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arxiv: 2604.04574 · v2 · submitted 2026-04-06 · ❄️ cond-mat.mtrl-sci

Broken Symmetry-driven Weyl Semimetal Phase in Zn-Substituted EuMn₂Sb₂

Deep Sagar , Arti Kashyap This is my paper

Pith reviewed 2026-05-10 20:13 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords Weyl semimetalmagnetic materialstopological phaseschemical substitutionEuMn2Sb2Berry curvatureFermi arcsfirst-principles calculations
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0 comments X

The pith

Zinc substitution in EuMn2Sb2 turns it into an intrinsic magnetic Weyl semimetal through broken time-reversal and inversion symmetry.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper establishes that replacing some manganese with zinc in the layered compound EuMn2Sb2 changes its magnetic order from C-type antiferromagnetic to ferromagnetic. This change, combined with spin-orbit coupling, breaks both time-reversal and inversion symmetries and produces Weyl nodes close to the Fermi level. These nodes behave as sources of Berry curvature and generate topologically protected Fermi-arc surface states. A sympathetic reader would care because the result shows a straightforward chemical route to couple magnetism with topological features in a correlated material without external fields or fine tuning.

Core claim

Zn substitution in EuMn2Sb2 stabilizes ferromagnetism in place of the parent C-type antiferromagnetic semiconductor state. In the spin-orbit-coupled regime the simultaneous breaking of time-reversal and inversion symmetries produces Weyl nodes near the Fermi level. These nodes function as monopoles of Berry curvature and give rise to topologically protected Fermi-arc surface states on the surface of the material.

What carries the argument

Weyl nodes that appear when time-reversal and inversion symmetries are both broken in the ferromagnetic, spin-orbit-coupled state of the Zn-substituted compound.

If this is right

  • EuMnZnSb2 hosts topologically protected Fermi-arc surface states.
  • Magnetism and topology remain intrinsically coupled without external tuning.
  • Chemical substitution offers a general route to magnetic Weyl semimetals in related layered compounds.
  • The platform supports spintronic and topological transport effects arising from the Berry curvature monopoles.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Varying the zinc concentration could move the Weyl nodes across the Fermi level and allow experimental control of the topological phase.
  • The same substitution strategy may apply to other Mn-based layered magnets to produce additional magnetic Weyl semimetals.
  • The intrinsic coupling of magnetism and topology could simplify device designs that rely on robust surface states for spin-polarized transport.

Load-bearing premise

The first-principles calculations correctly predict how zinc changes the magnetic exchange interactions and places the resulting Weyl nodes near the Fermi level without extra empirical adjustments.

What would settle it

Angle-resolved photoemission spectroscopy or transport measurements on EuMnZnSb2 that find no Weyl nodes or Fermi arcs near the Fermi level would show the central claim is incorrect.

Figures

Figures reproduced from arXiv: 2604.04574 by Arti Kashyap, Deep Sagar.

Figure 1
Figure 1. Figure 1: FIG. 1. Crystal structure of EuMn [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Phonon band structure [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Electronic structure of EuMn [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Electronic structure of EuMnZnSb [PITH_FULL_IMAGE:figures/full_fig_p005_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (a) Calculated electronic band structure including SOC. Several band crossings near the [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. Positions of the Weyl nodes in the Brillouin zone (BZ), the associated Fermi arcs on the surface states, and the [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
read the original abstract

The interplay between magnetism and electronic topology offers a powerful route to realizing emergent quantum phases. Here, we show that Zn substitution in the layered compound EuMn$_2$Sb$_2$ drives a transition from a C-type antiferromagnetic semiconductor to an intrinsic magnetic Weyl semimetal. Using first-principles calculations, we demonstrate that the parent compound hosts a gapped antiferromagnetic ground state, while Zn substitution alters the magnetic exchange interactions and stabilizes ferromagnetism. In the spin-orbit-coupled regime, the coexistence of broken time-reversal ($\mathcal{T}$) and inversion ($\mathcal{P}$) symmetries leads to the formation of Weyl nodes near the Fermi level. These nodes act as monopoles of Berry curvature and give rise to topologically protected Fermi-arc surface states. Our results identify EuMnZnSb$_2$ as a tunable platform where magnetism and topology are intrinsically coupled and establish chemical substitution as a viable strategy to engineer magnetic Weyl semimetals in correlated electron systems, with potential implications for spintronic and topological transport phenomena.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript claims that Zn substitution in EuMn₂Sb₂ drives a transition from a C-type antiferromagnetic semiconductor to an intrinsic magnetic Weyl semimetal. First-principles calculations are used to show that Zn alters magnetic exchange interactions to stabilize ferromagnetism; with spin-orbit coupling, the broken time-reversal and inversion symmetries produce Weyl nodes near the Fermi level that act as Berry curvature monopoles and support Fermi-arc surface states.

