Fig. 1: Illustration of the 2D SSH model.
From: Observation of gapped Dirac cones in a two-dimensional Su-Schrieffer-Heeger lattice
a, c Schematic drawing of the 2D SSH model. The rectangle lattice has homogeneous hopping (a) and alternative hopping in y direction and staggered potential energy in x direction (c), respectively. The hopping strengths of electrons are illustrated by the thickness of the bonds. The color of different atoms indicates different on-site energy. b, d Calculated band structures of (a) and (c), respectively. Red arrows in b indicate the gapless Dirac cones at the M point.
