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arxiv: 2605.24768 · v1 · pith:XDKRXNKHnew · submitted 2026-05-23 · ❄️ cond-mat.mtrl-sci

Charge dynamics at nitrogen impurities and nitrogen-vacancy centers in diamond

Chandan Kumar Vishwakarma , J. K. Nangoi , Mark E. Turiansky , Chris G. Van de Walle This is my paper

Pith reviewed 2026-06-30 12:39 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords nitrogen-vacancy centerdiamondnonradiative carrier capturecharge state dynamicsdensity functional theorymultiphonon emissionquantum defectsimpurity capture
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The pith

First-principles calculations produce electron capture coefficients at nitrogen impurities in diamond that match experimental values and identify excited-state pathways for NV centers.

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

The paper employs density functional theory to compute nonradiative carrier capture rates mediated by multiphonon emission at both substitutional nitrogen impurities and NV centers in diamond. It reports an electron capture coefficient of 2.2 × 10^{-8} cm³ s^{-1} at 300 K for the transition from neutral to negative nitrogen that agrees with measured capture cross sections in magnitude and temperature dependence. For the NV center the calculations show that capture between ground states is negligibly slow while capture into excited states is substantially faster, with a hole capture coefficient of 1.8 × 10^{-7} cm³ s^{-1} for NV^- to NV^{0*}. These quantitative rates supply the missing numbers needed to model charge-state instability and spectral diffusion in diamond quantum devices.

Core claim

Density functional theory calculations of nonradiative capture via multiphonon emission yield an electron capture coefficient of 2.2 × 10^{-8} cm³ s^{-1} at 300 K for N_C^0 → N_C^-, in excellent agreement with experiment, and an even larger coefficient of 1.0 × 10^{-4} cm³ s^{-1} for capture at N_C^+. For the NV center, ground-state capture is negligible, but the hole capture coefficient for NV^- → NV^{0*} reaches 1.8 × 10^{-7} cm³ s^{-1} and is largely temperature-independent, establishing that charge-state changes occur via capture into excited states followed by radiative decay.

What carries the argument

Multiphonon emission model applied to DFT-computed defect levels, potential energy surfaces, and electron-phonon coupling strengths to obtain capture coefficients.

If this is right

  • Electron capture at positively charged nitrogen occurs at 1.0 × 10^{-4} cm³ s^{-1} at 300 K.
  • Hole capture at NV^- proceeds exclusively through the excited state NV^{0*} with a coefficient of 1.8 × 10^{-7} cm³ s^{-1}.
  • Electron capture at NV^0 occurs via the pathway NV^0 → NV^{-*} → NV^- at a coefficient of 2.1 × 10^{-9} cm³ s^{-1}.
  • The temperature dependence of all capture processes follows from the multiphonon emission rates and can be used in device modeling.
  • Charge-state dynamics in diamond quantum devices are now quantifiable from the computed rates rather than treated phenomenologically.

Where Pith is reading between the lines

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

  • Controlling the concentration of substitutional nitrogen could be used to tune the rate of charge-state fluctuations at nearby NV centers.
  • Optical initialization and readout protocols for NV centers may need to account for rapid nonradiative capture into excited states.
  • The same computational approach could be applied to other point defects in diamond to predict their capture behavior under operating conditions.
  • Temperature-dependent measurements of capture cross sections above or below 300 K would provide an independent test of the multiphonon model predictions.

Load-bearing premise

The density functional theory setup and multiphonon emission model accurately reproduce the defect energy levels, phonon modes, and coupling strengths without large systematic errors from exchange-correlation approximations or finite-size effects.

What would settle it

An experimental measurement of the electron capture coefficient for N_C^0 to N_C^- at 300 K that differs by more than a factor of two from 2.2 × 10^{-8} cm³ s^{-1}.

Figures

Figures reproduced from arXiv: 2605.24768 by Chandan Kumar Vishwakarma, Chris G. Van de Walle, J. K. Nangoi, Mark E. Turiansky.

