Polarized electroluminescence with magnetic spectral tuning in van der Waals magnet CrSBr

Kenji Watanabe; Leyan Huang; Pingfan Gu; Shiqi Yang; Takashi Taniguchi; Xinyue Huang; Yilei Wang; Yuqia Ran; Yu Ye; Zuxin Chen

REVIEW 2 major objections 6 minor 43 references

Polarized electroluminescence with magnetic spectral tuning in van der Waals magnet CrSBr

T0 review · 2 major / 6 minor · reviewed 2026-08-07 · deepseek-v4-flash

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗

Pith's one-line read CrSBr LED emits 94.3% linearly polarized light that a magnetic field continuously tunes by 8 meV, establishing electrically driven van der Waals magnets as reconfigurable polarized light sources.

desk verdict First electrically driven polarized, magnetically tunable emission from CrSBr — a clean device demo that needs an I(B) control to close the thermal-artifact loophole. read the letter →

arxiv 2506.06734 v1 pith:IAT6PADB submitted 2025-06-07 cond-mat.mtrl-sci

Yilei Wang , Shiqi Yang , Leyan Huang , Yuqia Ran , Pingfan Gu , Xinyue Huang , Kenji Watanabe , Takashi Taniguchi

show 2 more authors

Zuxin Chen Yu Ye

This is my paper

classification cond-mat.mtrl-sci

keywords electroluminescencevanderWaalsmagnetCrSBrexciton-assistedtunnelingspincantinglinearpolarizationmagneto-excitoniccouplingwavelengthtunable

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 an electroluminescent device built from the van der Waals antiferromagnet CrSBr that emits near-infrared light with a degree of linear polarization of about 94.3% without any external polarizer. Because CrSBr's interlayer magnetic order responds to an applied magnetic field, the emission energy shifts continuously by about 8 meV as the spin configuration cants from antiferromagnetic to ferromagnetic. The work claims this is the first electrically driven van der Waals magnet light source that combines intrinsic polarization with magnetic spectral tuning, offering a route to reconfigurable on-chip polarized emitters. The mechanism is exciton-assisted inelastic tunneling, where electrons tunnel through a graphene/h-BN/graphene junction and transfer energy to excitons in an adjacent CrSBr flake, avoiding direct carrier injection. The paper argues that the magnetic tuning is governed by spin-canting-modulated interlayer hopping with $t_h \propto \cos(\theta/2)$.

What carries the argument

The central mechanism is exciton-assisted inelastic tunneling in a graphene/h-BN/graphene tunnel junction placed adjacent to a CrSBr flake: tunneling electrons lose energy inelastically and transfer it to excitons in CrSBr, which then radiatively recombine. The magnetic tunability comes from spin-canting-modulated interlayer hybridization, where the interlayer hopping integral scales as $t_h \propto \cos(\theta/2)$ with $\theta$ the angle between adjacent-layer magnetizations, renormalizing the band gap and shifting the exciton energy. The intrinsically polarized emission arises from CrSBr's quasi-1D electronic structure, with a nearly flat conduction band along the a-axis and a dispersive band along the b-axis, making optical transitions strongly linear-polarized along the b-axis.

What would settle it

A concrete experiment that would settle the claim is to measure the EL spectrum, the tunneling current, and the device temperature simultaneously as a function of magnetic field at a fixed bias, and to compare the EL peak shift with a magnetization measurement of the same CrSBr flake. If the EL peak shift does not track the spin-canting curve, or if it occurs with the field along the easy axis where no canting occurs, or if the tunneling current changes substantially over the same field range, the spin-canting attribution would be falsified.

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Extended reading notes

Core claim

The central claim is that an electroluminescent device based on exciton-assisted inelastic tunneling in the anisotropic van der Waals magnet CrSBr emits polarized light whose wavelength is continuously tunable by a magnetic field. The emitted light is dominated by the surface exciton peak at about 1.34 eV with a degree of linear polarization of 94.3% (reaching 99.0% in a thicker device), and applying a magnetic field along the hard c-axis produces a continuous 8 meV redshift of the electroluminescence peak as the interlayer spin configuration goes from antiferromagnetic to ferromagnetic through spin canting. The tuning follows a quadratic energy shift $\Delta E \propto B^2$ below the saturation field of about 2.3 T. The paper attributes this behavior to field-dependent interlayer exciton hybridization, with interlayer hopping scaling as $t_h \propto \cos(\theta/2)$, where $\theta$ is the angle between adjacent-layer magnetizations. The device operates at ultralow currents below 1 microampere because energy transfer via inelastic tunneling bypasses the need for direct carrier injection into the emission layer.

