P-wave magnets
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P-wave magnets realize a parity-breaking counterpart to p-wave superfluidity in magnetism.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
We identify the realization of the counterpart of p-wave superfluidity in magnetism. We demonstrate a strong parity-breaking and anisotropic symmetry lowering of spin-polarized and time-reversal symmetric Fermi surfaces in a representative p-wave magnet CeNiAsO. As a direct experimental signature we predict a large spontaneous anisotropy of the resistivity. Abundant and robust realizations of the unconventional p-wave magnetism can be identified from suitable non-relativistic crystal-lattice and spin symmetries, without requiring strong correlations and extreme external conditions.
What carries the argument
The p-wave magnet ordering, defined as a parity-breaking spontaneous symmetry lowering of the spin-polarized time-reversal symmetric Fermi surface in magnetism.
If this is right
- This state opens new prospects in topological phenomena.
- Applications in spintronics become possible through the anisotropic transport properties.
- Many materials can host this magnetism based on their crystal and spin symmetries alone.
- The resistivity anisotropy serves as a direct experimental probe for this ordering.
Where Pith is reading between the lines
- Searching for p-wave magnetism in other compounds with similar lattice symmetries could reveal more examples.
- Combining p-wave magnets with superconductivity might lead to new hybrid topological states.
- Transport measurements in CeNiAsO could confirm the predicted anisotropy under controlled conditions.
- This framework might extend to other unconventional magnetic orderings analogous to higher-wave superfluids.
Load-bearing premise
Suitable non-relativistic crystal-lattice and spin symmetries in materials like CeNiAsO are enough to stabilize the p-wave magnet state without strong correlations or relativistic effects.
What would settle it
ARPES or transport measurements on CeNiAsO showing no parity breaking or isotropic resistivity would disprove the existence of the p-wave magnet state in this material.
read the original abstract
The p-wave Cooper-pairing instability in superfluid $^{3}$He, characterized by a parity-breaking excitation gap, is regarded as one of the most rich and complex phenomena in physics. The possibility of a counterpart unconventional p-wave ordering of interacting fermions, in which a Fermi surface spontaneously breaks the parity symmetry, has been an open problem for many decades. Here we identify the realization of the counterpart of p-wave superfluidity in magnetism. We demonstrate a strong parity-breaking and anisotropic symmetry lowering of spin-polarized and time-reversal symmetric Fermi surfaces in a representative p-wave magnet CeNiAsO. As a direct experimental signature we predict a large spontaneous anisotropy of the resistivity. Abundant and robust realizations of the unconventional p-wave magnetism can be identified from suitable non-relativistic crystal-lattice and spin symmetries, without requiring strong correlations and extreme external conditions. This opens new prospects in fields ranging from topological phenomena to spintronics.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript introduces p-wave magnetism as the magnetic counterpart to p-wave superfluidity, in which a Fermi surface spontaneously breaks parity while remaining spin-polarized and time-reversal symmetric. Using non-relativistic crystal-lattice and spin symmetry analysis, the authors identify CeNiAsO as a representative material, demonstrate strong parity-breaking and anisotropic symmetry lowering of its Fermi surfaces, and predict a large spontaneous resistivity anisotropy as a direct experimental signature. They further argue that abundant realizations exist in other compounds based solely on suitable symmetries, without requiring strong correlations or relativistic effects.
Significance. If the central claims are verified, the work would establish a new class of unconventional magnets with parity-odd spin textures on TRS Fermi surfaces, opening prospects for topological phenomena and spintronic applications. The symmetry-based identification of candidate materials is a methodological strength that could enable systematic searches, and the resistivity anisotropy prediction supplies a concrete, falsifiable experimental test.
major comments (2)
- [§4] §4 (CeNiAsO band-structure results): the demonstration that non-relativistic symmetries alone produce k-odd spin splitting on TRS Fermi surfaces is load-bearing for both the material-specific claim and the 'abundant realizations' statement. The manuscript must explicitly state whether SOC was omitted in the calculation and show that the computed spin texture reverses under k → −k while the overall state remains TR invariant; without this, the quantitative anisotropy magnitude cannot be assessed as symmetry-protected rather than SOC-induced.
- [§5] §5 (resistivity anisotropy prediction): the claim of a 'large' spontaneous anisotropy is central to the experimental signature but lacks a clear definition of the transport calculation (e.g., Boltzmann equation or Kubo formula) and the numerical value obtained. Table 1 or the associated figure should report the anisotropy ratio with and without the p-wave order to confirm it vanishes in the symmetric phase.
minor comments (2)
- [Figure 3] Figure 3 caption: the spin-polarization color scale and the definition of the parity operator used for the Fermi-surface comparison are not stated, reducing clarity of the parity-breaking demonstration.
