Daniel Ayala Feliciano

Spectral-Gap Corrections in Finite Open SU(2) Plaquette Strips: Second- and Fourth-Order Results for Two to Five Plaquettes

This preprint investigates perturbative spectral-gap corrections in finite open SU(2) plaquette-strip Hamiltonians. An analytical second-order effective Hamiltonian is developed for finite strips, yielding an explicit positive second-order correction to the gap. Fourth-order corr...