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Strain-Engineered Lattice-Driven Chirality in CsPbBr3 Nanorods.
Suhas K T1, Tanu Sharma2, Lakshmi Madathil2
1Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre For Advanced Scientific Research, Bangalore, India.
Small (Weinheim an Der Bergstrasse, Germany)
|March 18, 2026
Summary
Strain-induced lattice chirality in cesium lead bromide (CsPbBr3) nanorods creates unique optical and magnetic properties. This discovery offers new possibilities for chiral optoelectronics and spin-selective devices.
Area of Science:
- Materials Science
- Solid-State Physics
- Nanotechnology
Background:
- Chirality in halide perovskites is typically ligand- or molecule-driven.
- Understanding intrinsic lattice-driven chirality is crucial for novel material properties.
Purpose of the Study:
- To demonstrate intrinsic lattice-driven chirality in CsPbBr3 nanorods.
- To investigate the role of strain in inducing symmetry breaking and associated phenomena.
- To explore potential applications in chiral optoelectronics and spintronics.
Main Methods:
- Synthesis of highly quantum-confined CsPbBr3 nanorods.
- Characterization of lattice strain and octahedral distortion.
- Measurement of circular dichroism (CD) and natural circular dichroism (NCD).
- Analysis of polarization-dependent photoluminescence (PL).
- Piezoresponse force microscopy, magnetization, and magneto-optical measurements.
Main Results:
- Demonstrated intrinsic lattice-driven chirality due to significant strain-induced octahedral distortion.
- Observed strong CD, NCD, and polarization-dependent PL persisting to room temperature.
- Confirmed local ferroelectricity and a diamagnetic to superparamagnetic transition.
- Revealed nonlinear Zeeman response and zero-field magnetic signatures.
Conclusions:
- Strain is a potent mechanism for inducing chirality, ferroelectricity, and magneto-optical coupling in inorganic lattices.
- CsPbBr3 nanorods exhibit unique strain-mediated properties distinct from other chiral perovskites.
- This work paves the way for advanced chiral optoelectronic and spin-selective devices.
Keywords:
intrinsic Zeeman splittinglocal ferroelectricitynatural circular dichroismstrain induced chiralitysuper paramagneticMore Related Videos
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