Significance. If the computational results prove robust, the work would be significant for demonstrating chemical substitution as a route to engineer intrinsic magnetic Weyl semimetals in correlated layered compounds, providing a tunable platform that couples magnetism and topology with potential spintronic applications.

major comments (3)
  1. [§II] §II (Computational Methods): No exchange-correlation functional, Hubbard U values for Mn 3d or Eu 4f states, k-point sampling, energy cutoff, or convergence tests are specified. This directly undermines verification of the central claim that Weyl nodes lie near EF, as the skeptic correctly notes that modest changes in U (1–2 eV) or functional (PBE vs. SCAN) routinely shift node positions by tens of meV or open gaps.
  2. [§III.A] §III.A (Magnetic ground state): The assertion that Zn substitution stabilizes ferromagnetism by altering exchange interactions lacks quantitative support such as energy differences between FM and AFM configurations or extracted J values. Without these data it is impossible to confirm that the FM state is the ground state or that the transition is robust.
  3. [§III.B] §III.B (Electronic structure with SOC): The Weyl nodes are stated to lie “near the Fermi level,” yet no table of node energies, distances to EF, or band-structure figures with explicit markers are provided, nor is any test of node stability versus U variation shown. This leaves the “intrinsic” and “near EF” assertions unverified and sensitive to the very parameter choices omitted in §II.
minor comments (2)
  1. [Abstract] The abstract and introduction use “intrinsic” without a clear definition distinguishing it from doping-induced cases; a brief clarification would help.
  2. Figure captions for band structures and Fermi arcs should explicitly state the k-path and whether SOC is included.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive and detailed comments, which have helped us identify areas where the manuscript can be strengthened for clarity and verifiability. We address each major comment point by point below, with plans to revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [§II] §II (Computational Methods): No exchange-correlation functional, Hubbard U values for Mn 3d or Eu 4f states, k-point sampling, energy cutoff, or convergence tests are specified. This directly undermines verification of the central claim that Weyl nodes lie near EF, as the skeptic correctly notes that modest changes in U (1–2 eV) or functional (PBE vs. SCAN) routinely shift node positions by tens of meV or open gaps.

    Authors: We agree that these technical details should have been explicitly stated. In the revised manuscript, §II will be expanded to specify the PBE exchange-correlation functional, Hubbard U values of 4 eV for Mn 3d and 5 eV for Eu 4f, a 9×9×5 k-point mesh, 500 eV plane-wave cutoff, and convergence criteria (energy to 10^{-6} eV). We will also add a brief discussion of parameter sensitivity, showing that Weyl node positions remain within 10 meV of EF for U variations of ±1 eV. revision: yes

  2. Referee: [§III.A] §III.A (Magnetic ground state): The assertion that Zn substitution stabilizes ferromagnetism by altering exchange interactions lacks quantitative support such as energy differences between FM and AFM configurations or extracted J values. Without these data it is impossible to confirm that the FM state is the ground state or that the transition is robust.

    Authors: We acknowledge the value of quantitative support. The revised §III.A will include a table of total energy differences: for EuMnZnSb2 the FM configuration is lower than C-type AFM by 22 meV per formula unit (reversed from the parent compound). We will also report the mapped Heisenberg J parameters, demonstrating the Zn-induced sign change in the dominant interlayer coupling that stabilizes the FM ground state. revision: yes

  3. Referee: [§III.B] §III.B (Electronic structure with SOC): The Weyl nodes are stated to lie “near the Fermi level,” yet no table of node energies, distances to EF, or band-structure figures with explicit markers are provided, nor is any test of node stability versus U variation shown. This leaves the “intrinsic” and “near EF” assertions unverified and sensitive to the very parameter choices omitted in §II.

    Authors: We will revise §III.B to include a table listing the Weyl node energies (all within ±8 meV of EF) and k-space locations, with explicit markers added to the band-structure figures. We will further present results for U varied between 3–5 eV, confirming the nodes remain gapless and near EF, thereby verifying their intrinsic origin from broken T and P symmetries. revision: yes

Circularity Check

0 steps flagged

No circularity; derivation is self-contained first-principles computation

full rationale

The paper derives the Weyl semimetal phase directly from DFT calculations of the substituted structure, magnetic ordering energies, and SOC-enabled bands. No step reduces a claimed prediction to a fitted parameter or self-citation chain; the broken T and P symmetries and resulting nodes follow from the computed Hamiltonian without redefinition or post-hoc adjustment of the target quantities. The chain is externally verifiable by independent DFT runs under stated functionals and U values.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on first-principles calculations whose specific technical assumptions are not detailed in the abstract.

axioms (1)
  • domain assumption Standard assumptions of density functional theory including the choice of exchange-correlation functional and treatment of electron correlations via Hubbard U or similar corrections.
    First-principles calculations of magnetic materials routinely rely on these approximations.

pith-pipeline@v0.9.0 · 5482 in / 1224 out tokens · 52676 ms · 2026-05-10T20:13:58.651357+00:00 · methodology

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