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arxiv: 2509.09109 · v2 · submitted 2025-09-11 · ❄️ cond-mat.supr-con · cond-mat.mes-hall· cond-mat.mtrl-sci

Three-dimensional flat bands and possible interlayer triplet pairing superconductivity in the alternating twisted NbSe₂ moir\'e bulk

Pith reviewed 2026-05-18 18:24 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mes-hallcond-mat.mtrl-sci
keywords flat bandsmoiré bulkNbSe2twisted bilayerstructural relaxationthree-dimensional bandstriplet pairingsuperconductivity
0
0 comments X p. Extension

The pith

Alternating twisted NbSe2 moiré bulks relax spontaneously into structures with three-dimensional flat bands at twist angles up to 7.31 degrees.

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

The paper uses first-principles calculations to examine alternating twisted NbSe2 moiré bulk structures, which have stronger interlayer interactions than bilayers. It finds that these bulks relax on a large scale without external forcing, producing remarkably flat energy bands when the twist angle is 7.31 degrees or smaller. The flat bands vary with the out-of-plane momentum kz, showing they are three-dimensional rather than confined to layers. Out-of-plane mirror symmetry in the relaxed structures opens a route to interlayer triplet superconducting pairing that would not occur the same way in twisted bilayers. The work indicates that similar three-dimensional flat bands may appear in other moiré bulk systems.

Core claim

Through first-principles calculations, alternating twisted NbSe2 moiré bulks undergo spontaneous large-scale structural relaxation, resulting in the formation of remarkably flat energy bands at twist angles ≤ 7.31°. The kz-dependent dispersion of these flat bands across different moiré bulks reveals their intrinsic three-dimensional character. The presence of out-of-plane mirror symmetry in these moiré bulk structures suggests possible interlayer triplet superconducting pairing mechanisms that differ from those in twisted bilayer systems.

What carries the argument

Spontaneous large-scale structural relaxation in alternating twisted NbSe2 moiré bulks, which flattens the bands while preserving out-of-plane mirror symmetry and producing kz-dependent dispersion.

Load-bearing premise

The first-principles calculations accurately capture the spontaneous large-scale structural relaxation and resulting electronic band structure of the alternating twisted NbSe2 system without significant errors from the exchange-correlation functional or other approximations.

What would settle it

Direct experimental measurement of atomic positions or band dispersion in alternating twisted NbSe2 at a twist angle near 7 degrees that shows no large-scale relaxation or no flattening of bands would disprove the central claim.

Figures

Figures reproduced from arXiv: 2509.09109 by Peng Chen, Shihao Zhang, Shuang Liu.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) The top view of monolayer NbSe [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. The atomic displacements in the top layer (a) and bottom layer (b) in the unitcell of alternating 13 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. The energy bands of alternating twisted NbSe [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (a) The average bandwidths of energy bands high [PITH_FULL_IMAGE:figures/full_fig_p005_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: (a-b). We consider the pairing matrices of interlayer triplet channel γy0 = τy and γyz = τysz. The pairing suscepti￾bility with q-finite-momentum pairing is described as χij,µν(q) = Z p X a,b O jν a,b(p, q)O iµ∗ a,b (p, q)Kab(p, q) (5) The momenta of electron and hole in the Cooper pair are p and −p, respectively. The overlap function is defined as O jν a,b(p, q) = ⟨uap+q/2|γjν|vb−p+q/2⟩ where a and b are … view at source ↗
read the original abstract

Moir\'e superlattices hosting flat bands and correlated states have emerged as a focal topic in condensed matter research. Through first-principles calculations, we investigate three-dimensional flat bands in alternating twisted NbSe$_2$ moir\'e bulk structures. These structures exhibit enhanced interlayer interactions compared to twisted bilayer configurations. Our results demonstrate that moir\'e bulks undergo spontaneous large-scale structural relaxation, resulting in the formation of remarkably flat energy bands at twist angles $\leq$ 7.31{\deg}. The $k_z$-dependent dispersion of flat bands across different moir\'e bulks reveals their intrinsic three-dimensional character. The presence of out-of-plane mirror symmetry in these moir\'e bulk structures suggests possible interlayer triplet superconducting pairing mechanisms that differ from those in twisted bilayer systems. Our work paves the way for exploring potential three-dimensional flat bands in other moir\'e bulk systems.

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

2 major / 2 minor

Summary. The manuscript reports first-principles calculations on alternating-twisted NbSe₂ moiré bulk structures. It claims that these systems undergo spontaneous large-scale structural relaxation, producing remarkably flat bands for twist angles ≤ 7.31°. The k_z dispersion of the flat bands is presented as evidence of intrinsic three-dimensional character, while the out-of-plane mirror symmetry is invoked to suggest possible interlayer triplet superconducting pairing distinct from bilayer cases.