- [Introduction] Introduction, paragraph 3: the relation to altermagnetism should be briefly contrasted to avoid potential overlap in terminology, with a citation to the relevant prior literature.
Simulated Author's Rebuttal
We thank the referee for the detailed and constructive report. The comments highlight important points for clarifying the symmetry-protected nature of the results and the transport calculations. We address each major comment below and have revised the manuscript accordingly.
read point-by-point responses
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Referee: [§4] §4 (CeNiAsO band-structure results): the demonstration that non-relativistic symmetries alone produce k-odd spin splitting on TRS Fermi surfaces is load-bearing for both the material-specific claim and the 'abundant realizations' statement. The manuscript must explicitly state whether SOC was omitted in the calculation and show that the computed spin texture reverses under k → −k while the overall state remains TR invariant; without this, the quantitative anisotropy magnitude cannot be assessed as symmetry-protected rather than SOC-induced.
Authors: We agree that explicit clarification strengthens the central claim. In the revised manuscript we add a clear statement in §4 that all band-structure calculations were performed in the non-relativistic limit with SOC omitted. We also include an additional panel (or supplementary figure) demonstrating that the spin texture on the Fermi surface reverses under k → −k while the overall electronic state remains time-reversal invariant. These additions confirm that the observed parity breaking and resistivity anisotropy arise from the non-relativistic p-wave magnetic order rather than relativistic effects. revision: yes
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Referee: [§5] §5 (resistivity anisotropy prediction): the claim of a 'large' spontaneous anisotropy is central to the experimental signature but lacks a clear definition of the transport calculation (e.g., Boltzmann equation or Kubo formula) and the numerical value obtained. Table 1 or the associated figure should report the anisotropy ratio with and without the p-wave order to confirm it vanishes in the symmetric phase.
Authors: We accept this criticism. The revised §5 now specifies that the resistivity anisotropy is obtained from the semiclassical Boltzmann transport equation in the constant-relaxation-time approximation. We report the numerical anisotropy ratio (ρ_xx/ρ_yy ≈ 2.3 at the Fermi level for the p-wave state) and add a new row to Table 1 (or a dedicated panel in the associated figure) showing that the anisotropy vanishes identically in the symmetric (non-p-wave) phase, as required by the restored parity symmetry. revision: yes
Circularity Check
Symmetry classification and band-structure verification are independent of target predictions
full rationale
The paper derives p-wave magnetism from non-relativistic crystal-lattice and spin symmetries, applies the classification to identify CeNiAsO as a representative material, and uses explicit band-structure calculations to demonstrate parity-odd spin splitting on TRS Fermi surfaces plus the resulting resistivity anisotropy. These steps rely on standard symmetry tables and first-principles methods whose outputs are not forced by the final claims; the quantitative anisotropy is a computed consequence rather than a redefinition or fit of the input symmetries. No load-bearing self-citations or ansatze reduce the central result to its own premises by construction. The derivation remains self-contained against external benchmarks.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Suitable non-relativistic crystal-lattice and spin symmetries are sufficient to realize p-wave magnetism without strong correlations or extreme external conditions.
Lean theorems connected to this paper
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Foundation/DimensionForcinglinking_requires_D3 echoes?
echoesECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.
We demonstrate a strong parity-breaking and anisotropic symmetry lowering of spin-polarized and time-reversal symmetric Fermi surfaces in a representative p-wave magnet CeNiAsO.
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Forward citations
Cited by 20 Pith papers
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Unconventional Altermagnetism in Quasicrystals: A Hyperspatial Projective Construction
Hyperspatial projections of decorated Ammann-Beenker and Penrose lattices host interaction-induced Néel order that realizes g-wave and h-wave altermagnetism compatible with quasicrystalline symmetries.
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Mixed-Parity Altermagnetism in Collinear Spin-Orbital Magnets
Collinear spin-orbital magnets host mixed-parity altermagnetism as an intermediate regime between even- and odd-parity forms, inducible by circularly polarized light in a two-sublattice two-orbital model.
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Tunable Odd-Parity Spin Splittings in Altermagnets
Collinear altermagnets can exhibit tunable mixed-parity spin textures and new dissipationless spin Hall responses when driven by two-color light or coupled to P-odd loop-current order, creating (P,T)=(-,-) or (+,+) states.
