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Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators

Author

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  • Meng Wu

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory)

  • Zhenglu Li

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory)

  • Ting Cao

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory)

  • Steven G. Louie

    (University of California at Berkeley
    Lawrence Berkeley National Laboratory)

Abstract

The recent discovery of magnetism in atomically thin layers of van der Waals crystals has created great opportunities for exploring light–matter interactions and magneto-optical phenomena in the two-dimensional limit. Optical and magneto-optical experiments have provided insights into these topics, revealing strong magnetic circular dichroism and giant Kerr signals in atomically thin ferromagnetic insulators. However, the nature of the giant magneto-optical responses and their microscopic mechanism remain unclear. Here, by performing first-principles GW and Bethe-Salpeter equation calculations, we show that excitonic effects dominate the optical and magneto-optical responses in the prototypical two-dimensional ferromagnetic insulator, CrI3. We simulate the Kerr and Faraday effects in realistic experimental setups, and based on which we predict the sensitive frequency- and substrate-dependence of magneto-optical responses. These findings provide physical understanding of the phenomena as well as potential design principles for engineering magneto-optical and optoelectronic devices using two-dimensional magnets.

Suggested Citation

  • Meng Wu & Zhenglu Li & Ting Cao & Steven G. Louie, 2019. "Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10325-7
    DOI: 10.1038/s41467-019-10325-7
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    Cited by:

    1. P. Padmanabhan & F. L. Buessen & R. Tutchton & K. W. C. Kwock & S. Gilinsky & M. C. Lee & M. A. McGuire & S. R. Singamaneni & D. A. Yarotski & A. Paramekanti & J.-X. Zhu & R. P. Prasankumar, 2022. "Coherent helicity-dependent spin-phonon oscillations in the ferromagnetic van der Waals crystal CrI3," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Benjamin Carey & Nils Kolja Wessling & Paul Steeger & Robert Schmidt & Steffen Michaelis de Vasconcellos & Rudolf Bratschitsch & Ashish Arora, 2024. "Giant Faraday rotation in atomically thin semiconductors," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Freddie Hendriks & Rafael R. Rojas-Lopez & Bert Koopmans & Marcos H. D. Guimarães, 2024. "Electric control of optically-induced magnetization dynamics in a van der Waals ferromagnetic semiconductor," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    4. Swagata Acharya & Dimitar Pashov & Cedric Weber & Mark Schilfgaarde & Alexander I. Lichtenstein & Mikhail I. Katsnelson, 2023. "A theory for colors of strongly correlated electronic systems," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    5. Guanghui Cheng & Mohammad Mushfiqur Rahman & Zhiping He & Andres Llacsahuanga Allcca & Avinash Rustagi & Kirstine Aggerbeck Stampe & Yanglin Zhu & Shaohua Yan & Shangjie Tian & Zhiqiang Mao & Hechang , 2022. "Emergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    6. ZhuangEn Fu & Piumi I. Samarawickrama & John Ackerman & Yanglin Zhu & Zhiqiang Mao & Kenji Watanabe & Takashi Taniguchi & Wenyong Wang & Yuri Dahnovsky & Mingzhong Wu & TeYu Chien & Jinke Tang & Allan, 2024. "Tunneling current-controlled spin states in few-layer van der Waals magnets," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    7. Xing Cheng & Zhixuan Cheng & Cong Wang & Minglai Li & Pingfan Gu & Shiqi Yang & Yanping Li & Kenji Watanabe & Takashi Taniguchi & Wei Ji & Lun Dai, 2021. "Light helicity detector based on 2D magnetic semiconductor CrI3," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    8. Jinwoong Hwang & Kyoo Kim & Canxun Zhang & Tiancong Zhu & Charlotte Herbig & Sooran Kim & Bongjae Kim & Yong Zhong & Mohamed Salah & Mohamed M. El-Desoky & Choongyu Hwang & Zhi-Xun Shen & Michael F. C, 2022. "Large-gap insulating dimer ground state in monolayer IrTe2," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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