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book part or chapter
A class of two-dimensional AKLT models with a gap
The 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 also conjectured that the two-dimensional version of their model on the hexagonal lattice exhibits a spectral gap. In this paper, we introduce a family of variants of the two-dimensional AKLT model depending on a positive integern, which is defined by decorating the edges of the hexagonal lattice with one-dimensional AKLT spin chains of lengthn. We prove that these decorated models are gapped for alln≥3.
Type
book part or chapter
Authors
Publication date
2020
Publisher
Published in
Contemporary Mathematics
ISBN of the book
978-1-4704-4841-7
Publisher place
Providence, Rhode Island
Start page
1
End page
21
EPFL units
Available on Infoscience
October 1, 2020
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