Fig. 3: Spectral function.
From: Charge order in the kagome lattice Holstein model: a hybrid Monte Carlo study
Top: Momentum integrated spectral function A(ω) shown for a range of inverse temperatures from β = 2 to β = 24, at filling fraction 〈n〉 = 2/3 (with ω0 = 0.1, λD = 0.4). The linear lattice dimension is L = 15 i.e., Ns = 775. Bottom: a close-up view of the finite gap opening for β ≳ 18 where A(ω) = 0.
