$J_{1} - J_{2} - δ$ model on a square lattice: From Altermagnet to Columnar antiferromagnet via quantum disordered phase

Subharthi Paul; Darshan G. Joshi

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arXiv · 2607.16415

$J_{1} - J_{2} - δ$ model on a square lattice: From Altermagnet to Columnar antiferromagnet via quantum disordered phase

Subharthi Paul·Darshan G. Joshi

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Abstract

Altermagnetism in the case of local-moment magnets is characterized by zero net magnetization and splitting of opposite chirality magnon bands in the absence of any spin-anisotropic interactions or external field. In this work we investigate the robustness of altermagnets against quantum fluctuations arising from magnetic frustration. We consider a Heisenberg model on a square lattice with two different types of second-neighbor interactions, as in a checkboard pattern, in addition to the nearest-neighbor interaction. This model continuously interpolates between the $J_{1}-J_{2}$ Heisenberg model on the square lattice and the Heisenberg model on the checkerboard lattice. For weaker second-neighbor interactions a Néel-type altermagnet phase is realized. On the other hand, for stronger second-neighbor interactions a columnar antiferromagnet emerges. Using linear spin-wave theory we calculate the magnon dispersion, order parameter, static and dynamical structure factors for the two magnetic phases. Further, we show that there is an intermediate quantum disordered phase separating the two magnetic phases, which is connected to the one realized in the $J_{1}-J_{2}$ model. The quantum disordered region is further stabilized as we tune towards the checkerboard lattice limit.

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Subharthi Paul, Darshan G. Joshi. 2026-07-17. $J_{1} - J_{2} - δ$ model on a square lattice: From Altermagnet to Columnar antiferromagnet via quantum disordered phase. https://arxiv.org/abs/2607.16415

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