Decoding ultrafast polarization responses in lead halide perovskites by the two-dimensional optical Kerr effect
Abstract
Optoelectronic devices, such as photovoltaics or light-emitting diodes, are based on the interaction of light with charges in the active material. Lead halide perovskites (LHPs) have emerged as excellent materials for optoelectronics, but mysteries remain as to how these materials interact with light. Here, we develop a spectroscopic method to observe the nearly instantaneous responses of LHPs to propagating light fields. This method has allowed us to precisely trace a nonlinear material response resulting from the mixing of different light components overtaking each other during propagation. The resulting oscillatory signals could be easily confused with collective motions of ions or molecules, but are quantitatively accounted by strong nonlinear mixing and polarization-dressed light propagation in single-crystal LHPs.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 08, 2021
- Source ID
- 10.1073/pnas.2022268118
Entities
People
- Daniele Meggiolaro
- Dominik M Juraschek
- Edoardo Mosconi
- Feifan Wang
- Filippo De Angelis
- Lucas Huber
- Marie Cherasse
- Prakriti P Joshi
- Sebastian F. Maehrlein
- Xiaoyang Zhu
- Yufeng Liu
Organizations
- Air Force Office of Scientific Research
- Columbia University
- ETH Zurich
- Harvard University
- Office of Naval Research Global
- United States Department of Energy
- University of Perugia