| المؤلفون: |
Xiong L; Columbia University, New York, New York 10027, United States., Li Y; Columbia University, New York, New York 10027, United States., Halbertal D; Columbia University, New York, New York 10027, United States., Sammon M; University of Minnesota, Minneapolis, Minnesota 55455, United States., Sun Z; Columbia University, New York, New York 10027, United States., Liu S; Kansas State University, Manhattan, New York 66506, United States., Edgar JH; Kansas State University, Manhattan, New York 66506, United States., Low T; University of Minnesota, Minneapolis, Minnesota 55455, United States., Fogler MM; University of California San Diego, La Jolla, California 92093, United States., Dean CR; Columbia University, New York, New York 10027, United States., Millis AJ; Columbia University, New York, New York 10027, United States.; Center for Computational Quantum Physics, The Flatiron Institute, New York, New York 10010, United States., Basov DN; Columbia University, New York, New York 10027, United States. |
| مستخلص: |
Topological spin textures are field arrangements that cannot be continuously deformed to a fully polarized state. In particular, merons are topological textures characterized by half-integer topological charge ±1/2 and vortex-like swirling patterns at large distances. Merons have been studied previously in the context of cosmology, fluid dynamics, condensed matter physics and plasmonics. Here, we visualized optical spin angular momentum of phonon polaritons that resembles nanoscale meron spin textures. Phonon polaritons, hybrids of infrared photons and phonons in hexagonal boron nitride, were excited by circularly polarized light incident on a ring-shaped antenna and imaged using infrared near-field techniques. The polariton field reveals a half-integer topological charge determined by the handedness of the incident beam. Our phonon polaritonic platform opens up new pathways to create, control, and visualize topological textures. |
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