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Optical Activity of Chiral Excitons.

Publication ,  Journal Article
Sercel, PC; Hautzinger, MP; Song, R; Blum, V; Beard, MC
Published in: Advanced materials (Deerfield Beach, Fla.)
January 2025

Recent activity in the area of chiroptical phenomena has been focused on the connection between structural asymmetry, electron spin configuration and light/matter interactions in chiral semiconductors. In these systems, spin-splitting phenomena emerge due to inversion symmetry breaking and the presence of extended electronic states, yet the connection to chiroptical phenomena is lacking. Here, we develop an analytical effective mass model of chiral excitons, parameterized by density functional theory. The model accounts for parity mixing of the band edge Bloch functions resulting from polar distortions, resulting in allowed magnetic dipole transitions. Through the study of a prototypical chiral 2D hybrid perovskite semiconductor, we show that circular dichroism of the chiral exciton and its interband continuum emerges from spin-splitting via cross-coupling of Rashba-like and chiral/helical spin-texture components. To demonstrate the generality of our approach, and as a counterpoint, we apply our model to describe chiroptical properties of three-dimensionally confined excitons in perovskite nanocrystals that occur without chiral lattice distortions.

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Published In

Advanced materials (Deerfield Beach, Fla.)

DOI

EISSN

1521-4095

ISSN

0935-9648

Publication Date

January 2025

Start / End Page

e2415901

Related Subject Headings

  • Nanoscience & Nanotechnology
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences
 

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Sercel, P. C., Hautzinger, M. P., Song, R., Blum, V., & Beard, M. C. (2025). Optical Activity of Chiral Excitons. Advanced Materials (Deerfield Beach, Fla.), e2415901. https://doi.org/10.1002/adma.202415901
Sercel, Peter C., Matthew P. Hautzinger, Ruyi Song, Volker Blum, and Matthew C. Beard. “Optical Activity of Chiral Excitons.Advanced Materials (Deerfield Beach, Fla.), January 2025, e2415901. https://doi.org/10.1002/adma.202415901.
Sercel PC, Hautzinger MP, Song R, Blum V, Beard MC. Optical Activity of Chiral Excitons. Advanced materials (Deerfield Beach, Fla). 2025 Jan;e2415901.
Sercel, Peter C., et al. “Optical Activity of Chiral Excitons.Advanced Materials (Deerfield Beach, Fla.), Jan. 2025, p. e2415901. Epmc, doi:10.1002/adma.202415901.
Sercel PC, Hautzinger MP, Song R, Blum V, Beard MC. Optical Activity of Chiral Excitons. Advanced materials (Deerfield Beach, Fla). 2025 Jan;e2415901.
Journal cover image

Published In

Advanced materials (Deerfield Beach, Fla.)

DOI

EISSN

1521-4095

ISSN

0935-9648

Publication Date

January 2025

Start / End Page

e2415901

Related Subject Headings

  • Nanoscience & Nanotechnology
  • 51 Physical sciences
  • 40 Engineering
  • 34 Chemical sciences
  • 09 Engineering
  • 03 Chemical Sciences
  • 02 Physical Sciences