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Unconventional entanglement scaling and quantum criticality in the long-range spin-one Heisenberg chain with single-ion anisotropy

Patrick Adelhardt1,2,3,*, Sean R. Muleady2,3, Kai P. Schmidt1, and Alexey V. Gorshkov2,3

  • *Contact author: patrick.adelhardt@fau.de
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Phys. Rev. Research 8, 033363 – Published 25 September, 2026

DOI: https://doi.org/10.1103/3cyg-8wsw

Abstract

Long-range interactions can fundamentally reshape the low-energy properties of low-dimensional quantum matter, altering both continuous-symmetry breaking (CSB) and topological phenomena. However, their impact on the quantum criticality separating these regimes remains poorly understood. We determine the ground-state phase diagram and critical properties of the spin-one Heisenberg chain with single-ion anisotropy and staggered antiferromagnetic power-law interactions, using matrix-product state calculations complemented by high-order series expansions (perturbative continuous unitary transformations + Monte Carlo). Such long-range, nonfrustrated interactions circumvent the Hohenberg-Mermin-Wagner theorem, thereby stabilizing CSB phases in direct competition with the Haldane phase. We map out the resulting phase diagram and analyze the entanglement entropy scaling behavior in the U(1) and SU(2) CSB phases, finding logarithmic corrections beyond the short-range, universal contributions expected from linearly dispersed Goldstone modes. We further characterize all critical boundaries through finite-size scaling of either the entanglement entropy or the staggered magnetization. In particular, the large-D-to-U(1)-CSB transition exhibits unconventional, continuously varying critical exponents as a function of the long-range decay exponent with a strong dependence on the imposed boundary conditions leading to distinct finite-size scalings for sufficiently long-range potentials. Remarkably, the Haldane-to-U(1)-CSB transition likewise displays unconventional quantum criticality with distinct continuously varying critical exponents. Our work positions this model as a target for near-term atomic platforms with tunable long-range couplings and exhibiting natural single-ion anisotropy, offering a minimal playground for exploring the interplay between long-range interactions, continuous symmetry breaking, and topology.

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Phys. Rev. Research 8, 033363– Published 25 September, 2026
  • Received 22 April 2026
  • Accepted 5 September 2026
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