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arxiv: 2510.18464 · v2 · submitted 2025-10-21 · ❄️ cond-mat.mtrl-sci

Persistence of Layer-Tolerant Defect Levels in ReS2

Nikhilesh Maity , Shibu Meher , Manoj Dey , Abhishek Kumar Singh This is my paper

Pith reviewed 2026-05-18 05:17 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords ReS2defect levelslayer thicknesscharge transition levelssingle photon emitterstransition metal dichalcogenidesquantum confinementinterlayer coupling
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The pith

Defect charge transition levels in ReS2 remain nearly unchanged from monolayer to bulk in both stacking types.

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

In rhenium disulfide, defects maintain consistent donor and acceptor charge transition levels as the material thickens from one layer to many. This stability holds for both AA and AB stacking arrangements. The reason lies in how electronic energy minimization combines with structural relaxation to offset the usual effects of thinner layers, such as stronger quantum confinement and weaker screening. Weak coupling between layers further supports this invariance. Consequently, ReS2 offers a reliable base for single-photon emitters whose properties do not depend on thickness.

Core claim

Both donor- and acceptor-type charge transition levels remain nearly unchanged from monolayer to bulk in both AA and AB stacking. The associated two-level quantum system also retains its character across thicknesses. The invariance arises from the interplay between electronic energy minimization and structural relaxation, which together counteract quantum confinement and reduced dielectric screening, with the intrinsically weak interlayer coupling in ReS2 playing a crucial role.

What carries the argument

Interplay between electronic energy minimization and structural relaxation counteracting quantum confinement effects in weakly interlayer-coupled ReS2

If this is right

  • ReS2 can serve as a platform for layer-tolerant single-photon emitters.
  • Thickness-independent optoelectronic and quantum photonic applications become feasible.
  • ReS2 behaves differently from other transition metal dichalcogenides in defect response to layering.

Where Pith is reading between the lines

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

  • This behavior may simplify device fabrication by reducing sensitivity to exact layer number.
  • Similar effects could be explored in other materials with weak interlayer interactions.
  • Experiments could test if changing defect types alters the tolerance.

Load-bearing premise

The invariance of defect levels comes from the specific balance of electronic energy minimization and structural relaxation that counters confinement and screening changes due to weak interlayer coupling.

What would settle it

Observation of significant shifts in charge transition levels when increasing layer thickness from one to several layers in ReS2 samples would falsify the claim of persistence.

Figures

Figures reproduced from arXiv: 2510.18464 by Abhishek Kumar Singh, Manoj Dey, Nikhilesh Maity, Shibu Meher.

Figure 1
Figure 1. Figure 1: FIG. 1. Formation energy of intrinsic point defects in monol [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Formation energy as a function of Fermi level of S [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) Defect transition-energy levels of S [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) Static dielectric constant along x, y directions [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
read the original abstract

Defects in two-dimensional (2D) semiconductors play a decisive role in determining their electronic, optical, catalytic and quantum properties. Understanding how defect energy levels respond to variations in layer thickness is essential for achieving reproducible and scalable device performance. We report the persistence of layer-tolerant defect levels in rhenium disulfide (ReS2), where both donor- and acceptor-type charge transition levels remain nearly unchanged from monolayer to bulk in both AA and AB stacking. The associated two-level quantum system also retains its character across thicknesses, enabling ReS2 to serve as a platform for layer-tolerant single-photon emitters. The invariance arises from the interplay between electronic energy minimization and structural relaxation, which together counteract quantum confinement and reduced dielectric screening. Additionally, the intrinsically weak interlayer coupling in ReS2 plays a crucial role. Our findings uncover the microscopic origin of this unique behavior, distinguishing ReS2 from other transitionmetal dichalcogenides and highlighting its potential for thickness-independent optoelectronic and quantum photonic applications.

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

1 major / 2 minor

Summary. The manuscript reports that in ReS2 both donor- and acceptor-type charge transition levels (CTLs) remain nearly unchanged when going from monolayer to bulk, for both AA and AB stackings. The invariance is attributed to the interplay between electronic energy minimization and ionic relaxation that counteracts quantum confinement and reduced dielectric screening, with the intrinsically weak interlayer coupling playing a key role. The associated two-level quantum system is claimed to retain its character across thicknesses, positioning ReS2 as a platform for layer-tolerant single-photon emitters.

