Shining a Light on Chiral Symmetry Breaking in Graphene
May 19, 2021•
Physics 14, 76
Sensitive photoemission measurements visualize the signatures of a symmetry-broken phase of graphene with carriers of mixed handedness.
C. Bao
Figure 1: (a) Graphene lattice and unit cell (orange diamond) highlighting the distinct A and B sublattices (inset). (b) Schematic of graphene pseudospin chirality around each Dirac point (
K and
Kʹ) in the graphene Brillouin zone (orange hexagon). (c) Graphene with a lattice of lithium atoms creating a new Kekulé-O bond pattern (purple diamond). (d) The Kekulé pattern results in the Dirac cones being superimposed on the new, smaller Kekulé Brillouin zone (purple hexagon). The new Dirac cones are simultaneously right and left handed and so no longer chiral.(a) Graphene lattice and unit cell (orange diamond) highlighting the distinct A and B sublattices (inset). (b) Schematic of graphene pseudospin chirality around each Dirac point (