A class of asymmetric gapped Hamiltonians on quantum spin chains and its   characterization III
  In this paper, we consider classification problem of asymmetric gapped Hamiltonians, which are given as the non-degenerate part of the Hamiltonians introduced in [O1]. We consider the $C^1$-classification, which takes into account the effect of boundaries. We show that the left and right degeneracies of edge ground states are the complete invariant. As a corollary, we consider the bulk-classification problem. We study Hamiltonians that1.are given by translation invariant finite range interactions, 2.are gapped in the bulk, 3.are frustration-free, 4.have uniformly bounded ground state degeneracy on finite intervals, and 5.have a unique bulk ground state. We show that for the bulk-classification, any such Hamiltonians are equivalent. 
Yoshiko Ogata
math-ph cond-mat.stat-mech math.MP quant-ph