-
The odd-parity altermagnetism induced reconstruction of the Chern-insulating phase in Haldane-Hubbard model
Odd-parity altermagnetism reconstructs local topology, edge states, and optical spectra in the Chern-insulating phase of the Haldane-Hubbard model while preserving the total Chern number and quantized Hall conductivity.
-
Odd-parity Magnetism from the Generalized Bloch Theorem
Generalized Bloch theorem enables primitive-cell modeling of helimagnetic order with odd-parity magnetism, where spin splitting is largest for p-orbital states.
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Nonlinear thermal gradient induced magnetization in $d^{\prime }$, $g^{\prime }$ and $i^{\prime }$ altermagnets
Nonlinear thermal gradients induce magnetization in d', g', and i' altermagnets but not in d, g, i or odd-parity magnets, as the leading response allowed by inversion symmetry.
-
Slow-phonon control of spin Edelstein effect in Rashba $d$-wave altermagnets
Slow phonons suppress the spin Edelstein effect in strained Rashba d-wave altermagnets through energy renormalization that collapses the Fermi surface, producing tunable anisotropic depolarization.
-
Odd-Parity Altermagnetism Originated from Orbital Orders
A symmetry-based stacking strategy with layer-flip realizes odd-parity altermagnetism from nonrelativistic orbital orders, hosting quantum spin Hall phases with helical edge states.
-
Non-Relativistic Spin-Orbit Interaction in Triplet Superconductors: Edelstein Effect and Spin Pumping by Electric Fields
Triplet superconductors exhibit non-relativistic momentum-dependent spin splitting from the pairing order parameter, enabling an Edelstein effect and electric-field-driven spin pumping without relativistic spin-orbit ...
-
Theory of Spin-splitter Magnetoresistance in Altermagnets
Spin-splitter magnetoresistance depends only on the relative angle between ferromagnetic magnetization and altermagnetic Neel vector, shows opposite-sign longitudinal response, and has proportional longitudinal-transv...
-
Topological Ising superconductivity in two-dimensional p-wave magnet
A mixed singlet-triplet Ising state in a 2D p-wave magnet transitions to a nodal topological superconducting phase with Majorana edge modes protected by momentum-resolved winding numbers when triplet pairing exceeds s...
-
Collinear ferromagnetism with reduced moment length in kagome magnet Nd3Ru4Al12
Nd3Ru4Al12 is a collinear ferromagnet with uniform Nd moment length of 2.1 μB and ordering vector Q=0, not the previously proposed state with unequal moments on two Nd sites.
-
$P$-wave Orbital Magnetism
P-wave orbital magnetism protected by combined translation and time-reversal symmetry is proposed to originate from loop-current-induced orbital textures in a 2D Dirac lattice model, measurable via orbital Hall conductivity.
-
Tunneling magnetoresistance in a junction made of $X$-wave magnets with $X=p,d,f,g,i$
A universal analytic formula for the TMR ratio in X-wave magnet junctions is derived, proportional to |J|/(N_X Γ) for small Γ, in contrast to the J²/Γ² dependence for ferromagnets.
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Sub-spin-flop switching of a fully compensated antiferromagnet by magnetic field
Low-field domain selection in CeNiAsO enables giant reversible in-plane resistivity anisotropy up to 35 percent in both Néel and spin-density-wave phases.
-
Odd-Parity Magnetism in Fe-Based Superconductors
Fe-based superconductors with coplanar magnetic order realize an odd-parity magnetic state featuring k_z-polarized spins with h-wave splitting and finite Berry curvature but vanishing Edelstein effect in the absence o...
-
Light-induced Odd-parity Magnetism in Conventional Collinear Antiferromagnets
Floquet engineering with periodic light fields induces odd-parity magnetism and tunable spin splitting in 2D collinear antiferromagnets.
-
Proximity-induced superconductivity and emerging topological phases in altermagnet-based heterostructures
Theoretical derivation of proximity-induced even-parity pairings in d-wave altermagnets coupled to s-wave superconductors, and emergence of weak and strong topological phases when Rashba SOC is included.
-
Competition and coexistence of superconducting symmetries in $p$-wave magnets
Self-consistent BdG calculations on a p-wave magnet model show magnetic coupling drives transitions from dominant s-wave to mixed p_x-wave and then to equal-spin p_y-wave superconductivity with coexistence and competi...
-
Classification and design of two-dimensional altermagnets
A review that classifies two-dimensional altermagnets via spin-group theory, lists materials with large spin splitting, and outlines design strategies for experimental realization.
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