Fermionic symmetry-protected topological state in strained graphene

Wu, Ying-Hai; Shi, Tao; Ganesh Jaya, Sreejith; Liu, Zheng-Xin

doi:10.1103/PhysRevB.96.085138

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Fermionic symmetry-protected topological state in strained graphene

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Ganesh Jaya, Sreejith
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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https://journals.aps.org/prb/abstract/10.1103/PhysRevB.96.085138
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Citation

Wu, Y.-H., Shi, T., Ganesh Jaya, S., & Liu, Z.-X. (2017). Fermionic symmetry-protected topological state in strained graphene. Physical Review B, 96(8): 085138. doi:10.1103/PhysRevB.96.085138.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002E-2800-1

Abstract

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 pseudomagnetic 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 pseudomagnetic 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.