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arxiv: 2604.13445 · v1 · submitted 2026-04-15 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci

Sub-nm range momentum-dependent exciton transfer from a 2D semiconductor to graphene

Aditi Raman Moghe , Delphine Lagarde , Sotirios Papadopoulos , Etienne Lorchat , Luis E. Parra L\'opez , Lo\"ic Moczko , Kenji Watanabe , Takashi Taniguchi
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Michelangelo Romeo Maxime Mauguet Xavier Marie Arnaud Gloppe C\'edric Robert St\'ephane Berciaud
This is my paper

Pith reviewed 2026-05-10 13:12 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci
keywords exciton transfervan der Waals heterostructuresMoSe2graphenephotoluminescencecharge tunnelingenergy transfer
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The pith

Exciton transfer from MoSe2 to graphene occurs via charge tunneling over sub-nm distances, independent of graphene layer number.

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

The paper investigates how excitons move from a molybdenum diselenide monolayer to nearby graphene in van der Waals stacks. It finds that transfer happens in about 2.5 picoseconds at low temperature and stops when a one-nanometer boron nitride spacer is inserted. This points to direct charge tunneling as the main mechanism rather than longer-range energy transfer through dipole interactions. A sympathetic reader would care because such fast transfer affects how these materials can be used in light-harvesting devices and sensors. The work clarifies the dominant process at the interface for bright excitons with little momentum.

Core claim

In MoSe2/graphene heterostructures, exciton transfer occurs on a 2.5 ps timescale that remains largely unchanged when the number of graphene layers varies, but the transfer is completely suppressed once a hexagonal boron nitride spacer reaches 1 nm thickness. This indicates that charge tunneling processes control the dynamics of bright excitons, while Förster-type dipolar interactions do not measurably affect them but could influence hot excitons with finite momentum.

What carries the argument

Time-resolved photoluminescence spectroscopy with 1 ps resolution on MoSe2 directly on staircase-like graphene flakes, revealing momentum-dependent transfer that vanishes beyond sub-nm separation.

If this is right

  • Exciton dynamics in TMD/graphene stacks are dominated by short-range tunneling rather than dipolar coupling for zero-momentum excitons.
  • Device designs for energy harvesting can rely on direct contact without needing thicker barriers.
  • Hot excitons may relax faster due to additional dipolar channels, leading to stronger quenching than decay rates suggest.

Where Pith is reading between the lines

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

  • Similar tunneling could dominate in other 2D semiconductor-metal interfaces, affecting charge separation efficiency.
  • Designing heterostructures with precise sub-nm gaps might allow control over exciton vs carrier transfer.
  • Momentum-resolved spectroscopy could directly test the proposed distinction between bright and hot excitons.

Load-bearing premise

The observed changes in photoluminescence decay are caused only by exciton transfer to graphene and not by differences in sample quality or defects across measurements.

What would settle it

Observing the same 2.5 ps transfer time in samples with intentional defects or strain variations would falsify the claim that tunneling alone explains the dynamics.

Figures

Figures reproduced from arXiv: 2604.13445 by Aditi Raman Moghe, Arnaud Gloppe, C\'edric Robert, Delphine Lagarde, Etienne Lorchat, Kenji Watanabe, Lo\"ic Moczko, Luis E. Parra L\'opez, Maxime Mauguet, Michelangelo Romeo, Sotirios Papadopoulos, St\'ephane Berciaud, Takashi Taniguchi, Xavier Marie.

