摘要
Optical skyrmions, quasiparticles that are characterized by the topologically nontrivial vectorial textures of optical parameters such as the electromagnetic field, Stokes parameters, and spin angular momentum, have aroused great attention recently. New dimensions for optical information processing, transfer, and storage have become possible, and developing multiple schemes for manipulating the topological states of skyrmions, thus, is urgent.Here we propose an approach toward achieving dynamic modulation of skyrmions via changing the field symmetry and adding chirality. We demonstrate that field symmetry governs the skyrmionic transformation between skyrmions and merons, whereas material chirality modulates the twist degree of fields and spins and takes control of the Néel-type–Bloch-type skyrmionic transition. Remarkably, the enantioselective twist of skyrmions and merons results from the longitudinal spin arising from the chirality-induced splitting of the hyperboloid in the momentum space. Our investigation, therefore, acts to enrich the portfolio of optical quasiparticles. The chiral route to topological state transitions will deepen our understanding of light–matter interaction and pave the way for chiral sensing, optical tweezers, and topological phase transitions in quantum matter.
基金
National Key Research and Development Program of China(2018YFB1801801)
Guangdong Major Project of Basic Research(2020B0301030009)
National Natural Science Foundation of China(61935013,61975133,62075139,12047540,12104318)
Natural Science Foundation of Guangdong Province(2020A1515011185)
Science,Technology and Innovation Commission of Shenzhen Municipality(JCYJ20180507182035270,JCYJ20200109114018750,KQJSCX20170727100838364,RCJC20200714114435063,ZDSYS201703031605029)
Shenzhen Peacock Plan(KQTD20170330110444030)
Shenzhen University(2019075)
China Postdoctoral Science Foundation(2021M702272).