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Title: Second-harmonic generation in noncentrosymmetric phosphates
Authors: Li, Zhi
Liu, Qiong
Wang, Ying
Iitaka, Toshiaki
Su, Haibin
Tohyama, Takami
Yang, Zhihua
Pan, Shilie
Keywords: DRNTU::Engineering::Materials
Optical Conductivity
Issue Date: 2017
Source: Li, Z., Liu, Q., Wang, Y., Iitaka, T., Su, H., Tohyama, T., . . . Pan, S. (2017). Second-harmonic generation in noncentrosymmetric phosphates. Physical Review B, 96(3), 035205-. doi:10.1103/PhysRevB.96.035205
Series/Report no.: Physical Review B
Abstract: Motivated by the discovery of more and more phosphates with relatively strong nonlinear optic effect, we studied the mechanism of the second-harmonic generation (SHG) effect in several phosphates by band model and first-principles calculations. When the energy of an incident photon is much smaller than the band gap of material, the SHG is almost frequency independent and determined by the combination of Berry connection and a symmetric tensor. The SHG effect in phosphates can be enhanced by the enhancement of orbital hybridization or the reduction of charge-transfer energy, which results in widened bandwidth of occupied state and reduced band gap in the electronic structure, respectively. By the first-principles calculation on the electronic structures of several phosphates—BPO4, LiCs2PO4, β-Li3VO4, and β-Li3PO4—we interpreted the relatively strong SHG effect in LiCs2PO4 and β-Li3VO4 as the consequence of the reduced charge-transfer energy compared to their parent β-Li3PO4, while the enhanced SHG in BPO4 is resulting from enhanced orbital hybridization
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.96.035205
Rights: © 2017 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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