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Analysis of institutional authors

Al Taleb, AmjadAuthorFarias, DanielCorresponding Author

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March 24, 2025
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Electron-Phonon Coupling and Phonon Dynamics in Single-Layer NbSe2 on Graphene: The Role of Moire Phonons

Publicated to: Acs Nano. 19 (9): 8895-8903 - 2025-02-26 19(9), DOI: 10.1021/acsnano.4c16399

Authors:

Al Taleb, A; Wan, W; Benedek, G; Ugeda, MM; Farías, D
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Affiliations

Basque Fdn Sci, Ikerbasque, Bilbao 48013, Spain - Author
Ctr Fis Mat, San Sebastian 20018, Spain - Author
Donostia Int Phys Ctr, San Sebastian 20018, Spain - Author
Univ Autonoma Madrid, Condensed Matter Phys Ctr IFIMAC, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Dept Fis Mat Condensada, Madrid 28049, Spain - Author
Univ Autonoma Madrid, Inst Nicolas Cabrera, Madrid 28049, Spain - Author
Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy - Author
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Abstract

The interplay between substrate interactions and electron-phonon coupling in two-dimensional (2D) materials presents a significant challenge in understanding and controlling their electronic properties. Here, we present a comparative study of the structural characteristics, phonon dynamics, and electron-phonon interactions in bulk and monolayer NbSe2 on epitaxial bilayer graphene (BLG) using helium atom scattering (HAS). High-resolution helium diffraction reveals a (9 x 9)0 degrees superstructure within the NbSe2 monolayer, commensurate with the BLG lattice, while out-of-plane HAS diffraction spectra indicate a low-corrugated (3 root 3 x 3 root 3)30 degrees substructure. By monitoring the thermal attenuation of the specular peak across a temperature range of 100 to 300 K, we determined the electron-phonon coupling constant (lambda(HAS)) as 0.76 for bulk 2H-NbSe2. In contrast, the NbSe2 monolayer on graphene exhibits a reduced lambda(HAS) of 0.55, corresponding to a superconducting critical temperature (T-C) of 1.56 K according to the MacMillan formula, consistent with transport measurement findings. Inelastic HAS data provide, besides a set of dispersion curves of acoustic and lower optical phonons, a soft, dispersionless branch of phonons at 1.7 meV, attributed to the interface localized defects distributed with the superstructure period, thus termed Moir & eacute; phonons. Our data show that Moir & eacute; phonons contribute significantly to the electron-phonon coupling in monolayer NbSe2. These results highlight the crucial role of the BLG in the electron-phonon coupling in monolayer NbSe2, attributed to enhanced charge transfer effects, providing valuable insights into substrate-dependent electronic interactions in 2D superconductors.
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Keywords

ConstanElectron-phonon couplingElectron−phonon couplingGrapheneMoire structurMoiré structureMoirestructurNbse 2Nbse2PhononsSuperconductivitySuperconductorWork function

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal ACS Nano due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2025, it was in position 28/461, thus managing to position itself as a Q1 (Primer Cuartil), in the category Materials Science, Multidisciplinary. Notably, the journal is positioned above the 90th percentile.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2026-04-06:

  • WoS: 4
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Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-06:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 6.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 6 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 11.
  • The number of mentions on the social network X (formerly Twitter): 5 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://repositorio.uam.es/handle/10486/720104
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Italy.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (AL TALEB ALFAOURI, AMJAD) and Last Author (FARIAS TEJERINA, DANIEL).

the author responsible for correspondence tasks has been FARIAS TEJERINA, DANIEL.

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Awards linked to the item

This work has been partially supported by the Spanish Ministerio de Ciencia e Innovacion under projects PID2019-109525RB-I00 and PID2023-147466OB-C21. D.F. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness, through the "Maria de Maeztu" Programme for Units of Excellence in R&D (CEX2018-000805-M). M.M.U. acknowledges support by the ERC Starting grant LINKSPM (Grant 758558) and by grant PID2023-153277NB-I00 funded by the Spanish Ministry of Science, Innovation and Universities.
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