Load-bearing premise

The load-bearing premise is that the observed 8 meV electroluminescence redshift is caused by spin canting in CrSBr through interlayer hybridization, not by magnetic-field-induced changes in the tunneling current, device temperature, or other artifacts; the paper relies on prior photoluminescence studies for the saturation field of 2.3 T and does not report EL current versus field or direct magnetization measurements on the device.

Editorial extensions

If this is right

If the central claim holds, CrSBr and similar van der Waals magnets can serve as electrically driven, polarization-preserving light sources whose emission wavelength is set by an external magnetic field.
Combining near-unity linear polarization with continuous spectral tuning in a single device would remove the need for external polarizers and multiple fixed-wavelength emitters in on-chip photonics.
Magnetic-field-controlled spectral tuning could enable reconfigurable optical interconnects and polarization-resolved spectroscopy without any moving parts.
The exciton-assisted tunneling mechanism could generalize to other van der Waals magnets and magnetic semiconductors, offering a generic route to magnetically tunable electroluminescence.
The preservation of polarization in electroluminescence relative to photoluminescence suggests tunneling-based energy transfer does not depolarize excitons, which may allow electrical probing of spin-exciton physics in magnetic van der Waals materials.
These devices, if developed further, could act as compact sources for near-infrared applications in telecommunications, biological imaging, and quantum technologies that currently rely on bulkier or less tunable emitters.

Reading between the lines

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

A direct test that is not reported in the paper would be to measure the tunneling current and device temperature against magnetic field at fixed bias; if the current changes appreciably with field, part of the 8 meV shift could come from Joule heating or field-dependent electrode band structure rather than from spin canting in CrSBr itself.
The quadratic-in-field energy shift below saturation is consistent with the interlayer-hopping picture, but comparing the EL shift to a magnetization curve measured on the same device would establish whether the tuning tracks the interlayer spin correlation function itself or simply $B^2$.
The paper's operation is limited to temperatures below about 110 K; extending magnetic spectral tuning to room temperature would require a different van der Waals magnet with a higher magnetic ordering temperature, a direction the paper leaves unexplored.
The paper notes parallel findings posted by another group; independent confirmation of magnetically tunable electroluminescence in CrSBr would strengthen the case that exciton-assisted tunneling is a robust tool for electrically probing and controlling magnetic excitons.

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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

First, the substantive new thing: this paper makes CrSBr emit electroluminescence via exciton-assisted tunneling through a graphene/h-BN/FLG stack, and the emission is linearly polarized (DOLP ~94.3%) and shifts red by 8 meV as an out-of-plane field takes the interlayer spin order from AFM through canted to FM. The ingredients were known separately — CrSBr's anisotropic excitons and spin-canting band tuning in PL, and exciton-assisted tunneling in other vdW stacks — but the electrical generation with magnetic spectral tuning is new, and the device looks clean: EL confined to the overlap region, linear EL-current relation, PL/EL spectra consistent, and the tuning behavior matches prior PL studies.

The weak spot is a missing electrical control. The field-dependent EL spectra are all taken at fixed V_bias = 3.1 V, and there is no measurement of tunneling current versus field or device temperature. Since their own temperature series (Fig. 2c) shows the P peak redshifts strongly with heating, a field-induced change in junction conductance or Joule heating could in principle account for a good part of the 8 meV shift. The PL comparison is supportive but doesn't constrain the electrical state, because PL is optically pumped. I'd want to see I(B) at fixed bias, or a constant-current measurement, plus error bars on the peak positions and DOLP. Also: only two devices, one shown in the main text, and raw data are only "available upon request." None of these are load-bearing flaws — the physics is plausible and the field scale B_sat = 2.3 T matches the known magnetic behavior — but they are easy to address and would make the central claim much more robust.

The quadratic B^2 fit is a fit to their own data, not a prediction, and they do not oversell it. They also disclose a parallel preprint [43], which is the right way to handle priority concerns.

Bottom line: worth a serious referee. The central claim is probably right but needs the I(B) control to close the thermal/conductance loophole before publication. This is a solid device demonstration for people working on 2D magnets and vdW optoelectronics, not a paradigm shift. I would send it to review with a request for that control and error estimates.

Referee Report

2 major / 6 minor

Summary. The paper reports electrically driven polarized light emission from a CrSBr/h-BN/graphene vertical heterostructure, operating via exciton-assisted inelastic tunneling. The authors demonstrate EL spatially confined to the overlap region, a linear EL-intensity-versus-current relation, near-unity degree of linear polarization (DOLP ≈ 94.3% for Device 2, 99.0% for Device 1), and a continuous magnetic-field-induced redshift of the dominant P exciton peak of about 8 meV below the saturation field B_sat = 2.3 T. The magnetic tuning is attributed to field-induced spin canting and interlayer exciton hybridization, with an interlayer hopping parameter scaling as t_h ∝ cos(θ/2). The claim is that this constitutes the first electrically driven van der Waals magnet light source combining intrinsic polarization and continuous spectral tuning.

