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Transient circular dichroism and exciton spin dynamics in all-inorganic halide perovskites

Author

Listed:
  • Weijie Zhao

    (Nanyang Technological University)

  • Rui Su

    (Nanyang Technological University)

  • Yuqing Huang

    (Nanyang Technological University)

  • Jinqi Wu

    (Nanyang Technological University)

  • Chee Fai Fong

    (Nanyang Technological University)

  • Jiangang Feng

    (Nanyang Technological University)

  • Qihua Xiong

    (Nanyang Technological University
    Tsinghua University)

Abstract

All-inorganic metal halides perovskites (CsPbX3, X = Br or Cl) show strong excitonic and spin-orbital coupling effects, underpinning spin-selective excitonic transitions and therefore exhibiting great promise for spintronics and quantum-optics applications. Here we report spin-dependent optical nonlinearities in CsPbX3 single crystals by using ultrafast pump-probe spectroscopy. Many-body interactions between spin-polarized excitons act like a pseudo-magnetic field and thus lift the degeneracy of spin states resulting in a photoinduced circular dichroism. Such spontaneous spin splitting between “spin-up” and “spin-down” excitons can be several tens of milli-electron volts under intense excitations. The exciton spin relaxation time is ~20 picoseconds at very low pump fluence, the longest reported in the metal halides perovskites family at room temperature. The dominant spin-flip mechanism is attributed to the electron-hole exchange interactions. Our results provide essential understandings towards realizing practical spintronics applications of perovskite semiconductors.

Suggested Citation

  • Weijie Zhao & Rui Su & Yuqing Huang & Jinqi Wu & Chee Fai Fong & Jiangang Feng & Qihua Xiong, 2020. "Transient circular dichroism and exciton spin dynamics in all-inorganic halide perovskites," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19471-9
    DOI: 10.1038/s41467-020-19471-9
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    Cited by:

    1. Junqing Xu & Kejun Li & Uyen N. Huynh & Mayada Fadel & Jinsong Huang & Ravishankar Sundararaman & Valy Vardeny & Yuan Ping, 2024. "How spin relaxes and dephases in bulk halide perovskites," Nature Communications, Nature, vol. 15(1), pages 1-13, December.

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