Temperature dependence of Fano resonances in CrPS4

Maurizio Riesner; Rachel Fainblat; Adam K Budniak; Yaron Amouyal; Efrat Lifshitz; Gerd Bacher

doi:10.1063/5.0079298

Temperature dependence of Fano resonances in CrPS₄

J Chem Phys. 2022 Feb 7;156(5):054707. doi: 10.1063/5.0079298.

Authors

Maurizio Riesner¹, Rachel Fainblat¹, Adam K Budniak², Yaron Amouyal³, Efrat Lifshitz², Gerd Bacher¹

Affiliations

¹ Werkstoffe der Elektrotechnik and CENIDE, University of Duisburg-Essen, Duisburg 47057, Germany.
² Schulich Faculty of Chemistry, Solid State Institute, Russell Berrie Nanotechnology Institute, Technion-Institute of Technology, Haifa 3200003, Israel.
³ Department of Materials Science and Engineering, Technion-Israel Institute of Technology, Haifa 3200003, Israel.

PMID: 35135270
DOI: 10.1063/5.0079298

Abstract

A Fano resonance, as often observed in scattering, absorption, or transmission experiments, arises from quantum interference between a discrete optical transition and a continuous background. Here, we present a temperature-dependent study on Fano resonances observed in photoluminescence from flakes of the layered semiconductor antiferromagnet chromium thiophosphate (CrPS₄). Two Fano resonances with a distinctly different temperature dependence were identified. The continuous background that is responsible for the Fano resonances is attributed to the d-d transition of the optically active Cr³⁺ center, predominantly the spin-forbidden ²E_g → ⁴A_2g transition with contributions of the broad-band ⁴T_2g → ⁴A_2g transition. The discrete states that interfere with this continuous background are suggested to arise from localized atomic phosphorus. A model idea for explaining the individual temperature dependence of the Fano resonances is presented.