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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
Students of color said they feel most of their calls to eliminate racist symbols from campuses have been ignored or intentionally mired in lengthy, bureaucratic processes intended to delay answers to difficult questions.
Amy is now living overseas, and her sister s best friend contacted the founders and helped them to reconnect.
The founders said they spoke to Amy on the phone, and she sent them photos of herself from when she was living in Austin so that the founders could confirm that it was really her.
Tiff s Treats said they wanted to give Amy free cookies for a year, but because she is living overseas, she chose to donate the cookies to a nonprofit.
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As some of you and many others are, I am trying to understand SARS-CoV-2.
I apologize for mistakenly using the term âtransmissivityâ in my last letter on SARS-CoV-2 in The Independent. âTransmissivityâ is more appropriate with electromagnetic radiation and has little to do with viruses. I should have written âtransmissionâ or âtransmissibilityâ instead: a stupid error by me.
Given this contrition, since that letter, I have learned something else from reading about what some virologists are saying - the term âvariantâ is a misnomer, and it is therefore meaningless in regard to viruses. âVariantâ to what? A norm? There is no ânormâ with viruses. I will now replace âvariantâ with the monikers âmutant(s)â or âmutant lineage(s).â