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arxiv: 2604.26149 · v1 · submitted 2026-04-28 · ❄️ cond-mat.mtrl-sci · cond-mat.mes-hall

First-Principles Study of Structural, Electronic, Thermal, and Optical Properties of Quasi-2D C2 N2 O Using GGA and HSE06

Hemn. G. H , Nzar. R. Abdullah , Vidar Gudmundsson This is my paper

Pith reviewed 2026-05-07 15:36 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci cond-mat.mes-hall
keywords quasi-2D C2N2Odensity functional theoryindirect band gapoptical absorptionlattice thermal conductivityphonon scatteringsemiconductor
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The pith

Quasi-2D C2N2O is a stable semiconductor with strong visible and UV absorption plus exceptionally low room-temperature thermal conductivity.

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

The paper applies density functional theory and ab initio molecular dynamics to a proposed quasi-two-dimensional arrangement of carbon, nitrogen, and oxygen atoms. It reports that the structure holds together energetically and thermally at ambient conditions, behaves as an indirect semiconductor, absorbs light effectively across visible and ultraviolet wavelengths, and conducts heat at only 0.017 W per meter per kelvin at 300 K. These traits arise from p-orbital hybridization, significant phonon scattering, and near-complete vibrational mode excitation. A reader would care because the combination points to possible use in small devices that must handle both light and heat flow without external cooling.

Core claim

The quasi-2D C2N2O structure maintains thermal and energetic stability with reduced dynamical stability. It functions as an indirect semiconductor whose band gap is 2.3 eV under GGA and 3.9 eV under HSE06 because of p-orbital hybridization among N, C, and O. Optical response shows strong absorption in the visible and ultraviolet ranges, in-plane versus out-of-plane anisotropy, and plasmon resonance near 3.8 eV. At 300 K the heat capacity reaches approximately 382 J per mole per kelvin, close to the Dulong-Petit limit, while lattice thermal conductivity drops to 0.017 W per meter per kelvin due to a phonon scattering rate of roughly 3.2 per picosecond.

What carries the argument

The quasi-2D C2N2O atomic lattice whose electronic, optical, and phonon properties are computed with GGA and HSE06 density functional theory.

If this is right

  • The moderate band gap and visible-UV absorption enable nanoscale optoelectronic components that respond to visible light.
  • The extremely low lattice thermal conductivity supports thermal insulation or management layers in nano-scale devices.
  • Optical anisotropy between in-plane and out-of-plane directions allows polarization-selective light handling.
  • Near-complete heat-capacity saturation at 300 K indicates reliable thermal behavior without additional vibrational degrees of freedom at room temperature.
  • Plasmon resonance at 3.8 eV suggests possible surface-plasmon applications in the ultraviolet range.

Where Pith is reading between the lines

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

  • If the material can be grown, its low thermal conductivity might combine with modest electrical conductivity to yield useful thermoelectric figures of merit.
  • Strain or chemical substitution could shift the indirect gap and absorption edge, offering routes to tailor the material for specific wavelengths.
  • Comparison with other carbon-nitride 2D sheets would test whether the added oxygen atom is responsible for the unusually strong phonon scattering.

Load-bearing premise

The structure remains stable enough for real-world use even though dynamical stability is lower, and the GGA and HSE06 approximations accurately describe its actual electronic and phonon behavior.

What would settle it

An experiment that synthesizes the material and measures a band gap far from 3.9 eV or a thermal conductivity much higher than 0.017 W per meter per kelvin at room temperature would show the calculations do not match reality.

Figures

Figures reproduced from arXiv: 2604.26149 by Hemn. G. H, Nzar. R. Abdullah, Vidar Gudmundsson.

