Fermionic symmetry-protected topological state in strained graphene

27 Aug 2017  ·  Wu Ying-Hai, Shi Tao, Sreejith G. J., Liu Zheng-Xin ·

The low-energy physics of graphene is described by relativistic Dirac fermions with spin and valley degrees of freedom. Mechanical strain can be used to create a pseudo magnetic field pointing to opposite directions in the two valleys... We study interacting electrons in graphene exposed to both an external real magnetic field and a strain-induced pseudo magnetic field. For a certain ratio between these two fields, it is proposed that a fermionic symmetry-protected topological state can be realized. The state is characterized in detail using model wave functions, Chern-Simons field theory, and numerical calculations. Our paper suggests that graphene with artificial gauge fields may host a rich set of topological states. read more

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Strongly Correlated Electrons Mesoscale and Nanoscale Physics