Fig. 3: Zitterbewegung in honeycomb lattice.

a Schematic of the honeycomb lattice structure resonantly excited at one point with the photons propagating away along the structure. b Intensity vs. x and y recorded for excitation at the black point in panel (c). Colour scale gives the intensity I relative to the peak intensity \(I_0\) in decibel units. The zero of the y-axis is defined as the edge of the lattice where the pump spot is incident. c Dispersion relation of the honeycomb lattice measured by angle-resolved photoluminescence spectroscopy without polarisation resolution. Colour scale gives the intensity relative to the peak value. The red and black points mark the excitation energies and corresponding incidence wavevectors at which the Zitterbewegung effect is studied. d, e Dispersion of the p-bands (d) and s-bands (e) calculated by a tight binding model with parameters from ref. ¹⁶. Red and blue curves represent states linearly polarised along x and y, respectively