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arxiv: 2605.18501 · v1 · pith:MKWPLVAOnew · submitted 2026-05-18 · 🪐 quant-ph · cond-mat.mtrl-sci· physics.optics

Quantum Emitters at Telecommunication Wavelengths based on Carbon Defects in Transition Metal Dichalcogenides

Chanaprom Cholsuk , Sujin Suwanna , Tobias Vogl This is my paper

Pith reviewed 2026-05-20 10:42 UTC · model grok-4.3

classification 🪐 quant-ph cond-mat.mtrl-sciphysics.optics
keywords carbon defectstransition metal dichalcogenidesquantum emitterstelecommunication wavelengthsdensity functional theoryroom temperaturebilayersdefect emission
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The pith

Carbon defects in TMD bilayers create room-temperature quantum emitters at telecommunication wavelengths.

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

The paper proposes that moving to TMD bilayers with their indirect bandgap, combined with carbon point defects, overcomes the room-temperature photoluminescence quenching seen in monolayers. Hybrid-functional density functional theory calculations show that substitutional carbon at chalcogen sites forms stable neutral and negative defects with emission in the O- and C-bands or near-infrared. Neutral defects give singlet emission while charged ones give spin-selective transitions. This combination would matter because it points toward practical, fiber-compatible quantum emitters that function without cryogenic cooling.

Core claim

Using hybrid-functional density functional theory, the authors find that substitutional carbon defects at chalcogen sites in WS2, WSe2, MoS2, and MoSe2 bilayers are thermodynamically stable in both neutral and singly negative charge states. Neutral defects adopt singlet configurations and emit in the O- and C-band telecommunication windows, whereas negatively charged defects adopt doublet configurations with spin-selective transitions and near-infrared emission. The indirect bandgap of the bilayers suppresses excitonic photoluminescence, allowing defect-mediated emission to dominate.

What carries the argument

Substitutional carbon defects at chalcogen sites in TMD bilayers, whose emission energies, electron-phonon coupling strengths, radiative lifetimes, and dipole orientations are computed with hybrid density functional theory.

Load-bearing premise

The indirect bandgap in TMD bilayers will suppress excitonic photoluminescence quenching enough for defect-mediated emission to dominate at room temperature.

What would settle it

Room-temperature photoluminescence measurements on carbon-doped TMD bilayer samples that show clear defect peaks in the O or C bands while excitonic emission remains strongly suppressed.

Figures

Figures reproduced from arXiv: 2605.18501 by Chanaprom Cholsuk, Sujin Suwanna, Tobias Vogl.

Figure 1
Figure 1. Figure 1: Geometries and charge stabilities. a The 7×7×1 supercell structures where the carbon is doped on top or middle layers. b - e Defect formation energies of WS2, WSe2, MoS2, and MoSe2, respectively, under chalcogen-rich and chalcogen-poor conditions as a function of Fermi level. Finite-size charge corrections were taken into account. The Fermi level represents the chemical potential, which varies across the b… view at source ↗
Figure 2
Figure 2. Figure 2: Kohn–Sham electronic transitions at the Γ point for carbon substitution in the top layer. a and b for WS2 doped with CS and C−1 S . c and d for WSe2 doped with CSe and C−1 Se . e and f for MoS2 doped with CS and C−1 S . g and h for MoSe2 doped with CSe and C−1 Se . The green arrows represent the electronic transition responsible for the computed ZPLs. Note that the electronic transitions for the doping at … view at source ↗
Figure 3
Figure 3. Figure 3: Simulated photoluminescense spectra. a and b for WS2 doped with CS and C−1 S . c and d for WSe2 doped with CSe and C−1 Se . e and f for MoS2 doped with CS and C−1 S . g and h for MoSe2 doped with CSe and C−1 Se . The green and pink shaded regions indicate the telecommunication wavelength ranges for the O-band (1260-1360 nm) and C-band (1530-1565 nm), respectively. them prone to thermal activation. In contr… view at source ↗
read the original abstract

Low-dimensional materials have emerged as promising hosts for quantum emitters, whose emission typically arises from either strain-induced band bending or defect-induced two-level systems. Among these materials, transition metal dichalcogenide (TMD) monolayers have attracted particular attention; however, their performance is limited by strong photoluminescence (PL) quenching at room temperature. As TMDs transition from a direct to an indirect bandgap when moving from monolayers to multilayers, we herein propose a strategy to overcome this quenching limitation by exploiting the indirect bandgap of TMD bilayers in combination with a point defect doping. The indirect gap suppresses excitonic PL, while specific defects enable robust defect-mediated quantum emission. Using hybrid-functional density functional theory, we investigate substitutional carbon defects at chalcogen sites (S and Se) in WS2, WSe2, MoS2, and MoSe2 bilayers and comprehensively characterize their optical properties. Both neutral and singly negative charge states are found to be thermodynamically stable. Neutral defects exhibit singlet configurations with emission in the O- and C-band telecommunication windows, whereas negatively charged defects adopt doublet configurations featuring spin-selective transitions and near-infrared emission. The electron-phonon coupling strength, radiative lifetime, and dipole orientation are found to depend sensitively on both the host material and defect site, providing distinct fingerprints for experimental identification. Our findings, therefore, establish carbon-doped TMD bilayers as promising platforms for room-temperature defect-based quantum emitters operating at telecommunication wavelengths.

