Charge state tuning of spin defects in hexagonal boron nitride

Adrien Delpoux; Alain Claverie; Benjamin Lassagne; Cedric Robert; Delphine Lagarde; Gr\'egory Seine; James H. Edgar; Jeremie Grisolia; Jules Frauni\'e; Kenji Watanabe

REVIEW 3 major objections 6 minor 1 cited by

Charge state tuning of spin defects in hexagonal boron nitride

T0 review · 3 major / 6 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read In hBN flakes under 15 nm thick, an electric bias switches the optically active boron-vacancy defect VB- into the dark VB2- state.

desk verdict A genuinely new experimental effect—bias-induced PL quenching of VB- in ultra-thin hBN—with a clever asymmetric-defect control, but the charge-state interpretation is more bullish than the data support. read the letter →

arxiv 2501.18206 v1 pith:E4IQ63ED submitted 2025-01-30 cond-mat.mtrl-sci cond-mat.mes-hallquant-ph

Jules Fraunié , Tristan Clua-Provost , Sébastien Roux , Zhao Mu , Adrien Delpoux , Grégory Seine , Delphine Lagarde , Kenji Watanabe

show 9 more authors

Takashi Taniguchi Xavier Marie Thomas Poirier James H. Edgar Jeremie Grisolia Benjamin Lassagne Alain Claverie Vincent Jacques Cedric Robert

This is my paper · ORCID

classification cond-mat.mtrl-scicond-mat.mes-hallquant-ph

keywords boronvacancyhexagonalnitridechargestatetuningspindefectsvanderWaalsheterostructuresphotoluminescencequenchingquantumsensinggrapheneelectrodes

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

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

The reading

This paper reports that the charge state of boron-vacancy defects in ultrathin hexagonal boron nitride can be electrically tuned. In flakes less than 15 nm thick sandwiched between few-layer graphene electrodes, most vacancies sit in the optically active singly negative state VB- at zero bias, and applying up to ±3 V quenches their 850 nm photoluminescence by only a few percent. Because the 500 ps decay time does not change under bias, the authors read the quenching as a switch of whole defects into a dark charge state rather than a new non-radiative decay path. Using samples with deliberately uneven defect distributions, they identify the dark state as doubly negatively charged VB2-. The result matters for 2D quantum sensing because it shows that thin VB- layers can be integrated into van der Waals heterostructures with perpendicular electric fields while keeping most of their optical readout.

What carries the argument

The load-bearing element is the FLG/hBN/FLG metal-insulator-metal stack analyzed with a simple band-alignment picture. The relevant energy levels are the charge transition levels (CTLs) of the boron vacancy, the Fermi-level positions at which the defect changes its net charge; for hBN these are calculated to place the neutral/singly-negative transition 1.48–2.1 eV above the valence-band maximum and the singly/doubly-negative transition 4.9–5.2 eV above it, with the Fermi level between them at zero bias, stabilizing VB-. Workfunction measurements show that defective hBN has a workfunction about 0.2 eV below pristine hBN, nearly matching the graphene electrodes, so the authors assume near-flat bands at zero bias. Under bias, charge carriers tunnel from the nearby graphene electrode into the nearest VB- defects, converting them to VB2-; because only near-interface defects are reached, the quenching is a few percent and scales with the surface-to-volume ratio. Asymmetric defect distributions, made by ion implantation or by stacking an irradiated flake on a pristine one, provide the discriminating test that identifies VB2- as the product rather than VB0.

What would settle it

Count optically addressable VB- defects before and after applying the bias by integrating the optically detected magnetic resonance signal or by single-defect emission; a drop in emitter count matching the few-percent photoluminescence quenching would confirm charge-state switching, while an unchanged emitter count with dimmer emission would show a field effect on brightness instead.

