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1. Chiral Photons from Chiral Gravitational Waves

   https://doi.org/10.1103/PhysRevLett.123.031305  

   Inomata, Keisuke; Kamionkowski, Marc (July 2019, Physical Review Letters)
2. Chiral Nanoceramics

   https://doi.org/10.1002/adma.201906738  

   Fan, Jinchen; Kotov, Nicholas_A (June 2020, Advanced Materials)

   Abstract The study of different chiral inorganic nanomaterials has been experiencing rapid growth during the past decade, with its primary focus on metals and semiconductors. Ceramic materials can substantially expand the range of mechanical, optical, chemical, electrical, magnetic, and biological properties of chiral nanostructures, further stimulating theoretical, synthetic, and applied research in this area. An ever‐expanding toolbox of nanoscale engineering and self‐organization provides a chirality‐based methodology for engineering of hierarchically organized ceramic materials. However, fundamental discoveries and technological translations of chiral nanoceramics have received substantially smaller attention than counterparts from metals and semiconductors. Findings in this research area are scattered over a variety of sources and subfields. Here, the diversity of chemistries, geometries, and properties found in chiral ceramic nanostructures are summarized. They represent a compelling materials platform for realization of chirality transfer through multiple scales that can result in new forms of ceramic materials. Multiscale chiral geometries and the structural versatility of nanoceramics are complemented by their high chiroptical activity, enantioselectivity, catalytic activity, and biocompatibility. Future development in this field is likely to encompass chiral synthesis, biomedical applications, and optical/electronic devices. The implementation of computationally designed chiral nanoceramics for biomimetic catalysts and quantum information devices may also be expected. 

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3. Chiral photon emission from a chiral–achiral perovskite heterostructure

   https://doi.org/10.1063/5.0180188  

   Hu, Yang; Chen, Ruiwen; Pendse, Saloni; Taniguchi, Takashi; Watanabe, Kenji; Jiang, Jie; Zhang, Lifu; Jia, Ru; Palermo, Edmund F; Wertz, Esther; et al (March 2024, Applied Physics Letters)

   Chiral semiconductors have been recently suggested as the basic building blocks for the design of chiral optoelectronic and electronic devices for chiral emission and spintronics. Herein, we report that through the formation of a chiral/achiral heterostructure, one can develop a chiral system that integrates the merits of both chiral and achiral components for developing a demanded chiral emitter. In the R-(+)-(or S-(−)-)1-(1-naphthyl)-ethylammonium lead bromide/CsPbBr3 heterostructure, we show that the photoluminescence of CsPbBr3 carries a degree of circular polarization of around 1% at room temperature. It is explained that such chiral emission is enabled through the chiral self-trapped exitonic absorption of R-(+)- (or S-(−)-)1-(1-naphthyl)-ethylammonium lead bromide. This work may provide an alternative way to generate bright circularly polarized light from achiral materials, which has potential applications in spintronics, biosensing, and signal encryption. 

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4. Supramolecular polymerization of chiral molecules devoid of chiral centers

   https://doi.org/10.1002/pi.6111  

   Henderson, Will_R; Castellano, Ronald_K (September 2020, Polymer International)

   Abstract The iterative association of monomer units through noncovalent interactions often leads to chiral supramolecular polymers. Monomers comprising these materials can be further divided into those with chiral centers and those without. The latter class is often less studied but attractive since it features monomer designs with chirality at the core rather than the periphery of the molecules. In this mini‐review, we summarize the existing strategies to construct supramolecular polymers from chiral molecules with no chiral centers and offer perspectives on fundamental trends and differences between them and their counterparts with chiral centers. © 2020 Society of Industrial Chemistry 

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5. Diverse behaviors in non-uniform chiral and non-chiral swarmalators

   https://doi.org/10.1038/s41467-023-36563-4  

   Ceron, Steven; O’Keeffe, Kevin; Petersen, Kirstin (February 2023, Nature Communications)

   Abstract We study the emergent behaviors of a population of swarming coupled oscillators, dubbed swarmalators. Previous work considered the simplest, idealized case: identical swarmalators with global coupling. Here we expand this work by adding more realistic features: local coupling, non-identical natural frequencies, and chirality. This more realistic model generates a variety of new behaviors including lattices of vortices, beating clusters, and interacting phase waves. Similar behaviors are found across natural and artificial micro-scale collective systems, including social slime mold, spermatozoa vortex arrays, and Quincke rollers. Our results indicate a wide range of future use cases, both to aid characterization and understanding of natural swarms, and to design complex interactions in collective systems from soft and active matter to micro-robotics. 

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