Significance. If the central claim holds, the work is significant: it demonstrates a new functionality for van der Waals magnets, merging polarized emission with magnetic spectral control in an electrically driven device. The measurement set is internally coherent: the linear EL-current relation (Fig. 2b), spatial mapping (Fig. 1d), PL/EL spectral comparison (Fig. 1e), polarization analysis (Fig. 3), and field-dependent peak shifts (Fig. 4) are mutually consistent. The authors also report on two devices and show in the Supplementary Information that Device 1 reproduces the magnetic-field-induced behavior. The main weakness is the absence of a direct electrical control for the field-dependent EL spectra, which is load-bearing for the magnetic-tuning attribution.

major comments (2)

[§4, Fig. 4b,c] The central magnetic-tuning claim is supported by EL spectra taken at a fixed bias V_bias = 3.1 V, but the paper does not report the EL tunneling current I(B) or the device temperature during the magnetic-field sweep. Because the P-peak energy is strongly temperature dependent (Fig. 2c shows a pronounced redshift from 2 K to 90 K), and because a magnetic field can alter the tunneling conductance of the graphene/h-BN/FLG/CrSBr stack through band shifts or magnetoresistance, the observed 8 meV redshift could in principle be caused by a field-induced change in dissipated power or in the electrical bias point rather than by spin-canting-driven band renormalization. The PL comparison (Fig. 4a) is supportive but does not close this control, since PL is optically pumped and does not constrain the electrical state of the EL junction. I request that the authors provide an I(B) trace at the same fixed bias, or EL spectra acquired at constant current, to rule out this alternative explanation.
[§4, Fig. 4c] The quantitative model for the field-induced shift is presented as a quadratic fit (ΔE ∝ B^2) with a single free coefficient, while the underlying parameter t_h ∝ cos(θ/2) is taken from prior literature. The fit is not a parameter-free prediction, and the manuscript does not report an independent measurement of the spin canting angle in the operating device (e.g., magnetization or magneto-transport data). Thus the mechanism is plausible but not uniquely constrained by the presented data. The missing I(B) control in the previous comment is the more direct way to solidify the attribution; providing a fit of the full angular dependence using the known CrSBr spin Hamiltonian would strengthen the quantitative claim.

minor comments (6)

[§3, Fig. 3c,d] DOLP values are quoted without uncertainties or a statement of the number of independent angle settings; please provide error bars or confidence intervals for the polarization degree.
[§4, Fig. 4c] The EL peak positions in Fig. 4c are shown without error bars; please state the spectral fitting procedure and the uncertainty of the peak-energy determination, especially because the 8 meV shift is not much larger than typical linewidth variations.
[Introduction] The phrase "three breakthroughs" is promotional and would be better replaced by a neutral description of the device capabilities.
[Introduction, paragraph 2] There is a typo: "linealy polarized excitons" should be "linearly polarized excitons".
[References, [33]] Reference 33 is cited to support the nearly flat conduction band along Γ–X in CrSBr, but the cited paper (Funk et al., Phys. Rev. Research 3, L042019, 2021) is about WSe2 phonon sidebands. Please verify the citation or replace it with a CrSBr-specific band-structure reference.
[Fig. 1d caption] "Spacial mapping" should be "Spatial mapping".

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: the reported EL polarization and magnetic spectral tuning are direct measurements, and the interpretive model is imported from independent prior work rather than derived from the same data.

full rationale

The paper's central claims are measured quantities, not outputs of a fitted model that has been renamed as a prediction. The DOLP of approximately 94.3% is obtained by angle-resolved EL intensity measurements (Fig. 3d), and the 8 meV magnetic-field-induced EL redshift is read directly from the EL spectra in Fig. 4b, with the quadratic dependence in Fig. 4c presented as a fit to those data. The spin-canting interpretation uses B_sat = 2.3 T and the interlayer hopping scaling t_h proportional to cos(theta/2), both taken from prior photoluminescence and magneto-optical studies (refs. 25, 39-42), which are external to this paper and independently established. No load-bearing self-citation chain appears; the cited tunneling mechanism (ref. 27) and CrSBr exciton properties (refs. 24-26, 37) are external. The main scientific weakness is the absence of an EL current-versus-field control during fixed-bias field sweeps, which could in principle allow thermal or bias-point artifacts to contribute to the redshift; however, this is a missing control or a risk to the mechanistic attribution, not a circularity in which the conclusion is equivalent to the input by construction. The polarization and tuning are measured, and the model is imported from independent literature, so the derivation chain is not circular.