Editorial analysis

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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 / 1 minor

Summary. The paper proposes exploiting the indirect bandgap of TMD bilayers (WS2, WSe2, MoS2, MoSe2) combined with substitutional carbon defects at chalcogen sites to enable room-temperature quantum emitters at telecommunication wavelengths. Hybrid-functional DFT is used to compute defect formation energies, stable charge states (neutral singlet and negative doublet), telecom-range optical transition energies, electron-phonon coupling strengths, radiative lifetimes, and dipole orientations for C_S and C_Se defects. The central strategy is that the indirect gap suppresses host excitonic PL quenching while defects provide robust emission channels.

Significance. If the results hold, the work supplies a set of concrete, material-specific DFT predictions (formation energies, spin-selective transitions, and optical fingerprints) that could guide experimental searches for defect-based telecom quantum emitters in bilayer TMDs. The parameter-free hybrid-functional approach and comprehensive characterization of both neutral and charged states represent a strength, offering falsifiable targets for identification via PL spectra and lifetimes.

major comments (1)
  1. [Abstract / Proposed Strategy] Abstract and strategy discussion: the enabling assumption that the indirect bandgap 'sufficiently suppresses excitonic PL' so that defect-mediated emission dominates at room temperature is not quantitatively tested. No calculations of pristine-bilayer temperature-dependent excitonic PL intensity, indirect/direct transition competition, thermal quenching factors at 300 K, or direct rate comparison between host and defect channels are reported. This leaves the central claim of room-temperature operation without direct computational support within the presented results.
minor comments (1)
  1. [Methods] The manuscript would benefit from explicit statements of DFT convergence parameters (k-point sampling, plane-wave cutoff, supercell size) and any error estimates on the reported transition energies and lifetimes.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed and constructive report. The single major comment raises an important point about the quantitative support for room-temperature operation. We address it below and have prepared a partial revision that clarifies the basis of our central claim without overstating the computational results.

read point-by-point responses

  1. Referee: Abstract and strategy discussion: the enabling assumption that the indirect bandgap 'sufficiently suppresses excitonic PL' so that defect-mediated emission dominates at room temperature is not quantitatively tested. No calculations of pristine-bilayer temperature-dependent excitonic PL intensity, indirect/direct transition competition, thermal quenching factors at 300 K, or direct rate comparison between host and defect channels are reported. This leaves the central claim of room-temperature operation without direct computational support within the presented results.

    Authors: We agree that the manuscript does not contain explicit calculations of temperature-dependent excitonic PL quenching or direct rate comparisons between host and defect channels. The central strategy rests on the well-documented experimental observation that TMD bilayers exhibit strong suppression of excitonic photoluminescence at room temperature due to the indirect bandgap, as reported in multiple studies on WS2, WSe2, MoS2, and MoSe2 bilayers. Our work instead provides a comprehensive hybrid-DFT characterization of the carbon defects themselves, including formation energies, charge-state stability, optical transition energies in the telecom range, electron-phonon coupling, radiative lifetimes, and dipole orientations. To address the referee's concern, we will revise the abstract and add a concise paragraph in the introduction that explicitly cites key experimental literature on PL quenching in TMD bilayers and states that the room-temperature defect emission is proposed on the basis of these established host properties combined with the computed defect characteristics. We will also tone down the abstract wording to present the room-temperature operation as a proposed strategy rather than a fully computationally demonstrated result. revision: partial

Circularity Check

0 steps flagged

No circularity: independent hybrid-DFT defect calculations

full rationale

The paper computes defect formation energies, stable charge states, transition energies, electron-phonon coupling, radiative lifetimes, and dipole orientations for C_S and C_Se defects in TMD bilayers using standard hybrid-functional DFT. These quantities are obtained directly from first-principles electronic-structure methods without parameter fitting to experimental spectra or to the target room-temperature emission claim. The indirect-bandgap suppression strategy is stated as a known material property of bilayers and is not derived from or fitted to the defect results. No self-definitional loops, renamed predictions, or load-bearing self-citations appear in the derivation chain. The optical-property predictions therefore remain independent of the final platform claim.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard assumptions of hybrid-functional DFT for defect formation energies and optical transitions in 2D materials; no new entities are postulated and no parameters are fitted to the target emission wavelengths.

axioms (1)
  • domain assumption Hybrid-functional DFT provides accurate descriptions of defect charge states and optical transitions in TMD bilayers
    Invoked throughout the computational characterization of neutral and negative carbon defects.

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