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Experimental evidence of chiral symmetry breaking in Kekul\'e-ordered graphene

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arxiv 2106.01359 v1 pith:XQ5UQJQ4 submitted 2021-06-02 cond-mat.mes-hall

Changhua Bao , Hongyun Zhang , Teng Zhang , Xi Wu , Laipeng Luo , Shaohua Zhou , Qian Li , Yanhui Hou
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Wei Yao Liwei Liu Pu Yu Jia Li Wenhui Duan Hong Yao Yeliang Wang Shuyun Zhou
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classification cond-mat.mes-hall
keywords graphenebreakingchiralkekulsymmetrydirace-orderedexperimental
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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, Kekul\'e-O type modulation, and chirality mixing near the gap edge. Our work opens up opportunities for investigating CSB related physics in a Kekul\'e-ordered graphene.

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  1. Nodal lines in a honeycomb plasmonic crystal with synthetic spin

    physics.optics 2025-02 conditional novelty 6.0 of 10

    A four-band hexapole model of a honeycomb plasmonic crystal exhibits symmetry-enforced nodal loops around K and K' that survive weak symmetry breaking and can be gapped by a Kekulé distortion.

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