Significance. If the reported relaxations and flat bands are robust, the work would extend moiré flat-band physics from 2D to 3D bulk geometries and motivate searches for three-dimensional correlated states and unconventional superconductivity in other layered van der Waals materials. The emphasis on enhanced interlayer interactions in the bulk setting is a potentially useful conceptual step.

major comments (2)
  1. [§2 (Computational Methods)] §2 (Computational Methods): No information is supplied on the exchange-correlation functional, the van der Waals dispersion correction (if any), plane-wave cutoff, k-point sampling, or convergence thresholds used for structural optimization. Because the headline result attributes flat-band formation to spontaneous large-scale relaxation driven by interlayer forces, the absence of these details prevents assessment of whether the reported relaxation pattern and k_z dispersion are physical or artifacts of an inadequate treatment of vdW binding in NbSe₂.
  2. [§3 (Electronic Structure Results)] §3 (Electronic Structure Results): The manuscript states that flat bands appear at twist angles ≤ 7.31° but does not report quantitative bandwidths, compare relaxed versus unrelaxed geometries at the same angle, or show how the flatness scales with angle. Without these data it is impossible to confirm that the flatness is caused by the relaxation rather than by the bare moiré potential.
minor comments (2)
  1. [Abstract] The abstract refers to 'first-principles calculations' without any numerical values, error bars, or functional choices; adding a brief quantitative statement would improve clarity.
  2. [Figure captions] Figure captions and axis labels for band-structure plots should explicitly state the twist angle and whether the structure is relaxed or rigid.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of our manuscript and for the constructive comments, which have helped us improve the clarity and completeness of the work. We address each major comment below and have revised the manuscript accordingly to incorporate the requested details and quantitative analyses.

read point-by-point responses
  1. Referee: [§2 (Computational Methods)] §2 (Computational Methods): No information is supplied on the exchange-correlation functional, the van der Waals dispersion correction (if any), plane-wave cutoff, k-point sampling, or convergence thresholds used for structural optimization. Because the headline result attributes flat-band formation to spontaneous large-scale relaxation driven by interlayer forces, the absence of these details prevents assessment of whether the reported relaxation pattern and k_z dispersion are physical or artifacts of an inadequate treatment of vdW binding in NbSe₂.

    Authors: We agree that these computational parameters are essential for assessing the robustness of the reported relaxations. In the revised manuscript we have expanded the Computational Methods section to specify that all calculations were performed with the PBE exchange-correlation functional together with the DFT-D3 van der Waals correction (Becke-Johnson damping), a plane-wave cutoff of 500 eV, Γ-centered k-point meshes with a density of 0.025 Å⁻¹ for relaxations (denser meshes for band-structure calculations), and convergence thresholds of 10⁻⁵ eV for energy and 0.01 eV/Å for forces. Additional convergence tests with respect to cutoff and k-point density have been added to confirm that the large-scale relaxation pattern and the resulting k_z dispersion remain unchanged, indicating that the flat bands are not an artifact of the vdW treatment. revision: yes

  2. Referee: [§3 (Electronic Structure Results)] §3 (Electronic Structure Results): The manuscript states that flat bands appear at twist angles ≤ 7.31° but does not report quantitative bandwidths, compare relaxed versus unrelaxed geometries at the same angle, or show how the flatness scales with angle. Without these data it is impossible to confirm that the flatness is caused by the relaxation rather than by the bare moiré potential.

    Authors: We acknowledge that explicit quantitative measures strengthen the attribution of flatness to relaxation. The revised manuscript now includes a table listing the bandwidths of the flat bands for each studied twist angle. We have added a direct comparison of the electronic band structures obtained from relaxed and unrelaxed geometries at the 7.31° angle, which shows that relaxation reduces the bandwidth by more than an order of magnitude relative to the bare moiré potential. Finally, we have inserted a supplementary figure plotting bandwidth versus twist angle that demonstrates the systematic flattening below 7.31° and its correlation with the onset of large-scale structural relaxation. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation rests on independent first-principles DFT

full rationale

The paper's central claims—that alternating-twisted NbSe2 moiré bulks undergo spontaneous large-scale structural relaxation producing flat bands at twist angles ≤7.31° and exhibit 3D character with possible interlayer triplet pairing—are obtained directly from first-principles calculations of relaxation and electronic structure. No equations, parameters, or results are defined in terms of the target flat-band or pairing outcomes; the structural optimization and band dispersions are computed outputs rather than inputs. No self-citations are invoked as load-bearing uniqueness theorems, and the method (standard DFT with structural relaxation) is externally falsifiable against other functionals or experiments. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the assumption that standard density-functional-theory methods reliably predict structural relaxation and band flattening in this moiré system; no free parameters or new entities are introduced in the abstract.

axioms (1)
  • domain assumption Density functional theory approximations are adequate to describe interlayer interactions and structural relaxation in twisted NbSe2.
    The study is based entirely on first-principles calculations whose accuracy depends on this standard assumption.

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