One-Particle Resonances and Eigenstate Thermalization in Periodic Free-Fermion Lattices

We study eigenstate fluctuations of the particle number in the nearest-neighbour free-fermion model on the periodic cubic lattice (Z/LZ)ᵈ. For every fixed dimension, every particle number, every subvolume, and every normalized energy eigenstate, we prove a bound of order NLᵈ⁻¹ for the particle-number variance. The corresponding eigenstate-thermalization estimate is of order Lᵈ⁻¹/(Nη²) for fluctuations of relative size $η$. In particular, at positive particle density the bound decays as the inverse linear size. The proof decomposes the centered particle-number operator according to one-particle energy transfer and treats the zero- and nonzero-transfer components separately. The nonzero-transfer part is controlled by a sharp resonance bound, proved from Mann's theorem on relations among roots of unity, while the zero-transfer part is estimated by a Hilbert-Schmidt argument. These bounds are optimal in every dimension: the maximal nonzero-gap multiplicity has order Lᵈ⁻¹, and suitable many-body eigenstates realize matching variance lower bounds and show that the concentration bound cannot be improved in estimates uniform in the tolerance parameter.