Assumptions & free parameters 1 free parameters · 3 assumptions · 0 invented entities

No new physical entities are introduced. The central claims rest on one fitted quadratic coefficient and on several domain assumptions imported from prior CrSBr studies. No evidence of circular fitting that masquerades as prediction.

free parameters (1)

quadratic tuning coefficient c in Delta E = c B^2 = not stated in text
Used to describe the 8 meV shift below B_sat in Fig. 4c. The quadratic dependence is fitted to the data, not predicted from a first-principles derivation.

assumptions (3)

domain assumption The observed EL arises from exciton-assisted inelastic tunneling energy transfer to CrSBr, not from direct carrier injection or impact ionization.
Based on the I-V curve, linear EL intensity versus current in Fig. 2b, and the prior mechanism of Ref. [27]. No single-exciton or time-resolved measurement directly verifies the energy-transfer pathway.
domain assumption The magnetic-field-induced redshift of the EL P peak reflects CrSBr spin-canting band renormalization with B_sat = 2.3 T from previous studies.
The device-level EL tuning is attributed to the material's spin canting using the prior scale from Refs. [39-42]. The paper does not measure magnetization in the device, and field-induced changes to the tunnel junction are not reported.
domain assumption The assignment of the P, X*, and X_d peaks to surface excitons, bulk excitons, and defect states follows the prior literature.
The spectral identification is lifted from Refs. [26,30-32] and applied to the PL and EL spectra without independent verification.

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Cite this review

Pith. "Pith review of Polarized electroluminescence with magnetic spectral tuning in van der Waals magnet CrSBr." pith.science (2026). https://pith.science/paper/IAT6PADB

@misc{pith2026250606734,
  author       = {Pith},
  title        = {Pith review of: Polarized electroluminescence with magnetic spectral tuning in van der Waals magnet CrSBr},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/IAT6PADB}},
  note         = {Machine review of arXiv:2506.06734}
}

abstract

Polarized wavelength-tunable electroluminescence (EL) represents a critical on-demand functionality for next-generation optoelectronics. While conventional van der Waals (vdW) EL devices offer discrete wavelength switching constrained by fixed emission states, we report a novel platform enabling continuous spectral tuning combined with intrinsically polarized emission. By leveraging exciton-assisted inelastic tunneling in the anisotropic magnet CrSBr, our devices achieve uniform EL with a near unity degree of linear polarization ($\approx$ 94.3$\%$). The strong magneto-electronic coupling in CrSBr facilitates continuous magnetic-field-controlled spectral tuning through spin canting-induced band renormalization. This work establishes vdW magnets as a versatile platform for developing reconfigurable polarized light sources with simultaneous spectral and polarization control.

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Pith tools

Reviewed August 7, 2026 · model on record in the stance chip above.

[1] [43]

All-electrical near-field injection of excitons in a van der Waals antiferromagnet

Ziegler, J. D.et al.All-electrical near-field injection of ex- citons in a van der waals antiferromagnet.arXiv preprint arXiv:2505.15457(2025)

work page Pith review arXiv 2025

[2] [1]

B¨ unzli, J.-C. G. & Eliseeva, S. V. Lanthanide nir lumi- nescence for telecommunications, bioanalyses and solar energy conversion.Journal of Rare Earths28, 824–842 (2010)

work page 2010

[3] [2]

Hong, G., Antaris, A. L. & Dai, H. Near-infrared fluo- rophores for biomedical imaging.Nature biomedical en- gineering1, 0010 (2017)

work page 2017

[4] [3]

Lee, C.et al.Indefinite and bidirectional near-infrared nanocrystal photoswitching.Nature618, 951–958 (2023)

work page 2023

[5] [4]

Yuan, F.et al.Bright and stable near-infrared lead-free perovskite light-emitting diodes.Nature Photonics18, 9 (2024)

work page 2024

[6] [5]

Pu, J.et al.Continuous color-tunable light-emitting de- vices based on compositionally graded monolayer transi- tion metal dichalcogenide alloys.Advanced Materials34, 2203250 (2022)

work page 2022

[7] [6]

Duan, X.et al.Synthesis of ws2 x se2–2 x alloy nanosheets with composition-tunable electronic proper- ties.Nano letters16, 264–269 (2016)

work page 2016

[8] [7]

Wang, S., Ukhtary, M. S. & Saito, R. Strain effect on cir- cularly polarized electroluminescence in transition metal dichalcogenides.Physical Review Research2, 033340 (2020)

work page 2020