期刊
PHYSICAL REVIEW LETTERS
卷 126, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.206804
关键词
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资金
- National Key R&D Program of China [2016YFA0301004, 2020YFA0308800, 2016YFA0301001, 2019YFA0308000]
- National Natural Science Foundation of China [11725418, 11427903, 61971035, 61901038, 61725107, 11874036, 11825404]
- Beijing Advanced Innovation Center for Future Chip (ICFC)
- Tsinghua University Initiative Scientific Research Program
- Tohoku-Tsinghua Collaborative Research Fund
- Beijing Natural Science Foundation [Z190006, 4192054]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
Researchers have reported direct experimental evidence of chiral symmetry breaking (CSB) in Li-intercalated graphene, showing gap opening at the Dirac point, Kekule-O type modulation, and chirality mixing near the gap edge. This work opens up opportunities for investigating CSB related physics in a Kekule-ordered graphene.
The low-energy excitations of graphene are relativistic massless Dirac fermions with opposite chiralities at valleys K and K'. Breaking the chiral symmetry could lead to gap opening in analogy to dynamical mass generation in particle physics. Here we report direct experimental evidences of chiral symmetry breaking (CSB) from both microscopic and spectroscopic measurements in a Li-intercalated graphene. The CSB is evidenced by gap opening at the Dirac point, Kekule-O type modulation, and chirality mixing near the gap edge. Our work opens up opportunities for investigating CSB related physics in a Kekule-ordered graphene.
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