1. Non-Landau quantum phase transition in modulated SU(N) Heisenberg spin chains
- Author
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Capponi, Sylvain, Devos, Lukas, Lecheminant, Philippe, Totsuka, Keisuke, and Vanderstraeten, Laurens
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Quantum Gases - Abstract
We investigate the nature of the quantum phase transition in modulated SU(N) Heisenberg spin chains. In the odd-N case, the transition separates a trivial non-degenerate phase to a doubly-degenerate gapped chiral PSU(N) symmetry-protected topological (SPT) phase which breaks spontaneously the inversion symmetry. The transition is not an Ising transition associated to the breaking of the $\mathbb{Z}_2$ inversion symmetry, but is governed by the delocalization of the edge states of the SPT phase. In this respect, a modulated SU(N) Heisenberg spin chain provides a simple example in one dimension of a non-Landau phase transition which is described by the SU(N)$_1$ conformal field theory. We show that the chiral SPT phase exhibits fractionalized spinon excitations, which can be confined by changing the model parameters slightly., Comment: 13 pages, 12 figures
- Published
- 2024