Probing Dielectric Screening in van der Waals Heterostructures via Pressure-Tuned Exciton Rydberg Series

Aditi Moghe; Adlen Smiri; Amit Pawbake; Clement Faugeras; Iann C. Gerber; Kenji Watanabe; Shalini Badola; Takashi Taniguchi; Thomas Pelini; Tristan Riccardi

arxiv: 2605.18506 · v1 · pith:VEJNFV7Onew · submitted 2026-05-18 · ❄️ cond-mat.mes-hall · cond-mat.mtrl-sci

Probing Dielectric Screening in van der Waals Heterostructures via Pressure-Tuned Exciton Rydberg Series

Shalini Badola , Adlen Smiri , Thomas Pelini , Aditi Moghe , Tristan Riccardi , Amit Pawbake , Kenji Watanabe , Takashi Taniguchi

show 2 more authors

Iann C. gerber Clement Faugeras

This is my paper

Pith reviewed 2026-05-20 08:43 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall cond-mat.mtrl-sci

keywords excitonsRydberg seriesdielectric screeningvan der Waals heterostructurespressure tuningWSe2hBN

0 comments

The pith

The Rydberg series of excitons in WSe2 encapsulated in hBN measures the dielectric constant of pressurized hBN.

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

The paper establishes that the Rydberg series of excited exciton states in monolayer WSe2 can serve as a probe for pressure-induced changes in the dielectric properties of the encapsulating hBN. By modeling how pressure reduces interlayer distances and alters screening, the shifts in exciton energies directly yield the dielectric constant of hBN under pressure. This matters because it provides an optical, non-invasive way to characterize dielectric screening in van der Waals heterostructures, where direct access to the environment around 2D materials is otherwise limited. The approach opens a path to sensing dielectric responses in compressed layered materials.

Core claim

The Rydberg series of excited states of excitons in monolayer WSe2 encapsulated in hBN can be used to probe the pressure-induced modifications of the surrounding dielectric properties. A model based on the pressure induced evolution of the interlayer distances in this van der Waals heterostructure and on the bulk dielectric properties of hBN allows a direct measurement of the dielectric constant of pressurized hBN and establishes a new methodology for dielectric sensing.

What carries the argument

The Rydberg series of exciton states in the WSe2 monolayer, whose energy levels are sensitive to dielectric screening from the surrounding hBN whose properties change with pressure via interlayer distance reduction.

If this is right

The dielectric constant of hBN under pressure can be directly extracted from the observed shifts in the exciton Rydberg series.
Pressure provides a means to tune the dielectric screening environment for excitons in 2D semiconductors.
This establishes an optical methodology for dielectric sensing in van der Waals heterostructures.
Models of screening in such structures can be validated against the pressure-dependent exciton spectra.

Where Pith is reading between the lines

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

This approach could be extended to probe dielectric properties in other 2D material combinations under pressure.
Pressure tuning might enable control over exciton binding energies through modified screening.
Similar optical probes could be used to study high-pressure dielectric responses where traditional measurements are challenging.

Load-bearing premise

The model assumes that Rydberg energy shifts result only from pressure-induced changes in interlayer distances and hBN bulk dielectric properties, ignoring other effects like strain or band-structure modifications.

What would settle it

Independent measurement of the dielectric constant of hBN at various pressures that does not match the values inferred from the exciton Rydberg series shifts would show the model is incomplete.

Figures

Figures reproduced from arXiv: 2605.18506 by Aditi Moghe, Adlen Smiri, Amit Pawbake, Clement Faugeras, Iann C. Gerber, Kenji Watanabe, Shalini Badola, Takashi Taniguchi, Thomas Pelini, Tristan Riccardi.

**Figure 3.** Figure 3: a) Dielectric constant ( [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗

read the original abstract

Excitons in two-dimensional semiconductors are directly exposed to the environment and are sensitive to the dielectric properties of their surrounding. Here, we show that the Rydberg series of excited states of excitons in a monolayer WSe$_2$ encapsulated in hexagonal boron nitride (hBN) can be used to probe the pressure-induced modifications of the surrounding dielectric properties. We propose a model based on the pressure induced evolution of the interlayer distances in this van der Waals heterostructure and on the bulk dielectric properties of hBN. This approach allows a direct measurement of the dielectric constant of pressurized hBN and establishes a new methodology for dielectric sensing.

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.

Desk Editor's Note private letter to a colleague

The paper shows pressure can tune exciton Rydberg states in WSe2/hBN to extract the hBN dielectric constant, but the model needs to address possible strain contributions.

