What is it about?
Our work demonstrates selenium nanoflakes (SeNFs), fabricated via unique hot-pressing strategy, exhibit ultra-narrow linewidth photo-emitters especially at room-temperature. A process-induced crystal symmetry breaking in SeNFs results in localized polymorphic phase transition. This transition causes degenerate bright excitons in orthorhombic Se that serve as photoemitters with extremely narrow linewidth. Considering the increasing demand of lacking single photon sources in 2D materials, current report brings quasi-2D selenium into limelight.
Photo by Steve Johnson on Unsplash
Why is it important?
We show that Selenium NFs prepared via hot-pressing technique can be a promising candidate as a high-purity emitter and may find applications in solid state quantum photonics. This work also provides a fundamental insight on the correlation between the localized structural polymorphism and defect-related ultranarrow emissions.
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This page is a summary of: Ultra‐Narrow Linewidth Photo‐Emitters in Polymorphic Selenium Nanoflakes, Small, October 2022, Wiley,
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