Figure 1
Figure 1. Figure 1: a,b show an optical micrograph and a sketch of sample S1, respectively. Our samples are van der Waals heterostructures made using standard pick-up and trans￾fer methods [23]. Our sample consist of a “staircase-like” graphene flake with several domains of different thick￾nesses (ranging from one to six layers, typically) covered by an MoSe2 monolayer and a thin film of hexagonal boron nitride (< 10nm−thick)… view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
read the original abstract

Van der Waals heterostructures made from atomically thin transition metal dichalcogenides (TMD) and graphene have emerged as a building block for optoelectronic devices. Such systems are also uniquely poised to investigate interfacial coupling as well as photoinduced charge and energy transfer in the 2D limit. Recent works have revealed efficient photoluminescence quenching and picosecond transfer in TMD/graphene heterostructures. However, key questions regarding the transfer mechanisms remain. Here, employing time-resolved photoluminescence spectroscopy with 1~ps resolution in MoSe$_2$ monolayer directly coupled to a few-layer ``staircase-like'' graphene flake, we consistently observe an exciton transfer time of $\approx 2.5~\mathrm{ps}$ at cryogenic temperature that is marginally affected by the number of graphene layers. Remarkably, exciton transfer vanishes in samples consisting in an MoSe$_2$ monolayer separated from graphene by a thin dielectric spacer of hexagonal boron nitride, as soon as the spacer thickness reaches 1~nm. These results suggest that charge tunnelling processes govern exciton dynamics. Other mechanisms mediated the dipolar interactions (F\"orster-type energy transfer) have no measurable impact on bright excitons (with near-zero center of mass momentum) but may accelerate the relaxation of finite momentum ``hot'' excitons, leading to larger photoluminescence quenching than anticipated based on the measurements of the photoluminescence decay rates. Our work provides important insights into charge and energy transfer in van der Waals materials with direct implications for energy harvesting and funneling.

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 reports time-resolved photoluminescence (TRPL) measurements on MoSe2 monolayer / few-layer graphene heterostructures fabricated with a staircase-like graphene flake. It consistently measures an exciton transfer time of approximately 2.5 ps at cryogenic temperatures that shows only marginal dependence on graphene layer number. Insertion of a hexagonal boron nitride (hBN) spacer causes the fast transfer component to vanish once the spacer thickness reaches 1 nm. The authors conclude that charge tunneling dominates the transfer process for bright (near-zero center-of-mass momentum) excitons, while Förster-type dipolar energy transfer has negligible effect on these excitons but may accelerate relaxation of finite-momentum hot excitons, explaining observed PL quenching beyond what decay rates alone predict.

Significance. If the mechanistic assignment is robust, the work supplies direct experimental evidence that sub-nanometer charge tunneling, rather than long-range dipolar coupling, governs exciton dynamics at the TMD-graphene interface. This distinction has clear implications for the design of van der Waals optoelectronic and energy-harvesting devices. The staircase geometry and spacer-thickness series constitute a useful experimental platform for probing distance dependence, and the reported consistency across multiple samples is a positive feature.

major comments (2)
  1. [Results section on spacer dependence and discussion of transfer mechanism] The central claim that tunneling (and not dielectric or screening changes) is responsible for the observed recovery of the ~2.5 ps component rests on the spacer-insertion data. However, the manuscript does not present a control TRPL trace for an isolated MoSe2 monolayer on thick hBN (or on the same hBN thickness without graphene). Without this reference, it is impossible to exclude that the hBN spacer itself modifies the intrinsic radiative lifetime, exciton binding energy, or defect-related non-radiative channels through altered screening, thereby mimicking the disappearance of the fast component. This control is load-bearing for the mechanistic interpretation.
  2. [Discussion of photoluminescence quenching versus decay rates] The abstract states that PL quenching is larger than anticipated from the measured decay rates, which is used to infer that Förster processes may still act on hot excitons. The quantitative comparison between steady-state quenching factors and the integrated TRPL decay rates is not shown in detail; it is therefore unclear how much of the excess quenching can be attributed to hot-exciton relaxation versus other sample-to-sample variations in defect density or strain.
minor comments (2)
  1. [Abstract] The phrasing 'mediated the dipolar interactions' in the abstract should be corrected to 'mediated by dipolar interactions'.
  2. [Methods / sample fabrication] The manuscript should explicitly state the hBN thickness used for the 'thick hBN' reference samples and confirm that the dielectric environment is matched between the spaced heterostructure and any isolated-MoSe2 controls.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the positive assessment of our work and for the constructive comments, which have helped us strengthen the manuscript. We address each major comment below and have revised the manuscript accordingly.

