0488726 - ÚJF 2019 RIV GB eng J - Článek v odborném periodiku
Lavrentev, Vasyl - Chvostová, Dagmar - Stupakov, Alexandr - Lavrenteva, Inna - Vacík, Jiří - Motylenko, M. - Barchuk, M. - Rafaja, D. - Dejneka, Alexandr
Quantum plasmon and Rashba-like spin splitting in self-assembled CoxC60 composites with enhanced Co content (x > 15).
Nanotechnology. Roč. 29, č. 13 (2018), č. článku 135701. ISSN 0957-4484. E-ISSN 1361-6528
Grant CEP: GA ČR(CZ) GBP108/12/G108; GA MŠMT(CZ) LM2015088; GA MŠMT LM2015056
Institucionální podpora: RVO:61389005 ; RVO:68378271
Klíčová slova: fullerene * nanocomposites * quantum plasmon * optical spectra * energy band splitting
Obor OECD: Nano-materials (production and properties); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impakt faktor: 3.399, rok: 2018 ; AIS: 0.744, rok: 2018
DOI: https://doi.org/10.1088/1361-6528/aaaa7a

Driving by interplay between plasmonic and magnetic effects in organic composite semiconductors is a challenging task with a huge potential for practical applications. Here, we present evidence of a quantum plasmon excited in the self-assembled CoxC60 nanocomposite films with x > 15 (interval of the Co cluster coalescence) and analyse it using the optical absorption (OA) spectra. In the case of CoxC60 film with x = 16 (LF sample), the quantum plasmon generated by the Co/CoO clusters is found as the 1.5 eV-centred OA peak. This finding is supported by the establishment of four specific C-60-related OA lines detected at the photon energies E-p > 2.5 eV. Increase of the Co content up to x = 29 (HF sample) leads to pronounced enhancement of OA intensity in the energy range of E-p > 2.5 eV and to plasmonic peak downshift of 0.2 eV with respect to the peak position in the LF spectrum. Four pairs of the OA peaks evaluated in the HF spectrum at E-p > 2.5 eV reflect splitting of the C-60-related lines, suggesting great change in the microscopic conditions with increasing x. Analysis of the film nanostructure and the plasmon-induced conditions allows us to propose a Rashba-like spin splitting effect that suggests valuable sources for spin polarization.
Trvalý link: http://hdl.handle.net/11104/0283268