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Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells

Author

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  • Xiaojie Liu

    (University of Utah)

  • Ashish Chanana

    (University of Utah
    University of Utah)

  • Uyen Huynh

    (University of Utah)

  • Fei Xue

    (National Institute of Standards and Technology
    University of Maryland)

  • Paul Haney

    (National Institute of Standards and Technology)

  • Steve Blair

    (University of Utah)

  • Xiaomei Jiang

    (University of South Florida)

  • Z. V. Vardeny

    (University of Utah)

Abstract

The two-dimensional (2D) Ruddlesden−Popper organic-inorganic halide perovskites such as (2D)-phenethylammonium lead iodide (2D-PEPI) have layered structure that resembles multiple quantum wells (MQW). The heavy atoms in 2D-PEPI contribute a large spin-orbit coupling that influences the electronic band structure. Upon breaking the inversion symmetry, a spin splitting (‘Rashba splitting’) occurs in the electronic bands. We have studied the spin splitting in 2D-PEPI single crystals using the circular photogalvanic effect (CPGE). We confirm the existence of Rashba splitting at the electronic band extrema of 35±10 meV, and identify the main inversion symmetry breaking direction perpendicular to the MQW planes. The CPGE action spectrum above the bandgap reveals spin-polarized photocurrent generated by ultrafast relaxation of excited photocarriers separated in momentum space. Whereas the helicity dependent photocurrent with below-gap excitation is due to spin-galvanic effect of the ionized spin-polarized excitons, where spin polarization occurs in the spin-split bands due to asymmetric spin-flip.

Suggested Citation

  • Xiaojie Liu & Ashish Chanana & Uyen Huynh & Fei Xue & Paul Haney & Steve Blair & Xiaomei Jiang & Z. V. Vardeny, 2020. "Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-14073-6
    DOI: 10.1038/s41467-019-14073-6
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    Cited by:

    1. M. Michiardi & F. Boschini & H.-H. Kung & M. X. Na & S. K. Y. Dufresne & A. Currie & G. Levy & S. Zhdanovich & A. K. Mills & D. J. Jones & J. L. Mi & B. B. Iversen & Ph. Hofmann & A. Damascelli, 2022. "Optical manipulation of Rashba-split 2-dimensional electron gas," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Xingyu Yue & Chunwei Wang & Bo Zhang & Zeyu Zhang & Zhuang Xiong & Xinzhi Zu & Zhengzheng Liu & Zhiping Hu & George Omololu Odunmbaku & Yujie Zheng & Kuan Sun & Juan Du, 2023. "Real-time observation of the buildup of polaron in α-FAPbI3," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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