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  Second-harmonic generation in the topological multifold semimetal RhSi

Lu, B., Sayyad, S., Sánchez-Martínez, M. Á., Manna, K., Felser, C., Grushin, A. G., et al. (2022). Second-harmonic generation in the topological multifold semimetal RhSi. Physical Review Research, 4(2): L022022, pp. 1-7. doi:10.1103/PhysRevResearch.4.L022022.

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 Creators:
Lu, Baozhu1, Author
Sayyad, Sharareh1, Author
Sánchez-Martínez, Miguel Ángel1, Author
Manna, Kaustuv2, Author              
Felser, Claudia3, Author              
Grushin, Adolfo G.1, Author
Torchinsky, Darius H.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Band structure, Calculations, Dispersions, Light sources, Nonlinear optics, Silicon, Tantalum compounds, Topology, Breakings, First principle calculations, Frequency windows, Harmonics generation, Incoming light, Linear dispersion, Nonlinear optical response, Second harmonics, Simple++, Topological bands, Harmonic generation
 Abstract: Recent experiments in the topological Weyl semimetal TaAs have observed record-breaking second-harmonic generation (SHG), a nonlinear optical response at 2? generated by an incoming light source at ?. However, whether SHG is enhanced in topological semimetals in general is a challenging open question because their band structure entangles the contributions arising from trivial bands and topological band crossings. In this work, we circumvent this problem by studying RhSi, a chiral topological semimetal with a simple band structure with topological multifold fermions close to the Fermi energy. We measure SHG in a wide frequency window, ? [0.27,1.5]eV and, using first-principles calculations, we establish that, due to their linear dispersion, the contribution of multifold fermions to SHG is subdominant as compared with other regions in the Brillouin zone. Our calculations suggest that parts of the bands where the dispersion is relatively flat contribute significantly to SHG. As a whole, our results suggest avenues to enhance SHG responses. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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Language(s): eng - English
 Dates: 2022-04-262022-04-26
 Publication Status: Published in print
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 Identifiers: DOI: 10.1103/PhysRevResearch.4.L022022
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Title: Physical Review Research
Source Genre: Journal
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Publ. Info: College Park, Maryland, United States : American Physical Society (APS)
Pages: - Volume / Issue: 4 (2) Sequence Number: L022022 Start / End Page: 1 - 7 Identifier: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564