Figure 1
Figure 1. Figure 1: Crystal structure of quasi-2D C2N2O in (a) top view and (b) side view. Carbon, nitrogen, and oxygen atoms are colored yel￾low, blue, and red, respectively. 3.2. Stability In this section, we use several methods to assess the stability of the quasi-2D C2N2O structure. To evaluate the energetic stability, the formation energy as a function of the lattice constant is calculated. Next, the phonon band structur… view at source ↗
Figure 2
Figure 2. Figure 2: Formation energy of quasi-2D C2N2O as a function of lattice constant (a, b, and c). As shown in view at source ↗
Figure 3
Figure 3. Figure 3: AIMD simulation of quasi-2D C2N2O structure. The phonon band structure of the quasi-2D C2N2O structure is determined by using the PHONOPY software inside the DFT framework in order to examine its dynami￾cal stability view at source ↗
Figure 5
Figure 5. Figure 5: Electron band structure of quasi-2D C2N2O using GGA (a) and HSE06 (b) functional, where the Fermi energy is set to zero. Additional information on electronic characteristics is provided by the PDOS study, as seen in view at source ↗
Figure 7
Figure 7. Figure 7: Im(ε) (red) and Re(ε) (blue) in the case of Ek (a) and E⊥ (b) view at source ↗
Figure 6
Figure 6. Figure 6: Partial density of states of quasi-2D C2N2O. 3.4. Optical properties The optical characteristics of the C2N2O structure are discussed in this section in order to have a better under￾standing of how it interacts with electromagnetic radia￾tion. Together with the real part (Re(ε)) and imaginary part (Im(ε)), the complex dielectric function describes the material’s optical response. Information on inter-band … view at source ↗
Figure 8
Figure 8. Figure 8: Optical conductivity (a) and refractive index (b) view at source ↗
Figure 9
Figure 9. Figure 9: shows how the quasi-2D C2N2O structure’s heat capacity changes with temperature between 0 and 1000 K. The material’s ability to absorb and store thermal energy, which is mainly controlled by lattice vibrations, is reflected in its heat capacity. At low temperatures, the heat capacity escalates significantly with increasing temperature due to the gradual activation of low-energy phonon modes. This fast incr… view at source ↗
Figure 11
Figure 11. Figure 11: Phonon group velocity as a function of frequency fo view at source ↗
Figure 12
Figure 12. Figure 12: Phonon scattering rate of quasi-2D C2N2O as a function of frequency. 4. Conclusions In summary, first-principles calculations using DFT have been performed to investigate the structural, elec￾tronic, thermal, and optical properties of the quasi-2D C2N2O structure. The optimized geometry verifies that the structure is stable both energetically and thermally. The electronic band structure indicates a semico… view at source ↗
read the original abstract

DFT and AIMD are used to investigate the structural, stability, electronic, thermal, and optical properties of the quasi-2D C2N2O structure. The structure exhibits thermal and energy stability, signifying robustness under ambient conditions, however less dynamical stability is observed. The electronic structure investigation reveals that C2N2O displays semiconducting properties with a moderate indirect band gap resulting from the hybridisation of p-orbitals of N, C, and O atoms, with band gap values of 2.3 eV (GGA) and 3.9 eV (HSE06). The optical properties, including the dielectric function, optical conductivity, and refractive index, are thoroughly analyzed to clarify the electronic transitions. The material exhibits considerable optical absorption in the visible and ultraviolet spectrum, with notable anisotropy between in-plane and out-of-plane polarizations. Furthermore, plasmon resonance occurs at around 3.8 eV, relating to the collective oscillations of charge carriers. The thermal properties indicate a heat capacity of around 382 J/mol.K at 300 K, which is close to and slightly above the standard Dulong-Petit limit for this structure, indicating near-complete excitation of lattice vibrational modes at room temperature. The lattice thermal conductivity is extremely low, reaching approximately 0.017 W/m.K at 300 K, primarily attributed to significant phonon scattering, evidenced by a scattering rate of roughly 3.2 1/ps in the phonon frequency ranges. The findings demonstrate that the C2N2O structure maintains structural stability while allowing for tunable electronic, optical, and thermal properties, making it a promising candidate for nanoscale optoelectronic and thermal control 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

2 major / 2 minor

Summary. The manuscript presents a first-principles DFT investigation (GGA and HSE06) combined with AIMD of the quasi-2D C2N2O structure. It reports energetic and thermal stability from AIMD, lower dynamical stability from phonons, an indirect semiconducting gap of 2.3 eV (GGA) and 3.9 eV (HSE06) arising from p-orbital hybridization, anisotropic optical absorption in the visible/UV with plasmon resonance near 3.8 eV, and very low lattice thermal conductivity (~0.017 W/m.K at 300 K) due to high phonon scattering rates (~3.2 ps^{-1}). The work concludes that the material maintains structural stability while offering tunable properties suitable for nanoscale optoelectronic and thermal-control applications.

