期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7272
关键词
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资金
- 973 programmes [2013CB632703, 2013CB328702, 2012CB921900]
- National Natural Science Foundation [11304165, 11204155, 61205001]
- PCSIRT [IRT0149]
- 111 Project in China [B07013]
- Air Force Office of Scientific Research
- National Science Foundation in United States [PHY-1404510, CHE-1125935]
- European Social Fund
- National Resources
- action 'ARISTEIA' in the context of the Operational Programme 'Education and Lifelong Learning'
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1125935] Funding Source: National Science Foundation
Pseudospin, an additional degree of freedom inherent in graphene, plays a key role in understanding many fundamental phenomena such as the anomalous quantum Hall effect, electron chirality and Klein paradox. Unlike the electron spin, the pseudospin was traditionally considered as an unmeasurable quantity, immune to Stern-Gerlach-type experiments. Recently, however, it has been suggested that graphene pseudospin is a real angular momentum that might manifest itself as an observable quantity, but so far direct tests of such a momentum remained unfruitful. Here, by selective excitation of two sublattices of an artificial photonic graphene, we demonstrate pseudospin-mediated vortex generation and topological charge flipping in otherwise uniform optical beams with Bloch momentum traversing through the Dirac points. Corroborated by numerical solutions of the linear massless Dirac-Weyl equation, we show that pseudospin can turn into orbital angular momentum completely, thus upholding the belief that pseudospin is not merely for theoretical elegance but rather physically measurable.
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