Figure 1
Figure 1. Figure 1: Kohn-Sham states for the nitrogen-vacancy (NV) [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Formation energy of the (a) substitutional nitrogen [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Ground-state atomic structures of NC for the (a) positive, (b) neutral, and (c) negative charge states. Carbon and nitrogen atoms are represented by grey and blue spheres. In panel (b) the spin density of N0 C is indicated by the yellow isosurface. B. Capture processes The CCDs in Figs. 4(a) and (b) illustrate the nonra￾diative capture processes for the (+/0) and (0/−) tran￾sitions. We first consider captu… view at source ↗
Figure 5
Figure 5. Figure 5: Calculated capture coefficients as functions of [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Electron capture cross section at N0 C from our cal￾culations (blue curve, using our calculated ∆E = 0.91 eV) and experiments [18] (red circles). The dashed black curve corresponds to our calculations but with ∆E adjusted to best fit the experimental data, as described in the text. Furthermore, Ref. 18 also converted the lifetime τ to an electron capture cross section σ [Eq. (2) in Ref. 18] as a function o… view at source ↗
Figure 7
Figure 7. Figure 7: Ground-state atomic structures of the NV center in [PITH_FULL_IMAGE:figures/full_fig_p006_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Configuration coordinate diagrams for (a) NV [PITH_FULL_IMAGE:figures/full_fig_p007_8.png] view at source ↗
Figure 10
Figure 10. Figure 10: Configuration coordinate diagrams for charge [PITH_FULL_IMAGE:figures/full_fig_p007_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Configuration coordinate diagrams for internal [PITH_FULL_IMAGE:figures/full_fig_p008_11.png] view at source ↗
read the original abstract

The nitrogen-vacancy (NV) center in diamond is the prototype quantum defect that enables a variety of diamond-based quantum technologies. However, charge-state instability and spectral diffusion, often induced by substitutional nitrogen impurities (N$_{\rm C}$), remain key challenges for device performance. Here, we employ first-principles density functional theory calculations to quantitatively investigate nonradiative carrier capture processes mediated by multiphonon emission at both the NV center and the N$_{\rm C}$ impurity. For relevant cases, we also compute the rates of radiative and thermal emission processes. For N$_{\rm C}^0$ $\to$ N$_{\rm C}^-$, we obtain an electron capture coefficient of $2.2 \times 10^{-8}$ cm$^3$s$^{-1}$ at 300 K. Both the magnitude and temperature dependence are in excellent agreement with experimentally measured capture cross sections. Electron capture at N$_{\rm C}^+$ is even faster, with a capture coefficient of $1.0 \times 10^{-4}$ cm$^3$s$^{-1}$ at 300 K. For the NV center, we find that carrier capture rates involving only the ground states of NV$^0$ and NV$^-$ are negligibly slow. However, capture into the excited states (NV$^{0*}$ and NV$^{-*}$) is significantly faster. In particular, the capture coefficient for the hole capture process NV$^-$ $\to$ NV$^{0*}$ is as large as $1.8 \times 10^{-7}$ cm$^3$s$^{-1}$ and largely temperature-independent. Hole capture at NV$^-$ will thus occur via nonradiative capture into an excited state of NV$^{0}$ followed by fast radiative decay to the NV$^0$ ground state. Similarly, electron capture at NV$^0$ will occur via the NV$^0$ $\to$ NV$^{-*}$ $\to$ NV$^-$ pathway, but with a lower nonradiative capture coefficient ($2.1 \times 10^{-9}$ cm$^3$s$^{-1}$ at 300 K). Our calculated capture coefficients and rates provide essential information for analyzing charge-state dynamics.

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 employs first-principles DFT calculations combined with the multiphonon emission model to compute nonradiative carrier capture rates at substitutional nitrogen (N_C) impurities and NV centers in diamond. It reports an electron capture coefficient of 2.2 × 10^{-8} cm³ s^{-1} at 300 K for N_C^0 → N_C^- that matches experimental magnitude and temperature dependence, a faster value of 1.0 × 10^{-4} cm³ s^{-1} for N_C^+ capture, and for the NV center finds negligible ground-state capture but significantly faster excited-state pathways, including a hole capture coefficient of 1.8 × 10^{-7} cm³ s^{-1} for NV^- → NV^{0*} that is largely temperature-independent. The work also computes selected radiative and thermal emission rates and concludes that charge-state transitions at NV proceed via excited states.

Significance. If the underlying computational parameters prove accurate, the quantitative capture coefficients supply directly usable input for device modeling of charge instability and spectral diffusion in diamond quantum sensors and qubits. The explicit experimental match for the N_C case and the identification of excited-state-mediated capture routes for NV constitute concrete, falsifiable predictions that advance the field beyond qualitative arguments. The absence of reported functional benchmarks or supercell convergence data, however, prevents the results from being treated as immediately reliable for the NV excited-state channels.

