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Order-Disorder Transition Induced Dynamic Rashba Effect in 2D Halide Perovskites
Yang Li1, Quanlin Chen2, Yawei Lv1
1School of Physics and Electronics, and College of Semiconductors (College of Integrated Circuits), Hunan University, Changsha, Hunan 410082, P. R. China.
Nano Letters
|March 26, 2025
Summary
Phenyl-based cations in 2D perovskites induce a dynamic Rashba effect, crucial for spintronics. This dynamic Rashba effect impacts exciton dynamics and enhances circularly polarized light emission, vital for optoelectronic devices.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) hybrid organic-inorganic perovskites show significant Rashba splitting, making them attractive for spintronic applications.
- The precise mechanism of inversion symmetry breaking and its influence on excitonic optical properties in these materials are not fully understood.
Purpose of the Study:
- To investigate the role of order-disorder transitions in 2D Ruddlesden-Popper perovskites.
- To elucidate the mechanism behind the dynamic Rashba effect and its impact on excitonic optical properties.
- To explore the potential for enhancing spintronic and optoelectronic applications.
Main Methods:
- Experimental investigation of 2D Ruddlesden-Popper perovskites with phenyl-based cations.
- Analysis of exciton recombination lifetime and circularly polarized photoluminescence.
- Fabrication of van der Waals heterostructures and theoretical calculations (density functional theory).
Main Results:
- An order-disorder transition induced by phenyl-based cations triggers a dynamic Rashba effect.
- At the critical temperature, a reduced exciton recombination lifetime and enhanced circularly polarized photoluminescence were observed.
- A van der Waals heterostructure construction led to a 3-fold increase in polarization.
Conclusions:
- Local inversion symmetry breaking, caused by Pb atom displacement, is the key mechanism for the dynamic Rashba effect.
- The dynamic Rashba effect significantly influences exciton dynamics in 2D perovskites.
- Findings provide crucial insights for developing advanced 2D perovskite-based spintronic and optoelectronic technologies.
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