About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA)₂(MA)₂Pb₃l₁₀

Abstract

Time‐ and Angle‐Resolved Photoelectron Spectroscopy (tr‐ARPES) is employed to monitor photoexcited electrons in the 2D hybrid perovskite (BA)₂(MA)₂Pb₃l₁₀. Photoelectron intensity maps are in good agreement with ab‐initio calculations of the band structure. The effective mass is −0.18±0.02me and 0.12±0.02me for holes and electrons, respectively. In the photoexcited state, spin‐orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to eVÅ. The correlated electron‐hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self‐trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.

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BibTeX

@article{qi2026about,
  title = {{About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA)₂(MA)₂Pb₃l₁₀}},
  author = {Weiyan Qi and Stefano Ponzoni and Guénolé Huitric and Vitaly Gorelov and Ashim Pramanik and Yannis Laplace and Marino Marsi and Evangelos Papalazarou and Sebastian Maehrlein and Emmanuelle Deleporte and Nitin Mallik and Amina Taleb-Ibrahimi and Azzedine Bendounan and Kaibo Zheng and Tönu Pullerits and Luca Perfetti},
  journal = {Small},
  year = {2026},
  month = sep,
  doi = {10.1002/smll.202511410},
  url = {https://hal.science/hal-05734198v1},
  note = {CC BY 4.0},
}

RIS

TY  - JOUR
TI  - About Carrier's Self‐Trapping and Dynamical Rashba Splitting in the 2D Hybrid Perovskite (BA)₂(MA)₂Pb₃l₁₀
AU  - Weiyan Qi
AU  - Stefano Ponzoni
AU  - Guénolé Huitric
AU  - Vitaly Gorelov
AU  - Ashim Pramanik
AU  - Yannis Laplace
AU  - Marino Marsi
AU  - Evangelos Papalazarou
AU  - Sebastian Maehrlein
AU  - Emmanuelle Deleporte
AU  - Nitin Mallik
AU  - Amina Taleb-Ibrahimi
AU  - Azzedine Bendounan
AU  - Kaibo Zheng
AU  - Tönu Pullerits
AU  - Luca Perfetti
PY  - 2026
DA  - 2026/09/04
JO  - Small
DO  - 10.1002/smll.202511410
UR  - https://hal.science/hal-05734198v1
AB  - Time‐ and Angle‐Resolved Photoelectron Spectroscopy (tr‐ARPES) is employed to monitor photoexcited electrons in the 2D hybrid perovskite (BA)₂(MA)₂Pb₃l₁₀. Photoelectron intensity maps are in good agreement with ab‐initio calculations of the band structure. The effective mass is −0.18±0.02me and 0.12±0.02me for holes and electrons, respectively. In the photoexcited state, spin‐orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to eVÅ. The correlated electron‐hole plasma evolves in Wannier excitons with Bohr radius of 2.8 nm, while no sign of self‐trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.
SN  - 1613-6810
SN  - 1613-6829
ER  -

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