Watch

Extended reading notes

Core claim

The paper demonstrates that in hBN flakes thinner than 15 nm sandwiched between few-layer graphene electrodes, the negatively charged boron vacancy VB- remains the stable optically active state at zero bias, and applying up to ±3 V (a perpendicular field of 0.2 V/nm) quenches its photoluminescence by only a few percent. The photoluminescence decay time stays at about 500 ps under bias, so the authors attribute the quenching to a reduction in the number of optically active defects rather than to new non-radiative channels. In samples with asymmetric vacancy distributions, photoluminescence quenching appears on the side where defects sit: positive bias quenches defects near the top electrode and negative bias quenches defects near the bottom electrode, identifying the final dark state as doubly negatively charged VB2- rather than neutral VB0. The authors conclude that thin VB- spin-defect layers can be embedded in van der Waals heterostructures that require perpendicular electric fields without losing more than a few percent of their optical signal.

Load-bearing premise

The central reading assumes that the measured photoluminescence tracks the number of optically active VB- defects, so that a drop in light with an unchanged decay time means some defects go completely dark rather than every defect emitting a little less under the applied field.

Editorial extensions

If this is right

Thin VB- sensing layers can be embedded in van der Waals heterostructures that require perpendicular electric fields up to 0.2 V/nm without losing more than a few percent of the optical readout signal.
The graphene/hBN/graphene geometry gives an electrical handle on the defect charge state, so the VB- photoluminescence can be modulated on demand by the applied bias.
For a given bias, the quenching fraction grows as the hBN flake gets thinner, because the effect is controlled by the surface-to-volume ratio rather than by total defect density.
The absence of leakage current and the unchanged decay time imply that charge exchange is local, occurring only between the electrodes and nearby vacancies, leaving the rest of the flake's defects untouched.
The results reconcile the observed gating-induced quenching with earlier null results in much thicker hBN: in an 80 nm flake the near-interface fraction is too small to produce a visible change.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

A testable extension the authors leave implicit is that applying a bias of the opposite polarity to a sample initially containing many VB2- or VB0 defects should repopulate VB- and increase the photoluminescence; the paper's model predicts such a recovery but does not demonstrate it.
If near-interface conversion is the only quenching channel, then thinning hBN toward a monolayer should eventually make the whole defect population interface-dominated, so the few-percent quenching could become much larger; this is an extrapolation beyond the 9.5–15 nm range studied.
The assumption that the Fermi level sits between the two CTLs at zero bias could be tested by using electrodes with different workfunctions, which should shift the bias polarity at which quenching begins.
A practical consequence for quantum sensing is that charge-state stability should be characterized per flake, since small differences in interface band alignment, not just thickness, may shift the bias at which photoluminescence is maximal, as seen in the +1.5 V shift of the implanted sample.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

The thing to know: this is a solid experimental letter with a real new result, but the headline interpretation—that the few-percent PL quenching means VB- → VB2- conversion—is underdetermined by the data they show. The asymmetric-defect experiments are the strongest part; the band-diagram assignment is the weakest.

What's new: Gale et al. saw no gating effect on VB- in 80 nm hBN. This group reports a reproducible few-percent PL quenching under ±3 V in <15 nm flakes, with stronger quenching in thinner flakes and no dependence on defect density. They also built two samples with deliberately asymmetric defect depth profiles and show the polarity dependence flips when defects sit near the top versus bottom electrode. That directional test is clever and is the best evidence for charge transfer at the FLG/hBN interfaces. They checked for leakage, repeated sweeps, and unchanged ~500 ps lifetimes, which rules out simple non-radiative channels.

Where it's soft: the unchanged lifetime does not exclude field-induced changes in absorption or collection efficiency, both of which would reduce PL without altering decay. So 'PL intensity tracks the number of VB- emitters' is an assumption, not a demonstrated fact. The zero-bias claim that most vacancies are singly negatively charged is inferred from PL being maximal at 0 V, but that only tells you the PL is at its own maximum; it doesn't give a charge-state fraction. The thickness-only dependence rests on a handful of samples without error bars on the quenching curves. And the VB2- assignment lives in a band diagram built from an electron affinity that the authors themselves say ranges from +1.7 to -0.5 eV, and CTLs from two different DFT groups; the +1.5 V offset in the implanted sample is explained by a built-in field they admit they cannot measure directly. None of this kills the core observation, but it does mean the charge-state transition is not securely identified. The text is honest about the tentative band diagram, which helps.

