Linear and nonlinear optical responses in the chiral multifold semimetal RhSi

Abstract Chiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analys...

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Autores principales:	Zhuoliang Ni, B. Xu, M.-Á. Sánchez-Martínez, Y. Zhang, K. Manna, C. Bernhard, J. W. F. Venderbos, F. de Juan, C. Felser, A. G. Grushin, Liang Wu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/943e5f7344d94c6da217b5467df52c39
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spelling	oai:doaj.org-article:943e5f7344d94c6da217b5467df52c392021-12-02T16:00:40ZLinear and nonlinear optical responses in the chiral multifold semimetal RhSi10.1038/s41535-020-00298-y2397-4648https://doaj.org/article/943e5f7344d94c6da217b5467df52c392020-12-01T00:00:00Zhttps://doi.org/10.1038/s41535-020-00298-yhttps://doaj.org/toc/2397-4648Abstract Chiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analysis of the linear and nonlinear optical responses of the chiral topological semimetal RhSi, which is known to host multifold fermions. We show that the characteristic features of the optical conductivity, which display two distinct quasi-linear regimes above and below 0.4 eV, can be linked to excitations of different kinds of multifold fermions. The characteristic features of the CPGE, which displays a sign change at 0.4 eV and a large non-quantized response peak of around 160 μA/V2 at 0.7 eV, are explained by assuming that the chemical potential crosses a flat hole band at the Brillouin zone center. Our theory predicts that, in order to observe a quantized CPGE in RhSi, it is necessary to increase the chemical potential as well as the quasiparticle lifetime. More broadly, our methodology, especially the development of the broadband terahertz emission spectroscopy, could be widely applied to study photogalvanic effects in noncentrosymmetric materials and in topological insulators in a contact-less way and accelerate the technological development of efficient infrared detectors based on topological semimetals.Zhuoliang NiB. XuM.-Á. Sánchez-MartínezY. ZhangK. MannaC. BernhardJ. W. F. VenderbosF. de JuanC. FelserA. G. GrushinLiang WuNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 5, Iss 1, Pp 1-10 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Zhuoliang Ni B. Xu M.-Á. Sánchez-Martínez Y. Zhang K. Manna C. Bernhard J. W. F. Venderbos F. de Juan C. Felser A. G. Grushin Liang Wu Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
description	Abstract Chiral topological semimetals are materials that break both inversion and mirror symmetries. They host interesting phenomena such as the quantized circular photogalvanic effect (CPGE) and the chiral magnetic effect. In this work, we report a comprehensive theoretical and experimental analysis of the linear and nonlinear optical responses of the chiral topological semimetal RhSi, which is known to host multifold fermions. We show that the characteristic features of the optical conductivity, which display two distinct quasi-linear regimes above and below 0.4 eV, can be linked to excitations of different kinds of multifold fermions. The characteristic features of the CPGE, which displays a sign change at 0.4 eV and a large non-quantized response peak of around 160 μA/V2 at 0.7 eV, are explained by assuming that the chemical potential crosses a flat hole band at the Brillouin zone center. Our theory predicts that, in order to observe a quantized CPGE in RhSi, it is necessary to increase the chemical potential as well as the quasiparticle lifetime. More broadly, our methodology, especially the development of the broadband terahertz emission spectroscopy, could be widely applied to study photogalvanic effects in noncentrosymmetric materials and in topological insulators in a contact-less way and accelerate the technological development of efficient infrared detectors based on topological semimetals.
format	article
author	Zhuoliang Ni B. Xu M.-Á. Sánchez-Martínez Y. Zhang K. Manna C. Bernhard J. W. F. Venderbos F. de Juan C. Felser A. G. Grushin Liang Wu
author_facet	Zhuoliang Ni B. Xu M.-Á. Sánchez-Martínez Y. Zhang K. Manna C. Bernhard J. W. F. Venderbos F. de Juan C. Felser A. G. Grushin Liang Wu
author_sort	Zhuoliang Ni
title	Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
title_short	Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
title_full	Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
title_fullStr	Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
title_full_unstemmed	Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
title_sort	linear and nonlinear optical responses in the chiral multifold semimetal rhsi
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/943e5f7344d94c6da217b5467df52c39
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Linear and nonlinear optical responses in the chiral multifold semimetal RhSi

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