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REVIEW 3 major objections 4 minor 42 references

Monolayer control of spin-charge conversion in van der Waals heterostructures

T0 review · 3 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash

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Pith's one-line read Inserting a single monolayer of MoSe2 between PtSe2 and graphene reverses the sign of spin-charge conversion and roughly triples the emitted THz signal.

desk verdict Monolayer MoSe2 insertion flips sign and boosts THz spin-charge conversion; the experimental core is solid, but the quantitative kappa_yx agreement rests on an unverified Fermi-level assumption. read the letter →

arxiv 2501.02337 v1 pith:ZKACD6FA submitted 2025-01-04 cond-mat.mtrl-sci cond-mat.mes-hall

K. Abdukayumov , O. Paull , M. Mičica , F. Ibrahim , L. Vojáček , A. Wright , S. Massabeau , F. Mazzola
show 20 more authors
V. Polewczyk C. Jego R. Sharma C. Vergnaud A. Marty I. Gomes de Moraes A. Ouerghi H. Okuno A. Jana I. Kar J. Fuji I. Vobornik J. Li F. Bonell M. Chshiev M. Bibes J.-M. George H. Jaffrès S. Dhillon M. Jamet
This is my paper · ORCID
classification cond-mat.mtrl-scicond-mat.mes-hall
keywords vanderWaalsheterostructuresspin-chargeconversionTHzspintronicemissionRashbaspinsplittingPtSe2Mospin-resolvedARPESdensityfunctionaltheory
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 spin-charge conversion—the interconversion of spin and charge currents—in an epitaxial van der Waals stack can be switched at the level of a single inserted monolayer. Growing one monolayer of MoSe2 between PtSe2 and graphene changes the THz spintronic emission from a weak, negative-polarity signal to a strong, positive-polarity signal about 3.5 times larger. The authors attribute the switch to a change in how the interfacial Rashba states form: charge transfer from graphene to PtSe2 in the bilayer, versus strong electronic hybridization between PtSe2 and MoSe2 in the trilayer. They support this assignment with spin-resolved photoemission and density-functional calculations of the spin-charge conversion tensor. If correct, the result makes monolayer-level van der Waals stacking a practical design knob for spintronic THz emitters and related spin-orbitronic devices.

What carries the argument

The central object is the spin-charge conversion tensor $\kappa_{yx}$, a momentum-space integral of the spin expectation $\langle \sigma_y \rangle$ times the group velocity $v_x^g$ that quantifies how efficiently a spin current is converted into a charge current. The argument also rests on the 'sombrero' valence band, a Mexican-hat-shaped dispersion at the top of the PtSe2/MoSe2 valence bands whose large Rashba splitting (a momentum-dependent spin splitting caused by broken inversion symmetry at the interface) provides the dominant positive contribution to $\kappa_{yx}$. Spin-resolved photoemission supplies the direct observation of opposite spin polarization at $\pm k$, and THz time-domain spectroscopy supplies the experimental response that the tensor calculation is asked to match.

What would settle it

Measure the actual Fermi-level position or doping of the PtSe2/MoSe2/Gr and PtSe2/Gr stacks, for example by determining the Fermi-surface radius of the sombrero band with high-resolution ARPES or by core-level spectroscopy, and recompute the conversion coefficient over the corresponding energy window; if the sign then disagrees with the observed THz polarity, the proposed mechanism as stated would be falsified.

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Extended reading notes

Core claim

The central claim is that the sign and amplitude of spin-charge conversion in PtSe2 can be set by choosing which single van der Waals layer sits next to it. In PtSe2/graphene, the Rashba-split spin texture of the highest valence band is weak and the computed conversion coefficient $\kappa_{yx}$ is small and negative, matching the observed THz polarity; in PtSe2/MoSe2/graphene, the same band (the 'sombrero' band) undergoes strong hybridization with MoSe2, develops a large Rashba splitting, and drives $\kappa_{yx}$ to large positive values, matching the observed sign reversal and roughly 3.5 times stronger emission. Spin-ARPES confirms spin-momentum locking with opposite spins at $\pm k$, and DFT shows that the sombrero band sits closer to the Fermi level only when MoSe2 is present. The paper presents this as evidence that the controlling mechanism is electronic hybridization at the PtSe2/MoSe2 interface, distinct from the charge-transfer mechanism at the PtSe2/graphene interface.

