Strained bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">WSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> with reduced exciton-phonon coupling

Abstract

The authors investigate here the influence of strain on bilayer WSe${}_{2}$ using optical reflection and photoluminescence spectroscopy. The linewidth of the $A$ exciton exhibits a significant decrease, from 70 to 36 meV at room temperature under 2.1% strain. They note that this behavior is quite different in monolayer WSe${}_{2}$. They apply the model used earlier on monolayer WSe${}_{2}$ and show that the distinct behavior under strain stems from having different indirect-to-direct gap separations. Their findings are inspiring for utilizing strain for further studies on two-dimensional materials.

Topics & Concepts