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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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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
PubMed
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.

Keywords:
intrinsic Zeeman splittinglocal ferroelectricitynatural circular dichroismstrain induced chiralitysuper paramagnetic

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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.