Load-bearing premise

The calculations that convert the band structure into a sign for spin-charge conversion assume the Fermi level sits exactly at the zero of the computed bands in both stacks; if the real Fermi level lies elsewhere, the predicted sign of the conversion coefficient could change.

Editorial extensions

If this is right

  • A single-monolayer insert acts as a binary switch: replacing graphene with MoSe2 next to PtSe2 reverses the THz pulse polarity and increases its amplitude roughly threefold.
  • The same density-functional plus $\kappa_{yx}$ workflow can be used to screen other TMD pairs for large, sign-controlled spin-charge conversion before growing them.
  • The similar sombrero hybridization found for PtSe2/WSe2 indicates the mechanism is likely general to PtSe2 on semiconducting TMDs, not limited to MoSe2.
  • Large-area epitaxial van der Waals stacks, rather than exfoliated flakes, are sufficient to observe monolayer-level control of spin-charge conversion, which eases device integration.
  • The loss of the expected sixfold nonlinear THz symmetry in the trilayer shows hybridization also changes the electronic symmetry of the stack, with possible consequences for other nonlinear or valleytronic responses.

Reading between the lines

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

  • An independent measurement of the Fermi level in both stacks would test the mechanism more sharply than the assumed zero-energy alignment used in the calculations.
  • The hybridized sombrero band hints at a TMD analogue of an interfacial two-dimensional electron gas; a testable extension is to choose TMD pairs whose hybridized band crosses the Fermi level and look for metallic interface conductivity.
  • Because hybridization strength should depend on interlayer registry, a twisted PtSe2/MoSe2 stack could continuously tune the conversion coefficient between the charge-transfer and hybridization regimes, a knob the zero-twist epitaxial samples do not explore.
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Editorial analysis

A structured set of objections, weighed in public.

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

Referee Report

3 major / 4 minor

Summary. The paper reports epitaxial growth of PtSe2/MoSe2/graphene heterostructures and shows, via THz time-domain spectroscopy, that inserting a single MoSe2 monolayer between PtSe2 and graphene reverses the polarity and increases the intensity of the THz spintronic emission by about 3.5 times relative to PtSe2/graphene. Spin-ARPES and DFT calculations are used to attribute the change to two different interfacial mechanisms: charge transfer at the PtSe2/graphene interface and electronic hybridization at the PtSe2/MoSe2 interface. The DFT-based calculation of the spin-charge conversion tensor κ_yx yields opposite signs for the two stacks, which the authors present as qualitative agreement with the measured THz polarity.

Significance. If confirmed, the result would demonstrate monolayer-level control of spin-charge conversion in fully epitaxial, large-area van der Waals heterostructures, which is a notable step toward atomic-scale design of spintronic and THz devices. The paper combines high-quality MBE growth, structural characterization, spin-resolved photoemission, THz emission, and first-principles calculations; the κ_yx calculation is not fitted to the THz amplitudes, so the comparison is an independent consistency check rather than a circular fit. The main caveat is that the computed sign depends sensitively on the assumed Fermi level and integration window, which the authors explicitly acknowledge but do not test for robustness.

