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.

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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.

Perspectives

It was a great pleasure working and collaborating with all co-authors on this project. This article provides a new dimension in solid-state photonics research.

Naveed Hussain
University of California Irvine

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This page is a summary of: Ultra‐Narrow Linewidth Photo‐Emitters in Polymorphic Selenium Nanoflakes, Small, October 2022, Wiley, DOI: 10.1002/smll.202204302.
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