Simulating Bulk Gap in Chiral Projected Entangled-Pair States
The research develops a variational principle for excited states within Projected Entangled-Pair States (PEPS) to reliably characterize gapped bulk excitations in chiral topological phases. By analyzing correlation functions, the method demonstrates that decay faster than r^-2 does not imply gapless modes, successfully validating PEPS as a tool for studying gapped excitations in chiral spin liquids.