Tue, Apr 23, 2019, 4:30 pm

Location:

Speaker(s):

Amanda Young

University of Arizona, Tucson

The one-dimensional AKLT spin chain is the prototypical example of a frustration-free quantum spin system with a spectral gap above its ground state. Affleck, Kennedy, Lieb, and Tasaki conjectured that the two-dimensional version of their model on the hexagonal lattice also exhibits a spectral gap. In this talk, we introduce a family of variants of the hexagonal AKLT model, defined by decorating each edge of the lattice with an AKLT chain of length n, and prove that these decorated models are gapped for all n ≥ 3.