This paper deserves a serious referee. The experiment is novel and the asymmetric samples are a genuine control. I would recommend conditional acceptance: soften the charge-state language, add error bars and statistics, and explicitly discuss absorption/collection alternatives. It's a useful paper for anyone designing vdW heterostructures with thin hBN sensing layers.

Referee Report

3 major / 6 minor

Summary. The manuscript reports photoluminescence (PL) measurements on negatively charged boron-vacancy (VB-) defects in ultrathin hexagonal boron nitride (hBN) flakes sandwiched between few-layer graphene (FLG) electrodes. Under applied bias, the authors observe a few-percent PL quenching that is symmetric in bias for neutron-irradiated samples, stronger in thinner flakes, and accompanied by an unchanged ~500 ps PL decay time. In devices with asymmetric depth distributions of vacancies, produced either by ion implantation or by stacking an irradiated flake on a pristine flake, the bias dependence of the quenching becomes polarity-asymmetric. Using a Schottky-Mott band diagram with external charge-transition-level calculations, the authors interpret the quenching as conversion of VB- to the optically inactive VB2- state by electron tunneling from the nearby electrode, and they conclude that VB- remains robust under perpendicular electric fields up to 0.2 V/nm. The paper also reports Kelvin force microscopy on pristine, neutron-irradiated, and ion-implanted hBN flakes, and SRIM simulations of the implantation damage distribution.

Significance. If the charge-state interpretation is correct, the work is a useful experimental step for quantum sensing with ultra-thin hBN layers, showing that bias-induced charge-state changes can be controlled and that VB- retains most of its PL under fields relevant for van der Waals heterostructures. The manuscript has several strengths: the thickness-dependent quenching trend is coherent; the use of asymmetric defect profiles provides a directional test; the unchanged 500 ps lifetime and the absence of leakage current are useful negative controls; and the authors explicitly acknowledge the large uncertainties in the band-alignment parameters. However, the central claim that the PL quenching arises specifically from VB- to VB2- conversion rests on the assumption that PL intensity is proportional to the number of VB- emitters, an assumption that is not directly tested. Because field-dependent absorption or collection efficiency could also produce the observed quenching with unchanged lifetime, the significance of the paper is conditional on additional control measurements.

major comments (3)

[Figure 1c,d and text near 'The quenching in the integrated PL intensity...'] The inference that PL quenching reflects a reduction in the number of optically active VB- defects assumes that the measured PL intensity is proportional to the number of VB- emitters under fixed excitation. The unchanged 500 ps decay time rules out new non-radiative channels and a change in the radiative lifetime, but it does not rule out a field-induced decrease in the 532 nm absorption cross-section (e.g., a Stark shift or electro-absorption effect) or a bias-dependent change in PL outcoupling/collection efficiency in the FLG/hBN/FLG stack. Since the central charge-state assignment relies on this proportionality, the authors should provide a control measurement, such as the PL excitation spectrum or absorption/reflection under bias, or a measurement of per-emitter brightness, to verify that the per-defect emission rate is unchanged.
[Figure 2c,d and Figure 3d] The polarity asymmetry in the PL quenching does not uniquely select the VB- to VB2- transition over a transition to VB0. The authors themselves invoke an asymmetric built-in field to explain the +1.5 V PL maximum in the ion-implanted sample; with such a built-in field, a quadratic Stark/electro-absorption effect would also produce polarity-asymmetric PL without any charge-state change. Moreover, moving the defects from the bottom to the top interface changes the optical environment of the emitters in the stack, so a reversal of the polarity dependence could reflect an optical cavity or outcoupling effect rather than a charge-transfer direction. The VB2- assignment rests on the explicitly "tentative" band diagram, whose parameters span a wide range (electron affinity from +1.7 to -0.5 eV, CTL ranges from two theory papers). To support the charge-state claim, the authors need a more direct probe of the defect charge state or a quantitative model that includes both Stark/optical contributions and charge-transfer channels.
[Figure 3b-c and the paragraph on band diagram construction] The zero-bias conclusion that "most vacancies are singly negatively charged" is not established by the band diagram alone. The stated uncertainties in the electron affinity, workfunction, and CTL positions allow the Fermi level to lie closer to either the 0/-1 or the -1/-2 transition level, as the authors' own two extreme scenarios show. The asymmetric-device data are intended to select one scenario, but, as noted above, they do not currently exclude alternative explanations. The claim is therefore an assumption rather than a measured result, and this should be stated explicitly in the abstract and conclusions.

