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A minimal theory of nonradiative energy transfer from a two-dimensional (2D) moiré exciton to a nearby graphene layer is presented. From Fermi’s golden rule the transfer rate is the overlap of the exciton near-field spectrum with the dissipative density response of graphene, weighted by an exciton form factor, and it reproduces the established ΓET ∝ z−4 law in the point-dipole limit. A finite exciton size filters out the high-momentum near field once the spacer thickness approaches the transition-polarization radius RX, so the distance dependence of the rate — and of the photoluminescence (PL) quenching — probes the exciton size. A low-momentum expansion shows that, relative to the calibrated point-dipole response of the same bath, this leading correction is set by RX alone. In the ideal coherent-envelope limit the accompanying giant oscillator strength makes the rate non-monotonic in the exciton size, with a peak near ℓ𝑋≈𝑧. Treating graphene as a gate-tunable bath, Pauli blocking suppresses the interband channel once 2|μF| approaches ħω, partially restoring PL, and a full random-phase-approximation benchmark confirms the normalized interband distance dependence to within a few percent away from the threshold. Mapping the PL observables across the transition-metal dichalcogenide/hexagonal boron nitride/graphene parameter space, we find that a graphene gate acts not as a passive electrostatic element but as a tunable 2D electronic reservoir probed through exciton PL quenching.

権利情報:

• In Copyright
  

  © 2026 The Physical Society of Japan

キーワード: Moiré excitons, Graphene, Nonradiative energy transfer, Photoluminescence quenching, Exciton form factor, Pauli blocking, Transition-polarization radius

刊行年月日: 2026-10-15

出版者: Physical Society of Japan

掲載誌:

• Journal of the Physical Society of Japan (ISSN: 00319015) vol. 95 issue. 10 104701

研究助成金:

• Japan Society for the Promotion of Science JP25K01609
• Japan Society for the Promotion of Science JP22H05473

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6534

公開URL: https://doi.org/10.7566/jpsj.95.104701

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更新時刻: 2026-09-25 09:21:16 +0900

MDRでの公開時刻: 2026-09-25 10:38:48 +0900