Achiral
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Related Articles from SNS
Achiral crystal reveals Raman optical activity through ferroaxial order
Raman optical activity, long thought to require chiral molecules or magnetic order, has been demonstrated in an achiral, nonmagnetic crystal by researchers at the Institute of Science Tokyo. The effect arises through ferroaxial order, a coordinated rotation of atoms within the lattice, and is detected using circularly polarized Raman spectroscopy. The findings show that optically inactive materials can also display chirality-like optical responses and expand the scope of optical techniques...
Rotation-to-translation conversion by geometric asymmetry in viscoelastic fluids
arXiv:2606.10268v1 Announce Type: new Abstract: Microscale locomotion in Newtonian fluids is constrained by kinematic reversibility. Here we show that viscoelasticity provides a distinct route: an achiral fore-aft asymmetric body rotating in a viscoelastic fluid generates net translation through normal-stress-driven secondary flows.
Electrically Tunable Heliconical Smectic Superstructure in Polar Fluids
arXiv:2512.05517v3 Announce Type: replace-cross Abstract: The ferroelectric nematic (NF) phase and related polar liquid-crystalline phases form a new class of strongly polarized yet fluid soft matter. Well-recognized heliconical ferroelectric phases such as NTBF and SmC_P^H exist, but their electro-optic functionality in smectic systems has been largely unexplored. Here, we report a newly designed single-component achiral molecule exhibiting a hierarchical polar phase sequence:...
Topological Edge States from Molecular Chirality: A General Framework for Dimerized Dipolar Arrays
arXiv:2606.00877v1 Announce Type: cross Abstract: We establish a general theoretical framework for realizing topological edge states in dimerized arrays of chiral dipolar molecules and demonstrate that molecular handedness provides a natural and tunable route to SSH-like topology in an interacting one-dimensional setting. Starting from an effective spin-$\tfrac{1}{2}$ model generated by Stark-dressed chiral molecules, we introduce bond dimerization and show that the chirality-induced...
Control of Electrons Spin Eliminates Hydrogen Peroxide Formation During Water Splitting
arXiv:2606.01648v1 Announce Type: new Abstract: The production of hydrogen through water splitting in a photoelectrochemical cell suffers from an overpotential that limits the efficiencies. In addition, hydrogen-peroxide formation is identified as a competing process affecting the oxidative stability of photoelectrodes.