major comments (3)
  1. [DFT calculations (Eq. (1) and Fig. 4)] The computed sign of κ_yx depends directly on the assumed Fermi level position, which the authors set to zero energy in the band diagrams while noting that the exact position is unknown and may differ between PtSe2/Gr and PtSe2/MoSe2/Gr. The large positive κ_yx for PtSe2/MoSe2/Gr arises from the hybridized sombrero band whose top sits about 0.5 eV below the assumed Fermi level; a shift of roughly 0.2 eV, well within plausible doping or band-alignment uncertainty, could depopulate that band and reverse the sign of the integrated κ_yx. Because the sign agreement is a central consistency check for the proposed mechanism, the authors should provide a sensitivity analysis of κ_yx as a function of Fermi energy (for example over at least ±0.3 eV) and of the integration cutoff k_lim, and demonstrate that the sign difference between the two stacks is robust within the physically relevant range.
  2. [THz measurements (Fig. 3(c-d))] The claim that the PtSe2/MoSe2/Gr bilayer emits a THz electric field approximately 3.5 times stronger than PtSe2/Gr, with opposite polarity, is presented without error bars, repeated-sample statistics, or an uncertainty estimate. Since the intensity increase is one of the paper's central quantitative findings, the authors should report the mean and standard deviation over at least three independent samples or measurement runs, and specify how the 3.5x ratio was extracted from the time-domain traces.
  3. [DFT calculations (Fig. 4(b) and 4(e))] The restriction of the κ_yx integration to valence bands within the 1.55 eV photon-energy window is motivated only by the pump photon energy. The authors state that conduction bands show almost no spin polarization, but they do not demonstrate that deeper valence bands contribute negligibly. A justification of the integration window, or an estimate of the contribution from bands outside the window, is needed to establish that the computed values (-150 to 0 for PtSe2/Gr and about 600 for PtSe2/MoSe2/Gr) are not artifacts of the chosen cutoff.
minor comments (4)
  1. [Introduction] The sentence 'Only more recently have growth methods such as molecular beam epitaxy (MBE) and chemical vapor deposition (CVD) have produced high crystalline quality 2D materials' contains a duplicated auxiliary verb; it should read '...have growth methods ... produced...'.
  2. [Eq. (1)] The symbol v_x^g is used for the group velocity but is not defined in the main text; please define it immediately before or after Eq. (1).
  3. [Reference 28] The phrase 'Supplemental Metarial' is a typo and should read 'Supplemental Material'.
  4. [Fig. 3(e) and surrounding text] The discussion of the non-magnetic contribution S_NM would benefit from a brief explanation of why the absence of six-fold symmetry is interpreted as evidence for hybridization; as written, the link between symmetry reduction and hybridization is not immediately evident.

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity: the DFT-based kappa_yx check is independent of the measured THz polarity.

full rationale

The paper's central chain is: measure THz spintronic emission from PtSe2/Gr and PtSe2/MoSe2/Gr; characterize the band structure with Spin-ARPES and DFT; compute the SCC tensor kappa_yx from the calculated bands using Eq. (1) and compare qualitatively with the measured sign and relative intensity. Equation (1) contains only DFT-derived quantities (spin projection <sigma_y>, group velocity, and the chosen integration limits), with no term fitted to the THz amplitudes or polarity. The Fermi-level placement is explicitly stated as an assumption ('Since the exact position of the Fermi level is unknown and might be different for PtSe2/Gr and PtSe2/MoSe2/Gr, we assume that it is positioned at zero energy in the band diagrams'), and the integration window is tied to the 1.55 eV photon energy and klim = 0.6 |Gamma-K|; these are transparent modeling choices, not parameters extracted from the target data. A change in those choices could alter the computed sign, which is a legitimate robustness concern, but it does not make the computation circular. The comparison is qualitative and in arbitrary units, so the paper does not claim a fitted quantitative match. Self-citations to the authors' prior work [5,28] supply the growth system, the PtSe2/Gr reference THz data, and methodological details; these are empirical or technical anchors, and the new PtSe2/MoSe2/Gr observations and DFT calculations are self-contained relative to the cited baseline. No quoted step reduces a prediction to its input by construction, and no fitted parameter is renamed as a prediction. The analysis is therefore not circular; any reservations about Fermi-level or integration-window sensitivity belong to correctness risk, not circularity.

