# Electrical spectroscopy of intervalley relaxation in                    <math>                      <msub>                        <mi>WSe</mi>                        <mn>2</mn>                      </msub>                    </math>                    transistors

https://mdr.nims.go.jp/datasets/412d9a2d-b7bc-4baf-aeb3-bf187d24b60b

## File

- [main.pdf](https://mdr.nims.go.jp/filesets/dad82eae-3455-47ee-a1dc-107ddbffd4fe/download) ([Detail](https://mdr.nims.go.jp/filesets/dad82eae-3455-47ee-a1dc-107ddbffd4fe.md))

## Id

412d9a2d-b7bc-4baf-aeb3-bf187d24b60b

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-08-31T00:56:25.634169Z

## Updated at

2026-08-31T01:59:17.498672Z

## Published at

2026-08-31T03:26:11.979680Z

## Doi

https://doi.org/10.48505/nims.6491

## First published url

https://doi.org/10.1103/p8mx-dr9j

## Date published

2026-08-28

## Recorded date published

2026-8

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: |-
    Electrical spectroscopy of intervalley relaxation in
                        <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
                          <mml:msub>
                            <mml:mi>WSe</mml:mi>
                            <mml:mn>2</mml:mn>
                          </mml:msub>
                        </mml:math>
                        transistors
  title_type: original
  lang: en

## Description

- description: "We show that the transconductance of multilayer WSe<sub>2</sub> field-effect
    transistors serves as a direct electrical spectrometer of the intervalley relaxation
    time τ<sub>iv</sub>, previously accessible only by ultrafast optical techniques.
    Extending an equilibrium valley-thermodynamics framework with a single relaxation
    equation for the Γ-valley carrier fraction f<sub>Γ</sub>(t), we predict three
    signatures: (i) a Lorentzian transconductance g<sub>m</sub>(ω) = g<sub>m,0</sub>
    + g<sup>0</sup><sub>m,v</sub>/(1 + iωτ<sub>iv</sub>), whose imaginary part peaks
    at ω<sub>c</sub> = τ<sub>iv</sub><sup>−1</sup> with opposite signs for bilayer
    and trilayer; (ii) a two-stage current transient after a gate step, exhibiting
    bilayer overshoot or trilayer undershoot; and (iii) sweep-rate-proportional hysteresis
    whose gate-voltage profile and layer-number sign reversal distinguish valley from
    trap-induced dynamics. All three signatures provide quantitative electrical access
    to τ<sub>iv</sub> with standard rf and dc instrumentation.\r\n\r\n"
  description_type: abstract
  lang: und

## Creator

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

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Intervalley relaxation
  schema: not_defined
- subject: Valley dynamics
  schema: not_defined
- subject: Valleytronics
  schema: not_defined
- subject: Multilayer WSe2
  schema: not_defined
- subject: Two-dimensional semiconductors
  schema: not_defined
- subject: Transconductance spectroscopy
  schema: not_defined
- subject: Field-effect transistors
  schema: not_defined

## Rights

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

## Other identifier(s)



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## Embargo



## Journal

- title: Physical Review B
  issn: '24699950'
  volume: '114'
  issue: '10'
  article_number: '105421'

## Conference



## Related item



## Funding

- identifier: JP25K01609
  funder_name: Japan Society for the Promotion of Science
- identifier: JP22H05473
  funder_name: Japan Society for the Promotion of Science
- identifier: JP21H01019
  funder_name: Japan Society for the Promotion of Science
- identifier: JPMJCR19T1
  funder_name: Japan Science and Technology Agency
- identifier: '2401203'
  funder_name: Sumitomo Foundation

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## Fileset

- id: dad82eae-3455-47ee-a1dc-107ddbffd4fe
  filename: main.pdf
  content_type: application/pdf
  size: 5076270
  md5: d3cbd00490b1527bbe6aa5f89505b44a

## Thumbnail

fileset_id: dad82eae-3455-47ee-a1dc-107ddbffd4fe
filename: main.pdf