Berry phase induced dimerization in one-dimensional quadrupolar systems

Abstract

We investigate the effect of the Berry phase on quadrupoles that occur for example in the low-energy description of spin models. Specifically we study here the one-dimensional bilinear-biquadratic spin-one model. An open question for many years about this model is whether it has a non-dimerized fluctuating nematic phase. The dimerization has recently been proposed to be related to Berry phases of the quantum fluctuations. We use an effective low-energy description to calculate the scaling of the dimerization according to this theory, and then verify the predictions using large scale density-matrix renormalization group (DMRG) simulations, giving good evidence that the state is dimerized all the way up to its transition into the ferromagnetic phase. We furthermore discuss the multiplet structure found in the entanglement spectrum of the ground state wave functions.

4.5 pages + 4 pages supplementary material, 4 figures

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• The quadrupolar phases of the S=1 bilinear-biquadratic Heisenberg model on the triangular lattice
• Spin nematic correlations in bilinear-biquadratic S=1 spin chains
• Classifying Novel Phases of Spinor Atoms
• Phase diagram of spin-1 bosons on one-dimensional lattices
• Quantum spin nematics, dimerization, and deconfined criticality in quasi-one dimensional spin-1 magnets

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