Assumptions & free parameters 3 free parameters · 4 assumptions · 1 invented entities

The main ledger items are modeling choices rather than new entities: the assumed Fermi level at zero, the k-space cutoff, and the valence-band-only window. These choices directly affect the computed kappa-yx sign and magnitude and thus the claimed agreement with the THz data.

free parameters (3)
  • Fermi level position = 0 eV (assumed relative to the band structure zero)
    The DFT section states: 'we assume that it is positioned at zero energy'. The computed kappa-yx sign and magnitude depend on which bands are occupied; a different position could change the theoretical SCC sign.
  • Integration cutoff k_lim = 0.6 x |Gamma-K|
    Eq. (1) uses k_lim = 0.6*|Gamma-K| to define the k-space window for kappa-yx. The cumulative value and final sign depend on this choice, which is not derived from data.
  • Valence band energy window near photon energy = Window within approximately 1.55 eV of the Fermi level (orange arrows in Fig. 4)
    Only valence bands inside the laser excitation window are included in the kappa-yx estimate. Changing the window width would alter the integrated SCC and the claimed agreement with the THz polarity.
assumptions (4)
  • domain assumption DFT with PBE functional and vdW corrections gives accurate band structure and spin texture for PtSe2/MoSe2/graphene heterostructures.
    Used throughout the DFT calculations section (Fig. 4). The experimental spin splitting is only bounded by 0.15 eV from spin-ARPES, so the exact DFT spin texture is not independently confirmed.
  • domain assumption Spin-charge conversion efficiency is proportional to the band-structure integral kappa-yx = integral <sigma_y> v_x^g 2*pi*|k| dk (Eq. 1), following the model of Vaz et al. (ref. 42).
    Borrowed from prior literature; the paper does not independently validate this mapping for these specific interfaces.
  • domain assumption Only valence bands contribute to SCC because conduction bands show almost no spin polarization in both systems.
    The DFT section states: 'We only focus here on the valence bands since the conduction bands show almost no spin polarization in both systems.' This excludes potential conduction-band contributions without a quantitative bound.
  • domain assumption The THz emission amplitude is directly proportional to the SCC efficiency of the 2D layer.
    The comparison between measured THz field strength and computed kappa-yx assumes that interface transmission and carrier dynamics do not distort the relative signal.
invented entities (1)
  • None
    purpose: No new physical entities are introduced in this paper.
    The paper relies on known materials, known electronic states, and a known band-structure model; no new particle, force, conserved quantity, or dimension is postulated.

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Pith. "Pith review of Monolayer control of spin-charge conversion in van der Waals heterostructures." pith.science (2026). https://pith.science/paper/ZKACD6FA

@misc{pith2026250102337,
  author       = {Pith},
  title        = {Pith review of: Monolayer control of spin-charge conversion in van der Waals heterostructures},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/ZKACD6FA}},
  note         = {Machine review of arXiv:2501.02337}
}
abstract

The diversity of 2D materials and their van der Waals (vdW) stacking presents a fertile ground for engineering novel multifunctional materials and quantum states of matter. This permits unique opportunities to tailor the electronic properties of vdW heterostructures by the insertion of only a single 2D material layer. However, such vdW materials engineering at the atomic scale has yet to be investigated for spin-charge interconversion phenomena. Here, we report on the control of these effects at the monolayer level, where drastic increase in intensity and change in sign of THz spintronic emission are demonstrated by inserting a single layer of MoSe$_2$ between PtSe$_2$ and graphene in a fully epitaxial, large area stacked structure. By using a combination of spin and angle resolved photoemission and density functional theory to reveal the electronic and spin structures, we illustrate two different mechanisms relying on charge transfer and electronic hybridization for the formation of Rashba states, which are responsible for spin-charge conversion and hence the THz spintronic emission. These findings open new pathways to design, at the atomic scale, efficient THz spintronic emitters made of 2D materials and other spintronic devices based on spin-charge interconversion phenomena.

Figures

Figures reproduced from arXiv: 2501.02337 by the authors.

Figure 1
Figure 1. FIG. 1: Growth and characterization of the PtSe [PITH_FULL_IMAGE:figures/full_fig_p013_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2: spin-ARPES of the PtSe [PITH_FULL_IMAGE:figures/full_fig_p014_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3: THz emission results. (a) and (b), schematic of femtosecond optical pumping and [PITH_FULL_IMAGE:figures/full_fig_p015_3.png] view at source ↗
Figures from the paper (1 more)
Figure 4
Figure 4. Figure 4: FIG. 4: Crystal structure and calculated charge density in PtSe [PITH_FULL_IMAGE:figures/full_fig_p016_4.png]

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Pith tools

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