Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/168564
Title: Generation of multiple plasmons in strontium niobates mediated by local field effects
Authors: Zhu, Tao 
Trevisanutto, Paolo E. 
Asmara, Teguh Citra 
Xu, Lei
Feng, Yuan Ping 
Rusydi, Andrivo 
Issue Date: 7-Dec-2018
Publisher: American Physical Society
Citation: Zhu, Tao, Trevisanutto, Paolo E., Asmara, Teguh Citra, Xu, Lei, Feng, Yuan Ping, Rusydi, Andrivo (2018-12-07). Generation of multiple plasmons in strontium niobates mediated by local field effects. PHYSICAL REVIEW B 98 (23). ScholarBank@NUS Repository.
Abstract: Recently, an anomalous generation of multiple plasmons with large spectral weight transfer in the visible to ultraviolet range (energies below the band gap) has been experimentally observed in the insulatinglike phase of oxygen-rich strontium niobium oxides (SrNbO3+?). Here, we investigate the ground-state and dielectric properties of SrNbO3+? as a function of ? by means of extensive first-principle calculations. We find that in the random phase approximation by taking into account local field effects, our calculations are able to reproduce both the unconventional multiple generations of plasmons and the spectral weight transfers, consistent with experimental data. Interestingly, these unconventional plasmons can be tuned by oxygen stoichiometry as well as microscopic superstructure. This unusual predominance of local field effects in this class of materials is ascribed to the strong electronic inhomogeneity and high polarizability and paves a new path to induce multiple plasmons in the untapped visible to ultraviolet ranges of insulatinglike oxides. © 2018 American Physical Society.
Source Title: PHYSICAL REVIEW B
URI: https://scholarbank.nus.edu.sg/handle/10635/168564
ISSN: 24699950
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