minor comments (6)

[Abstract] The abstract states that the results "reveal" a transition to the VB2- state, which is stronger than the evidence supports; consider wording such as "consistent with" a transition to VB2- unless direct charge-state evidence is added.
[Figure 1c and accompanying text] The statement that the quenching percentage "depends solely on the hBN thickness, rather than the defect density" is too strong given that only three samples are compared (two thicknesses and one lower-density sample); "solely" should be softened to something like "is much more sensitive to thickness than to defect density in this limited dataset."
[Figure 2c and text] The text says that in the ion-implanted sample "quenching with a positive bias begins at around +2.5 V," while the PL maximum is described later as shifted to +1.5 V; please clarify whether the onset of measurable quenching is defined relative to the shifted maximum, and make the description consistent.
[General] The abbreviation CTL is used without definition; please define "charge transition level" at first use.
[Figure 3a] The KFM comparison would be more convincing with error bars or the number of flakes measured; as presented, the ~0.2 eV workfunction difference appears to be a single comparison.
[Reference 37] Reference 37 is a legal disclaimer for SRIM; please cite the SRIM user manual or a peer-reviewed description of the simulation code instead.

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the PL quenching is a new measurement interpreted with external CTLs; underdetermination is not circularity.

full rationale

The paper's derivation chain is not circular. The central observable is a new PL-quenching measurement on FLG/hBN/FLG devices; the claimed VB- to VB2- transition is inferred from the bias polarity dependence of asymmetric defect distributions. The charge transition levels used to identify the final charge state are cited from external DFT calculations (Weston et al. 2018 and Strand et al. 2019), and the relevant work-function difference is measured in this work by KFM; neither is tuned to reproduce the PL curves. The asymmetric samples (ion-implanted, with vacancies concentrated near the bottom, and stacked, with vacancies near the top) provide a directional test: quenching occurs under the polarity expected for electron injection at the defect-rich interface, and the opposite sign in the two samples is a falsifiable cross-check rather than a fitted output. The only self-citations concern sample fabrication, neutron irradiation, and previously established VB- photophysics (refs 15, 16, 32, 34, 36); these are background facts and do not carry the charge-state assignment. The main limitation is underdetermination: unchanged 500 ps lifetime with PL quenching does not exclude field-dependent absorption or collection efficiency, and the band diagram is explicitly tentative. That is an empirical or correctness concern, not circularity. No equation in the paper reduces to its own input, and no fitted parameter is relabeled as a prediction. Accordingly, the circularity score is 0.

Assumptions & free parameters 1 free parameters · 5 assumptions · 0 invented entities

The paper's central mechanism rests on externally calculated charge transition levels and on two assumptions that convert measured PL changes into a population change of a specific charge state. No new particles or mediators are introduced; VB2- is a previously predicted state. The only hand-picked numeric input is the room-temperature band gap value used for the band diagram.

free parameters (1)

hBN room-temperature band gap Eg = 6.2 eV
Chosen by hand as 5.95 eV optical gap + 300 meV exciton binding - 50 meV temperature correction (text near Fig. 3). The band diagram placement of the Fermi level and charge transition levels depends on this choice, although the authors note the qualitative conclusion is unchanged across parameter sets.

