Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

Abstract Nonlinear photocurrent in time-reversal invariant noncentrosymmetric systems such as ferroelectric semimetals sparked tremendous interest of utilizing nonlinear optics to characterize condensed matter with exotic phases. Here we provide a microscopic theory of two types of second-order nonl...

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Autores principales:	Hua Wang, Xiaofeng Qian
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
Acceso en línea:	https://doaj.org/article/42b9cadc11dc49ee87126402f38c83ed
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spelling	oai:doaj.org-article:42b9cadc11dc49ee87126402f38c83ed2021-12-02T13:56:11ZElectrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials10.1038/s41524-020-00462-92057-3960https://doaj.org/article/42b9cadc11dc49ee87126402f38c83ed2020-12-01T00:00:00Zhttps://doi.org/10.1038/s41524-020-00462-9https://doaj.org/toc/2057-3960Abstract Nonlinear photocurrent in time-reversal invariant noncentrosymmetric systems such as ferroelectric semimetals sparked tremendous interest of utilizing nonlinear optics to characterize condensed matter with exotic phases. Here we provide a microscopic theory of two types of second-order nonlinear direct photocurrents, magnetic shift photocurrent (MSC) and magnetic injection photocurrent (MIC), as the counterparts of normal shift current (NSC) and normal injection current (NIC) in time-reversal symmetry and inversion symmetry broken systems. We show that MSC is mainly governed by shift vector and interband Berry curvature, and MIC is dominated by absorption strength and asymmetry of the group velocity difference at time-reversed ±k points. Taking $${\cal{P}}{\cal{T}}$$ P T -symmetric magnetic topological quantum material bilayer antiferromagnetic (AFM) MnBi2Te4 as an example, we predict the presence of large MIC in the terahertz (THz) frequency regime which can be switched between two AFM states with time-reversed spin orderings upon magnetic transition. In addition, external electric field breaks $${\cal{P}}{\cal{T}}$$ P T symmetry and enables large NSC response in bilayer AFM MnBi2Te4, which can be switched by external electric field. Remarkably, both MIC and NSC are highly tunable under varying electric field due to the field-induced large Rashba and Zeeman splitting, resulting in large nonlinear photocurrent response down to a few THz regime, suggesting bilayer AFM-z MnBi2Te4 as a tunable platform with rich THz and magneto-optoelectronic applications. Our results reveal that nonlinear photocurrent responses governed by NSC, NIC, MSC, and MIC provide a powerful tool for deciphering magnetic structures and interactions which could be particularly fruitful for probing and understanding magnetic topological quantum materials.Hua WangXiaofeng QianNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Computer softwareQA76.75-76.765ENnpj Computational Materials, Vol 6, Iss 1, Pp 1-8 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Computer software QA76.75-76.765 Hua Wang Xiaofeng Qian Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
description	Abstract Nonlinear photocurrent in time-reversal invariant noncentrosymmetric systems such as ferroelectric semimetals sparked tremendous interest of utilizing nonlinear optics to characterize condensed matter with exotic phases. Here we provide a microscopic theory of two types of second-order nonlinear direct photocurrents, magnetic shift photocurrent (MSC) and magnetic injection photocurrent (MIC), as the counterparts of normal shift current (NSC) and normal injection current (NIC) in time-reversal symmetry and inversion symmetry broken systems. We show that MSC is mainly governed by shift vector and interband Berry curvature, and MIC is dominated by absorption strength and asymmetry of the group velocity difference at time-reversed ±k points. Taking $${\cal{P}}{\cal{T}}$$ P T -symmetric magnetic topological quantum material bilayer antiferromagnetic (AFM) MnBi2Te4 as an example, we predict the presence of large MIC in the terahertz (THz) frequency regime which can be switched between two AFM states with time-reversed spin orderings upon magnetic transition. In addition, external electric field breaks $${\cal{P}}{\cal{T}}$$ P T symmetry and enables large NSC response in bilayer AFM MnBi2Te4, which can be switched by external electric field. Remarkably, both MIC and NSC are highly tunable under varying electric field due to the field-induced large Rashba and Zeeman splitting, resulting in large nonlinear photocurrent response down to a few THz regime, suggesting bilayer AFM-z MnBi2Te4 as a tunable platform with rich THz and magneto-optoelectronic applications. Our results reveal that nonlinear photocurrent responses governed by NSC, NIC, MSC, and MIC provide a powerful tool for deciphering magnetic structures and interactions which could be particularly fruitful for probing and understanding magnetic topological quantum materials.
format	article
author	Hua Wang Xiaofeng Qian
author_facet	Hua Wang Xiaofeng Qian
author_sort	Hua Wang
title	Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
title_short	Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
title_full	Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
title_fullStr	Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
title_full_unstemmed	Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials
title_sort	electrically and magnetically switchable nonlinear photocurrent in рт-symmetric magnetic topological quantum materials
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/42b9cadc11dc49ee87126402f38c83ed
work_keys_str_mv	AT huawang electricallyandmagneticallyswitchablenonlinearphotocurrentinrtsymmetricmagnetictopologicalquantummaterials AT xiaofengqian electricallyandmagneticallyswitchablenonlinearphotocurrentinrtsymmetricmagnetictopologicalquantummaterials
_version_	1718392374108880896

Electrically and magnetically switchable nonlinear photocurrent in РТ-symmetric magnetic topological quantum materials

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