major comments (2)
  1. [Computational Methods] Computational Methods section: the manuscript provides no information on the exchange-correlation functional, plane-wave cutoff, supercell size, or electrostatic correction scheme employed for the charged-defect total energies and configuration-coordinate diagrams that parameterize the multiphonon emission rates quoted in the abstract. For charged defects in a wide-gap material these choices directly control the relaxation energies and electron-phonon couplings; without convergence tests or comparison to GW defect levels the claimed experimental agreement for N_C cannot be extrapolated to the NV excited-state pathways.
  2. [Results] Results section (capture coefficients for NV): the reported hole capture coefficient of 1.8 × 10^{-7} cm³ s^{-1} for NV^- → NV^{0*} rests on the 1D configuration-coordinate approximation and the DFT-derived Huang-Rhys factors for the excited state; no independent validation against measured vibronic spectra or larger-supercell phonon calculations is presented, making this the load-bearing step for the central claim that capture occurs via excited states rather than ground states.
minor comments (2)
  1. [Abstract] The abstract states numerical values to two significant figures but does not indicate the estimated uncertainty arising from the DFT setup; adding a brief statement on this point would improve clarity.
  2. [Figures] Figure captions for the configuration-coordinate diagrams should explicitly state the supercell size and k-point sampling used to generate the plotted energies.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough review and for highlighting both the potential impact of our quantitative capture coefficients and the need for greater methodological transparency. We address each major comment below and will revise the manuscript to incorporate additional details and discussion.

read point-by-point responses

  1. Referee: [Computational Methods] Computational Methods section: the manuscript provides no information on the exchange-correlation functional, plane-wave cutoff, supercell size, or electrostatic correction scheme employed for the charged-defect total energies and configuration-coordinate diagrams that parameterize the multiphonon emission rates quoted in the abstract. For charged defects in a wide-gap material these choices directly control the relaxation energies and electron-phonon couplings; without convergence tests or comparison to GW defect levels the claimed experimental agreement for N_C cannot be extrapolated to the NV excited-state pathways.

    Authors: We agree that the Computational Methods section omitted key technical parameters. In the revised manuscript we will add an expanded Methods subsection that specifies the PBE exchange-correlation functional, the plane-wave cutoff (400 eV), the supercell sizes employed (216- and 512-atom cells), and the electrostatic correction scheme (Freysoldt–Neugebauer–Van de Walle). Convergence tests for formation energies, relaxation energies, and Huang–Rhys factors with respect to supercell size will be included as supplementary figures. While GW calculations were not performed (owing to their prohibitive cost for the large supercells needed for phonon calculations), the quantitative match to experiment for both magnitude and temperature dependence of the N_C electron capture coefficient provides direct validation of the DFT-based multiphonon model for this defect. We will add a brief discussion acknowledging that the same level of theory is applied to the NV excited-state channels and noting that future GW benchmarks would be valuable, but we maintain that the experimental agreement for N_C supports the reliability of the reported trends. revision: yes

  2. Referee: [Results] Results section (capture coefficients for NV): the reported hole capture coefficient of 1.8 × 10^{-7} cm³ s^{-1} for NV^- → NV^{0*} rests on the 1D configuration-coordinate approximation and the DFT-derived Huang-Rhys factors for the excited state; no independent validation against measured vibronic spectra or larger-supercell phonon calculations is presented, making this the load-bearing step for the central claim that capture occurs via excited states rather than ground states.

    Authors: We acknowledge that the 1D configuration-coordinate model is an approximation and that the NV excited-state capture rates rely on DFT-derived parameters without new direct comparison to experimental vibronic spectra. In the revision we will expand the discussion of the 1D approximation, citing prior literature validations for similar defects, and will explicitly state the limitations of the Huang–Rhys factors obtained from the configuration-coordinate diagrams. We did not carry out additional larger-supercell phonon calculations beyond the 512-atom cells already used, as these represent a substantial computational effort. Nevertheless, the central qualitative result—that ground-state capture rates are orders of magnitude slower than the excited-state pathways—remains robust within the model. We will revise the text to emphasize this distinction and to frame the reported coefficient as a prediction that can be tested against future vibronic or time-resolved measurements. revision: partial

Circularity Check

0 steps flagged

No circularity: capture coefficients derived from independent DFT+MPE computations benchmarked externally

full rationale

The paper computes nonradiative capture coefficients via the multiphonon emission model using DFT-derived total energies, configuration-coordinate diagrams, and electron-phonon matrix elements. These quantities are obtained from first-principles calculations and inserted into the rate formula; the resulting coefficients for N_C are then compared to separate experimental data rather than fitted to it. No equations reduce a claimed prediction to a fitted parameter or self-citation by construction, and the central results remain falsifiable against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

Calculations rest on standard DFT methodology and the multiphonon emission framework; no new entities introduced and no free parameters fitted to the target capture data.

axioms (2)
  • domain assumption Density functional theory with chosen functional and supercell size sufficiently captures the electronic structure and electron-phonon coupling for carrier capture rates.
    Central to all reported first-principles results.
  • domain assumption The multiphonon emission model applies without significant corrections from other mechanisms.
    Invoked for nonradiative capture processes.

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discussion (0)

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Reference graph

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