Figure 4
Exciton energy bands [(a) and (b)] 
, [(c) and (d)] 
and [(e) and (f)] 
in the first Brillouin zone of a complex square lattice with two quantum dots in a unit cell for p = a/3 and ω = π/6, where ω is the angle between a and p and p is the distance between quantum dots in a unit cell [see inset in (a)]. Symbols Cμ (μ = 1,2,3,4) mark maxima at regular points of the reciprocal space. [(g)–(i)] Energies of six exciton bands at points Γ, M and X as functions of ω for p = a/2. [(j) and (k)] Exciton band energies at points Γ and M vs p for ω = π/4. Blue, red and green curves correspond to 
, 
and 
, respectively. Inset in (b) shows symmetry points in the reciprocal space.
