0619390 - ÚFCH JH 2026 RIV GB eng J - Článek v odborném periodiku
Sahu, Satyam - Berrezueta-Palacios, C. - Juergensen, S. - Mosina, K. - Sofer, Z. - Velický, Matěj - Kusch, P. - Frank, Otakar
Resonance Raman scattering and anomalous anti-Stokes phenomena in CrSBr.
Nanoscale. (2025). ISSN 2040-3364. E-ISSN 2040-3372
Grant CEP: GA ČR GF23-06174K; GA MŠMT EH22_008/0004558
Grant ostatní: AV ČR(CZ) LQ200402201
Program: Prémie Lumina quaeruntur
Institucionální podpora: RVO:61388955
Klíčová slova: temperature-dependent raman * waals * spectra
Obor OECD: Physical chemistry
Impakt faktor: 5.8, rok: 2023 ; AIS: 1.14, rok: 2023
Způsob publikování: Open access
DOI: https://doi.org/10.1039/d5nr00562k

CrSBr, a van der Waals material, stands out as an air-stable magnetic semiconductor with appealing intrinsic properties such as crystalline anisotropy, quasi-1D electronic characteristics, layer-dependent antiferromagnetism, and non-linear optical effects. We investigate the differences between the absorption and emission spectra, focusing on the origin of the emission peak near 1.7 eV observed in the photoluminescence spectrum of CrSBr. Our findings are corroborated by excitation energy-dependent Raman experiments. Additionally, we explore the anti-Stokes Raman spectra and observe an anomalously high anti-Stokes-to-Stokes intensity ratio of up to 0.8, which varies significantly with excitation laser power and crystallographic orientation relative to the polarization of the scattered light, highlighting the unique vibrational and electronic interactions in CrSBr. Lastly, we examine stimulated Raman scattering and calculate the Raman gain in CrSBr, which attains a value of 1 x 108 cm GW-1, nearly four orders of magnitude higher than that of previously studied three-dimensional systems.
Trvalý link: https://hdl.handle.net/11104/0366124