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Open Access Publications from the University of California

Soliton-dependent plasmon reflection at bilayer graphene domain walls.

  • Author(s): Jiang, Lili;
  • Shi, Zhiwen;
  • Zeng, Bo;
  • Wang, Sheng;
  • Kang, Ji-Hun;
  • Joshi, Trinity;
  • Jin, Chenhao;
  • Ju, Long;
  • Kim, Jonghwan;
  • Lyu, Tairu;
  • Shen, Yuen-Ron;
  • Crommie, Michael;
  • Gao, Hong-Jun;
  • Wang, Feng
  • et al.

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Layer-stacking domain walls in bilayer graphene are emerging as a fascinating one-dimensional system that features stacking solitons structurally and quantum valley Hall boundary states electronically. The interactions between electrons in the 2D graphene domains and the one-dimensional domain-wall solitons can lead to further new quantum phenomena. Domain-wall solitons of varied local structures exist along different crystallographic orientations, which can exhibit distinct electrical, mechanical and optical properties. Here we report soliton-dependent 2D graphene plasmon reflection at different 1D domain-wall solitons in bilayer graphene using near-field infrared nanoscopy. We observe various domain-wall structures in mechanically exfoliated graphene bilayers, including network-forming triangular lattices, individual straight or bent lines, and even closed circles. The near-field infrared contrast of domain-wall solitons arises from plasmon reflection at domain walls, and exhibits markedly different behaviours at the tensile- and shear-type domain-wall solitons. In addition, the plasmon reflection at domain walls exhibits a peculiar dependence on electrostatic gating. Our study demonstrates the unusual and tunable coupling between 2D graphene plasmons and domain-wall solitons.

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