# Graphene as a Tunable Nonradiative Bath for Moiré Excitons

https://mdr.nims.go.jp/datasets/bb5307cc-7b12-470a-b2a7-381037ec3ee1

## File

- [71972.pdf](https://mdr.nims.go.jp/filesets/5884fce9-dcf0-46b4-b760-fdcb71228bda/download) ([Detail](https://mdr.nims.go.jp/filesets/5884fce9-dcf0-46b4-b760-fdcb71228bda.md))

## Id

bb5307cc-7b12-470a-b2a7-381037ec3ee1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-09-24T09:37:27.840822Z

## Updated at

2026-09-25T00:21:16.335086Z

## Published at

2026-09-25T01:38:48.463006Z

## Doi

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

## First published url

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

## Date published

2026-10-15

## Recorded date published

2026-10-15

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Graphene as a Tunable Nonradiative Bath for Moiré Excitons
  title_type: original
  lang: en

## Description

- description: "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 ℓ\U0001D44B≈\U0001D467. 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."
  description_type: abstract
  lang: und

## Creator

- name: Katsunori Wakabayashi
  role: author
  orcid: https://orcid.org/0000-0002-9147-9939

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## Publisher

organization: Physical Society of Japan

## Managing organization



## Keyword

- subject: Moiré excitons
  schema: not_defined
- subject: Graphene
  schema: not_defined
- subject: Nonradiative energy transfer
  schema: not_defined
- subject: Photoluminescence quenching
  schema: not_defined
- subject: Exciton form factor
  schema: not_defined
- subject: Pauli blocking
  schema: not_defined
- subject: Transition-polarization radius
  schema: not_defined

## Rights

- description: "© 2026 The Physical Society of Japan "
  identifier: http://rightsstatements.org/vocab/InC/1.0/

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## Journal

- title: Journal of the Physical Society of Japan
  issn: '00319015'
  volume: '95'
  issue: '10'
  article_number: '104701'

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## Funding

- identifier: JP25K01609
  funder_name: Japan Society for the Promotion of Science
- identifier: JP22H05473
  funder_name: Japan Society for the Promotion of Science

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## Fileset

- id: 5884fce9-dcf0-46b4-b760-fdcb71228bda
  filename: 71972.pdf
  content_type: application/pdf
  size: 9206657
  md5: 7f6d8d128c18e05787725b92f834e99d

## Thumbnail

fileset_id: 5884fce9-dcf0-46b4-b760-fdcb71228bda
filename: 71972.pdf