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A New Twist on Exciton Lifetimes
January 26, 2021•
Physics 14, s2
Varying the twist angle between layers of a 2D semiconductor can prolong the duration of resonances that give the material its unique optoelectronic properties.
J. Choi
J. Choi
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Structures made by stacking two semiconductor monolayers have unique optical and electronic properties, making them promising platforms for nanoelectronic and photonic devices. Central to these properties are excitons electron-hole pairs that exist briefly between when a semiconductor absorbs a photon and when it re-emits it. As excitons in 2D semiconductors are notoriously short-lived, prolonging them is critical to optimizing the performance of optoelectronic devices based on these layered materials. Junho Choi of the University of Texas Austin and Matthias Florian of the University of Bremen, Germany, and colleagues now show that such an extension of exciton lifetimes can be achieved by varying the angle between the semic