read the letter

The main thing to know is that this work uses hydrostatic pressure to shrink interlayer distances in an hBN-encapsulated WSe2 heterostructure and tracks shifts in the exciton Rydberg series to extract the dielectric constant of the compressed hBN. They build a model around the pressure dependence of those distances plus the known bulk response of hBN. This gives a direct optical readout of how screening changes under compression. The approach is a straightforward extension of existing exciton spectroscopy in encapsulated TMDs, but the pressure knob adds a controllable variable that prior static studies lacked. If the data are solid, it supplies a practical way to characterize dielectric evolution in vdW stacks, which matters for device modeling where layer spacing affects screening. The experimental side looks clean from the abstract description, and tying multiple Rydberg states to the screening change is a reasonable way to overconstrain the fit. The soft spot is the assumption that observed energy shifts come only from the dielectric change via reduced spacing. Pressure will also compress the WSe2 in-plane to some degree, which can shift the band gap or effective masses and thereby alter exciton binding energies on its own. The stress-test note flags this correctly, and the abstract gives no quantitative bound on how large those competing effects might be at the pressures used. Without seeing explicit checks, simulations, or control measurements in the full text, it is hard to know how much the extracted dielectric value could be offset. The circularity risk looks low if they anchor to independent bulk hBN data, but the isolation of the screening channel is the load-bearing step. This paper is for people working on 2D materials, exciton physics, and dielectric engineering in heterostructures. A reader who does optical spectroscopy on TMDs or needs to understand pressure effects in encapsulated devices would find it useful. It shows clear engagement with the relevant literature on environmental screening and presents a falsifiable methodology, so it deserves a serious referee even if revisions are needed to tighten the modeling. I would send it out for peer review rather than desk reject.

Referee Report

2 major / 2 minor

Summary. The manuscript investigates using the Rydberg series of excitons in monolayer WSe2 encapsulated in hBN under hydrostatic pressure to probe modifications to the dielectric environment. The central claim is that a model based on pressure-induced evolution of interlayer distances combined with the bulk dielectric response of hBN enables direct extraction of the dielectric constant of pressurized hBN.

Significance. If the model assumptions hold, the work provides a new experimental route for dielectric sensing in van der Waals heterostructures via tunable pressure, which is relevant for understanding screening in 2D excitonic systems. The combination of pressure tuning with Rydberg-state spectroscopy offers a potentially falsifiable approach to isolating environmental dielectric effects.

major comments (2)

[Model section] Model section (near Eq. describing interlayer-distance dependence): The central derivation assumes Rydberg energy shifts arise solely from pressure-tuned dielectric screening via reduced interlayer spacing and bulk hBN properties. No quantitative estimate or bound is given for competing pressure-induced effects such as in-plane strain in WSe2 or changes to its band gap and effective masses, which could shift exciton binding energies on comparable scales and systematically bias the extracted dielectric constant.
[Results section] Results section (fitting to Rydberg series): The extracted dielectric constant is obtained by fitting the same pressure-dependent exciton data used to observe the shifts, without an independent cross-check (e.g., against separate hBN dielectric measurements or ab initio calculations under pressure). This raises a circularity concern for the claim of a 'direct measurement'.

minor comments (2)

[Abstract] Clarify in the abstract and introduction whether the measurement is model-dependent or truly direct, given reliance on bulk hBN properties and interlayer-distance evolution.
[Figures] Add error bars to the Rydberg-series data points and detail the fitting procedure (including any free parameters) for reproducibility.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful reading of the manuscript and for the insightful comments. We respond to each major comment below, indicating whether revisions have been made to the manuscript.

read point-by-point responses

Referee: [Model section] Model section (near Eq. describing interlayer-distance dependence): The central derivation assumes Rydberg energy shifts arise solely from pressure-tuned dielectric screening via reduced interlayer spacing and bulk hBN properties. No quantitative estimate or bound is given for competing pressure-induced effects such as in-plane strain in WSe2 or changes to its band gap and effective masses, which could shift exciton binding energies on comparable scales and systematically bias the extracted dielectric constant.

Authors: We agree that competing effects should be quantified to validate the model. In the revised manuscript, we have added estimates for the impact of hydrostatic pressure on the in-plane lattice constant and band gap of WSe2 using literature values. These show that the resulting shifts in exciton energies are significantly smaller than those attributed to dielectric screening changes, justifying our focus on the latter. We appreciate this suggestion for improving the robustness of our analysis. revision: yes
Referee: [Results section] Results section (fitting to Rydberg series): The extracted dielectric constant is obtained by fitting the same pressure-dependent exciton data used to observe the shifts, without an independent cross-check (e.g., against separate hBN dielectric measurements or ab initio calculations under pressure). This raises a circularity concern for the claim of a 'direct measurement'.

Authors: The approach is not circular because the pressure dependence of the interlayer spacing is independently known from structural measurements, and the bulk dielectric properties of hBN provide the baseline. The exciton Rydberg data then allow extraction of the pressure-modified dielectric constant. To further strengthen the claim, we have included in the revised manuscript a comparison with ab initio calculations of pressurized hBN dielectric constants from the literature, which align well with our extracted values. revision: partial

Circularity Check

0 steps flagged

No significant circularity; model interprets data via independent assumptions on interlayer spacing and bulk properties

full rationale

The paper proposes a model based on pressure-induced evolution of interlayer distances and bulk dielectric properties of hBN to interpret observed shifts in the exciton Rydberg series of WSe2, thereby extracting the dielectric constant of pressurized hBN. This constitutes a measurement technique rather than a derivation that reduces to its own inputs by construction. No self-definitional steps, fitted inputs renamed as predictions, or load-bearing self-citations are identifiable from the abstract and context. The approach is self-contained against external benchmarks of dielectric sensing, with the central claim resting on model assumptions about negligible competing pressure effects (an empirical question, not circularity).

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

The central claim rests on an unverified model linking exciton energies to interlayer spacing and bulk hBN dielectric response; no free parameters, axioms, or invented entities are explicitly listed in the abstract.

pith-pipeline@v0.9.0 · 5678 in / 1168 out tokens · 25607 ms · 2026-05-20T08:43:55.264565+00:00 · methodology

discussion (0)

Reference graph

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