assumptions (5)

domain assumption Schottky-Mott rule applies and Fermi-level pinning is negligible at FLG/hBN interfaces
Stated in the paragraph beginning 'Since we are dealing with vdW interfaces that have no dangling bonds...'. If interface dipoles or pinning are present, the band alignment and the predicted electron vs. hole tunneling asymmetry change.
domain assumption DFT charge transition levels for VB0/VB- and VB-/VB2- are accurate
The paper relies on CTLs from Weston et al. (ref 20) and Strand et al. (ref 21): 0/-1 at 1.48-2.1 eV and -1/-2 at 4.9-5.2 eV above VBM. These are not measured here and have an intrinsic spread.
domain assumption PL intensity is proportional to the number of VB- centers with unchanged per-defect emission rate under bias
Used when interpreting unchanged TRPL decay as evidence for fewer emitters rather than reduced efficiency. Absorption and collection efficiency are not measured under bias.
domain assumption KFM workfunction shift measured on exposed flakes is representative of buried device interfaces
The 0.2 eV reduction for defective hBN was measured on flakes on SiO2, not inside the FLG/hBN/FLG stack; surface contamination or the top graphene layer could alter the interface.
domain assumption SRIM simulation correctly predicts the depth distribution of ion-implantation vacancies
The asymmetry interpretation of Fig. 2c depends on the simulated factor-of-two higher vacancy density on the bottom side of the 18 nm hBN flake.

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Cite this review

Pith. "Pith review of Charge state tuning of spin defects in hexagonal boron nitride." pith.science (2026). https://pith.science/paper/E4IQ63ED

@misc{pith2026250118206,
  author       = {Pith},
  title        = {Pith review of: Charge state tuning of spin defects in hexagonal boron nitride},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/E4IQ63ED}},
  note         = {Machine review of arXiv:2501.18206}
}

read the original abstract

Boron vacancies in hexagonal boron nitride (hBN) are among the most extensively studied optically active spin defects in van der Waals crystals, due to their promising potential to develop two-dimensional (2D) quantum sensors. In this letter, we demonstrate the tunability of the charge state of boron vacancies in ultrathin hBN layers, revealing a transition from the optically active singly negatively charged state to the optically inactive doubly negatively charged state when sandwiched between graphene electrodes. Notably, there is a photoluminescence quenching of a few percent upon the application of a bias voltage between the electrodes. Our findings emphasize the critical importance of considering the charge state of optically active defects in 2D materials, while also showing that the negatively charged boron vacancy remains robust against external perpendicular electric fields. This stability makes it a promising candidate for integration into various van der Waals heterostructures.

Discussion (0). Continue with ORCID to comment.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Quantifying the creation of negatively charged boron vacancies in He-ion irradiated hexagonal boron nitride
cond-mat.mes-hall 2025-01 conditional novelty 5.0 of 10

Using a microscopic charge model plus a fitted background charge, the authors estimate that about 0.2% of all helium-created boron vacancies in hBN become optically active VB- defects, with the true fraction possibly higher.

Reference graph

Works this paper leans on

13 extracted references · 4 canonical work pages · cited by 1 Pith paper

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Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.

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R.; Young, A

(1) Dean, C. R.; Young, A. F.; Meric, I.; Lee, C.; Wang, L.; Sorgenfrei, S.; Watanabe, K.; Taniguchi, T.; Kim, P.; Shepard, K. L.; Hone, J. Boron Nitride Substrates for High- Quality Graphene Electronics. Nat. Nanotechnol. 2010, 5 (10), 722–726. https://doi.org/10.1038/nnano.2010.172. (2) Cadiz, F.; Courtade, E.; Robert, C.; Wang, G.; Shen, Y.; Cai, H.; T...

doi:10.1038/nnano.2010.172 2010

[2] [8]

Spin Defects in hBN as Promising Temperature, Pressure and Magnetic Field Quantum Sensors

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https://doi.org/10.48550/arXiv.2411.14152. (27) Xu, Z.-Q.; Mendelson, N.; Scott, J. A.; Li, C.; Abidi, I. H.; Liu, H.; Luo, Z.; Aharonovich, I.; Toth, M. Charge and Energy Transfer of Quantum Emitters in 2D Heterostructures. 2D Mater. 2020, 7 (3), 031001. https://doi.org/10.1088/2053- 1583/ab7fc3. (28) Gong, R.; He, G.; Gao, X.; Ju, P.; Liu, Z.; Ye, B.; H...

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