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Raman Optical Activity of 1T-TaS2.
Lacinska, Ewa M; Furman, Magdalena; Binder, Johannes; Lutsyk, Iaroslav; Kowalczyk, Pawel J; Stepniewski, Roman; Wysmolek, Andrzej.
Affiliation
  • Lacinska EM; Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
  • Furman M; Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
  • Binder J; Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
  • Lutsyk I; Faculty of Physics and Applied Informatics, University of Lodz, Pomorska 149/153, 90-236 Lodz, Poland.
  • Kowalczyk PJ; Faculty of Physics and Applied Informatics, University of Lodz, Pomorska 149/153, 90-236 Lodz, Poland.
  • Stepniewski R; Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
  • Wysmolek A; Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland.
Nano Lett ; 22(7): 2835-2842, 2022 04 13.
Article in En | MEDLINE | ID: mdl-35369696
ABSTRACT
Measurements of optical activity can be readily performed in transparent matter by means of a rotation of transmitted light polarization. In the case of opaque bulk materials, such measurements cannot be performed, making it difficult to assess possible chiral properties. In this work, we present full angular polarization dependencies of the Raman modes of bulk 1T-TaS2, which has recently been suggested to have chiral properties after pulsed laser excitation. We found that a mechanical rotation of the sample does not alter polarization-resolved Raman spectra, which can only be explained by introducing an antisymmetric Raman tensor, frequently used to describe Raman optical activity (ROA). Raman spectra obtained under circularly polarized excitation demonstrate that 1T-TaS2 indeed shows ROA, providing strong evidence that 1T-TaS2 is chiral under the used conditions of laser excitation. Our results suggest that ROA may be used as a universal tool to study chiral properties of quantum materials.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Spectrum Analysis, Raman Language: En Journal: Nano Lett Year: 2022 Document type: Article Affiliation country: Polonia

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Spectrum Analysis, Raman Language: En Journal: Nano Lett Year: 2022 Document type: Article Affiliation country: Polonia