Symmetry-protected topological phases and transition in a frustrated spin-$\frac{1}{2}$ XXZ chain

Abstract

Frustrated spin-$1/2$ XXZ zigzag chains relevant to Rb${}_2$Cu${}_2$Mo${}_3$O${}_{12}$ are revisited in the light of symmetry-protected topological (SPT) phases. Using a density-matrix renormalization group method for infinite systems, we identify projective representations for four distinct time-reversal invariant SPT phases; two parity-symmetric dimer phases near the Heisenberg and XX limits and two parity-broken vector-chiral (VC) dimer phases in between. A small bond alternation in the nearest-neighbor ferromagnetic exchange coupling induces a direct SPT transition between the two distinct VC dimer phases. It is also found numerically that two Berezinskii-Kosterlitz-Thouless transitions from the gapless to the two distinct gapped VC phases meet each other at a Gaussian criticality of the same Tomonaga-Luttinger parameter value as in the SU(2)-symmetric case.

arXiv comment6 pages, 2 figures, 1 table

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Cited by in corpus (11)

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• Exactly Solvable Points and Symmetry-Protected Topological Phases of Quantum Spins on a Zig-Zag Lattice
• One- and three-dimensional quantum phase transitions and anisotropy in Rb${}_2$Cu${}_2$Mo${}_3$O${}_{12}$
• Roles of easy-plane and easy-axis XXZ anisotropy and bond alternation on a frustrated ferromagnetic spin-$1/2$ chain
• Twice Hidden String Order and Competing Phases in the Spin-1/2 Kitaev-Gamma Ladder
• Emergent spin-$1$ Haldane gap and ferroelectricity in a frustrated spin-$1/2$ ladder
• Symmetry-protected topological phase transitions and robust chiral order on a tunable zigzag lattice
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• Exact quantization of topological order parameter in SU($N$) spin models, $N$-ality transformation and ingappabilities