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Self-organisation into spatially modulated structures has different naturefrom phase transition into uniform states. Skyrmions and half-skyrmions(merons) are representatives of such structures and are utilised in designingmagnetoelectric, optical, and mechanoresponsive materials by controllingtopological phases. However, skyrmions and half-skyrmions in molecular solidsare rarely studied, though there is a universality in theoretical descriptionsbetween magnetic and molecular systems with chiral interactions. Here wedevelop a simple physical system for controlling topological phases in a solidwith chirality. We reveal that emergence of elastic fields from anisotropicsteric interactions and intermolecular twisting is a key to control helical andhalf-skyrmion structures. Utilising the coupling between the emergent elasticfields and molecular orientations, we successfully control topological phasesby temperature, external electromagnetic fields, and anisotropic stresses. Theconcept of the emergent elasticity provides a control system for designingmolecular and macromolecular solids with tunable electro- andmagneto-mechanical properties.

Emergent elasticity linked to topological phase transitions controlled via molecular chirality and steric anisotropy