Significance. If the phonon spectrum and low thermal conductivity results hold after proper convergence, the study adds a computational characterization of a novel C2N2O quasi-2D system to the 2D-materials literature, highlighting HSE06 corrections to the gap and the potential for strong phonon scattering. The dual-functional approach and AIMD thermal-stability check are standard strengths, but the tension between reported lower dynamical stability and the application-oriented claims reduces the immediate impact until the phonon data are quantified.

major comments (2)
  1. [Abstract] Abstract: The central claim that C2N2O 'maintains structural stability' and is 'promising' for applications is undercut by the explicit statement of 'less dynamical stability is observed.' The phonon-dispersion results (presumably in the stability or phonon section) must report the magnitude of any imaginary frequencies, the supercell size, and k-point sampling used; without these, it is impossible to judge whether soft modes preclude ambient-temperature robustness or require additional stabilization.
  2. [Methods/Results] Methods and Results sections: The abstract and available text provide no convergence tests, plane-wave cutoff, k-mesh density, or force/pressure tolerances for the GGA/HSE06 and phonon calculations. These parameters are load-bearing for the reported band gaps, optical spectra, and especially the low thermal-conductivity value; their absence prevents assessment of numerical reliability.
minor comments (2)
  1. [Abstract] Abstract: The heat-capacity value (382 J/mol.K) is stated to be 'close to and slightly above' the Dulong-Petit limit; the exact classical limit for this stoichiometry should be calculated and stated for direct comparison.
  2. [Optical properties] The optical-properties discussion would benefit from explicit comparison of the HSE06-corrected dielectric function or absorption edge to the GGA result to quantify the improvement.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback on our manuscript. We address the major comments point by point below, agreeing that additional details on phonon stability and computational parameters will improve clarity and reproducibility. We will revise the manuscript accordingly.

read point-by-point responses

  1. Referee: [Abstract] The central claim that C2N2O 'maintains structural stability' and is 'promising' for applications is undercut by the explicit statement of 'less dynamical stability is observed.' The phonon-dispersion results must report the magnitude of any imaginary frequencies, the supercell size, and k-point sampling used; without these, it is impossible to judge whether soft modes preclude ambient-temperature robustness or require additional stabilization.

    Authors: We agree that the abstract phrasing creates an apparent tension that requires clarification. The term 'structural stability' refers specifically to the energetic stability (negative formation energy) and thermal stability demonstrated by AIMD simulations, which show no structural degradation or bond breaking at 300 K over the simulation timescale. The 'less dynamical stability' refers to the phonon dispersion, where small imaginary frequencies are present. In the revised manuscript we will (i) explicitly report the magnitude of the imaginary frequencies, (ii) state the supercell size and k-point sampling used for the phonon calculations, and (iii) revise the abstract to note that the material exhibits good thermal stability but marginal dynamical stability, which may necessitate substrate or strain engineering for practical use. These additions will allow readers to assess robustness directly. revision: yes

  2. Referee: [Methods/Results] The abstract and available text provide no convergence tests, plane-wave cutoff, k-mesh density, or force/pressure tolerances for the GGA/HSE06 and phonon calculations. These parameters are load-bearing for the reported band gaps, optical spectra, and especially the low thermal-conductivity value; their absence prevents assessment of numerical reliability.

    Authors: We acknowledge that the absence of these parameters limits independent verification. In the revised Methods section we will add a dedicated paragraph specifying the plane-wave cutoff energy, k-point meshes for electronic, optical, and phonon calculations, force and pressure convergence criteria, and the supercell sizes employed. We will also include a short convergence test subsection demonstrating that the HSE06 band gap and lattice thermal conductivity are converged to within a few percent with respect to these settings. This will directly support the reliability of the reported 0.017 W/m·K value at 300 K. revision: yes

Circularity Check

0 steps flagged

No significant circularity; all quantities are direct DFT outputs

full rationale

The paper applies standard, externally validated DFT methods (GGA and HSE06 functionals, AIMD, phonon calculations) to a fixed input atomic structure. Every reported value—band gaps, dielectric functions, heat capacity, lattice thermal conductivity—is a direct numerical output of the chosen codes and approximations with no parameter fitting to the target observables, no self-definitional loops, and no load-bearing self-citations that substitute for independent verification. The derivation chain is therefore self-contained and non-circular.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The study rests on the standard validity of DFT for this class of materials and the assumption that the chosen exchange-correlation functionals are adequate.

axioms (1)
  • domain assumption Density functional theory with the chosen GGA and HSE06 functionals yields sufficiently accurate structural, electronic, and vibrational properties for this system.
    Invoked throughout the abstract as the basis for all reported numbers.

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