Symmetry-protected topological phases in two-leg SU(N) spin ladder with unequal spins

30 Sep 2019 Capponi Sylvain Fromholz Pierre Lecheminant Philippe Totsuka Keisuke

Chiral Haldane phases are examples of one-dimensional topological states of matter which are protected by projective SU($N$) group (or its subgroup $\mathbb{Z}_N \times \mathbb{Z}_N$) with $N>2$. The unique feature of these symmetry protected topological (SPT) phases is that they are accompanied by inversion-symmetry breaking and the emergence of different left and right edge states which transform, for instance, respectively in the fundamental ($\boldsymbol{N}$) and anti-fundamental ($\overline{\boldsymbol{N}}$) representations of SU($N$)... (read more)

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