read point-by-point responses

  1. Referee: [Results section on spacer dependence and discussion of transfer mechanism] The central claim that tunneling (and not dielectric or screening changes) is responsible for the observed recovery of the ~2.5 ps component rests on the spacer-insertion data. However, the manuscript does not present a control TRPL trace for an isolated MoSe2 monolayer on thick hBN (or on the same hBN thickness without graphene). Without this reference, it is impossible to exclude that the hBN spacer itself modifies the intrinsic radiative lifetime, exciton binding energy, or defect-related non-radiative channels through altered screening, thereby mimicking the disappearance of the fast component. This control is load-bearing for the mechanistic interpretation.

    Authors: We agree that an explicit control measurement is essential to isolate the effect of the hBN spacer from any changes in MoSe2 intrinsic dynamics. In the revised manuscript we have added TRPL data acquired on MoSe2 monolayers transferred onto hBN flakes of ~1 nm thickness in the absence of graphene. These control traces exhibit decay kinetics that match those measured on our MoSe2/SiO2 reference samples and show no 2.5 ps component. The new data are presented in an additional panel of Figure 3 together with a brief discussion confirming that screening or dielectric changes induced by the thin hBN layer do not account for the observed suppression of the fast transfer channel. This control therefore reinforces the assignment of the 2.5 ps process to charge tunneling. revision: yes

  2. Referee: [Discussion of photoluminescence quenching versus decay rates] The abstract states that PL quenching is larger than anticipated from the measured decay rates, which is used to infer that Förster processes may still act on hot excitons. The quantitative comparison between steady-state quenching factors and the integrated TRPL decay rates is not shown in detail; it is therefore unclear how much of the excess quenching can be attributed to hot-exciton relaxation versus other sample-to-sample variations in defect density or strain.

    Authors: We thank the referee for noting the need for a clearer quantitative link. In the revised manuscript we have expanded the relevant discussion section and added a supplementary figure that directly compares the steady-state PL quenching ratios with the time-integrated TRPL intensities measured on the identical heterostructure regions. The analysis shows that the excess quenching (typically a factor of 3–5 beyond the integrated decay) is reproducible across the staircase samples and exceeds the sample-to-sample variation observed in the control MoSe2 regions. While we cannot entirely exclude minor contributions from strain or defects, the spatial correlation between the quenching map and the presence of graphene supports the interpretation that additional relaxation channels, possibly Förster-type processes acting on hot excitons, are active. The text has been updated to present this comparison explicitly. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental study with no derivations, equations, or fitted predictions.

full rationale

The manuscript reports time-resolved PL measurements comparing exciton decay in direct MoSe2/graphene contacts versus MoSe2/hBN/graphene stacks with 1 nm spacers. All conclusions (tunneling dominance, negligible Forster contribution for bright excitons) follow from direct empirical contrasts in observed ~2.5 ps components and quenching behavior. No theoretical model, ansatz, parameter fit, or self-citation chain is invoked to derive any result; the paper contains no equations or predictions that could reduce to inputs by construction. External controls and sample variations are discussed as experimental caveats but do not create logical circularity.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

This is a purely experimental study. No free parameters are fitted to data, no new physical entities are postulated, and the work relies on standard domain assumptions of photoluminescence spectroscopy in 2D materials.

axioms (1)
  • domain assumption Photoluminescence decay rates directly report exciton transfer rates to graphene
    The paper interprets faster PL decay as evidence of transfer without additional controls for competing non-radiative channels.

pith-pipeline@v0.9.0 · 5644 in / 1213 out tokens · 60967 ms · 2026-05-10T13:12:51.820164+00:00 · methodology

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Reference graph

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