Emergent elasticity linked to topological phase transitions controlled via molecular chirality and steric anisotropy
arXiv:2107.14709 · doi:10.1073/pnas.2118492119
Abstract
Self-organisation into spatially modulated structures has different nature from phase transition into uniform states. Skyrmions and half-skyrmions (merons) are representatives of such structures and are utilised in designing magnetoelectric, optical, and mechanoresponsive materials by controlling topological phases. However, skyrmions and half-skyrmions in molecular solids are rarely studied, though there is a universality in theoretical descriptions between magnetic and molecular systems with chiral interactions. Here we develop a simple physical system for controlling topological phases in a solid with chirality. We reveal that emergence of elastic fields from anisotropic steric interactions and intermolecular twisting is a key to control helical and half-skyrmion structures. Utilising the coupling between the emergent elastic fields and molecular orientations, we successfully control topological phases by temperature, external electromagnetic fields, and anisotropic stresses. The concept of the emergent elasticity provides a control system for designing molecular and macromolecular solids with tunable electro- and magneto-mechanical properties.
arXiv comment21 pages, 5 figures, 8 extended data figures
References in corpus (16)
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Spinor Bose Condensates in Optical Traps
- Bose-Einstein condensation with internal degrees of freedom in alkali atom gases
- Emergent electrodynamics of skyrmions in a chiral magnet
- Amorphous Systems in Athermal, Quasistatic Shear
- Multiple-q states and skyrmion lattice of the triangular-lattice Heisenberg antiferromagnet under magnetic fields
- 2D Melting: From Liquid-Hexatic Coexistence to Continuous Transitions
- Assembly and Phase Transitions within Colloidal Crystals
- Fluctuation-induced first-order phase transition in Dzyaloshinskii-Moriya helimagnets
- Melting a skyrmion lattice topologically: through the hexatic phase to a skyrmion liquid
- Molecular engineering of chiral colloidal liquid crystals using DNA origami
- Entropy-driven formation of prolate and oblate cholesteric phases by computer simulations
- Hierarchical organization of chiral rafts in colloidal membranes
- Topological states in chiral active matter: dynamic blue phases and active half-skyrmions
- Orientational glass in mixtures of elliptic and circular particles: Structural heterogeneities, rotational dynamics, and rheology
- Ferroelectric glass of spheroidal dipoles with impurities: Polar nanoregions, response to applied electric field, and ergodicity breakdown