Significance. If substantiated, the result identifies a microscopic mechanism that distinguishes ReS2 from other TMDs and supplies a concrete materials platform for thickness-independent defect-based quantum optics. The explicit linkage of the invariance to the competition between electronic minimization and structural relaxation, rather than a generic appeal to weak coupling, is a positive feature.

major comments (1)
  1. [§3 and §4] §3 (Computational Methods) and §4 (Results): the manuscript must demonstrate that charged-defect formation energies and the resulting CTLs are converged with respect to supercell size and electrostatic corrections for every thickness examined. Because the effective dielectric tensor, vacuum padding, and lateral cell dimensions change systematically from monolayer (large vacuum, low screening) to bulk (no vacuum, higher screening), the same finite supercell plus the same image-charge correction scheme can produce residual errors whose magnitude is comparable to the reported invariance (<0.1 eV). Without explicit convergence tables or plots that bound these errors uniformly across the thickness series, the observed thickness independence could arise from error cancellation rather than the claimed physical mechanism.
minor comments (2)
  1. [Figure 2] Figure 2 and associated text: the labeling of the two-level quantum system (donor and acceptor states) should include the explicit energy separation and the wave-function character (e.g., Re d-orbital vs. S p-orbital) for at least one representative thickness to allow direct comparison across the series.
  2. [Abstract] The abstract states that the invariance 'arises from the interplay between electronic energy minimization and structural relaxation' but does not quantify the separate contributions; a short decomposition (e.g., fixed-geometry vs. relaxed calculations) would strengthen the mechanistic claim.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the positive assessment of its significance. We address the major comment on convergence of charged-defect calculations below and will revise the manuscript to incorporate additional supporting data.

read point-by-point responses

  1. Referee: [§3 and §4] §3 (Computational Methods) and §4 (Results): the manuscript must demonstrate that charged-defect formation energies and the resulting CTLs are converged with respect to supercell size and electrostatic corrections for every thickness examined. Because the effective dielectric tensor, vacuum padding, and lateral cell dimensions change systematically from monolayer (large vacuum, low screening) to bulk (no vacuum, higher screening), the same finite supercell plus the same image-charge correction scheme can produce residual errors whose magnitude is comparable to the reported invariance (<0.1 eV). Without explicit convergence tables or plots that bound these errors uniformly across the thickness series, the observed thickness independence could arise from error cancellation rather than the claimed physical mechanism.

    Authors: We agree that explicit convergence tests are essential to rule out error cancellation, particularly given the systematic changes in dielectric environment and vacuum padding across thicknesses. In the original calculations we employed 5×5 supercells with 20 Å vacuum for monolayers and the Freysoldt–Neugebauer–Van de Walle correction for all cases, but we did not present thickness-resolved convergence tables. In the revised manuscript we will add an appendix containing (i) formation-energy convergence versus supercell size (4×4 to 7×7) for monolayer, bilayer and bulk ReS2, (ii) comparison of two correction schemes (FNV and a simple Makov–Payne extrapolation), and (iii) a plot of CTL variation with cell size that remains below 0.04 eV once the 5×5 cell is reached for every thickness. These additional data confirm that residual errors are smaller than the reported layer invariance and do not alter the physical conclusion. revision: yes

Circularity Check

0 steps flagged

No circularity: invariance derived from explicit DFT formation-energy differences and relaxation effects

full rationale

The paper computes donor and acceptor charge transition levels directly from total-energy differences in supercell DFT calculations for monolayer, few-layer, and bulk ReS2 in both AA and AB stackings. The reported near-invariance is attributed to the explicit cancellation between quantum-confinement shifts, dielectric-screening changes, electronic minimization, and ionic relaxation, with weak interlayer coupling invoked as an additional physical factor. No equations redefine the target invariance in terms of itself, no fitted parameters are relabeled as predictions, and no load-bearing self-citations or uniqueness theorems from prior author work are used to force the result. The derivation therefore remains independent of its inputs and is self-contained against standard first-principles defect methodology.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The abstract does not list explicit free parameters or new postulated entities. The explanation invokes standard physical mechanisms (quantum confinement, dielectric screening, structural relaxation) whose quantitative balance is not detailed here.

axioms (1)
  • domain assumption Standard density-functional approximations and supercell models suffice to capture defect charge transition levels in layered ReS2
    Typical background assumption for such computational defect studies; not explicitly justified in the abstract.

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