Send to

Choose Destination
Nat Mater. 2016 Aug;15(8):840-4. doi: 10.1038/nmat4653. Epub 2016 May 30.

Soliton-dependent plasmon reflection at bilayer graphene domain walls.

Author information

Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Physics Department, Tsinghua University, Beijing 100084, China.
Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Kavli Energy NanoSciences Institute at the University of California, Berkeley and the Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.


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.


Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center