meV based on the polarity of the applied electric eld. We argue that there is a large internal electric field created through a piezoelectric effect which is either partially aligned or partially anti-aligned with our externally applied electric eld. Additionally, as we cycle the external electric eld, we see a hysteresis loop, leading us to conclude that there are trapped charges.