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Rivera, CAuthorCalleja, EAuthorFernandez-Garrido, SAuthor

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Carrier-confinement effects in nanocolumnar GaN/AlxGa1-xN quantum disks grown by molecular-beam epitaxy

Publicated to:Physical Review b. 72 (8): - 2005-08-15 72(8), DOI: 10.1103/PhysRevB.72.085330

Authors: Ristic, J; Rivera, C; Calleja, E; Fernandez-Garrido, S; Povoloskyi, M; Di Carlo, A;

Affiliations

Univ Politecn Madrid, Dept Ingn Elect, Madrid, Spain - Author
Univ Politecn Madrid, ISOM, Madrid, Spain - Author
Univ Roma Tor Vergata, Dipartimento Ingn Elettron, Rome, Italy - Author

Abstract

Carrier confinement effects in nanocolumnar AlxGa1-xN/GaN multiple quantum disks have been studied by photoluminescence, as a function of the Al content and quantum disk thickness. Experimental emission energies are compared to theoretical calculations based on a one-dimensional Schrodinger-Poisson solver, including spontaneous and piezoelectric polarizations, surface potentials, and strain. An inhomogeneous biaxial (in-plane) strain distribution within the GaN quantum disks, pseudomorphically grown on strain-free AlxGa1-xN nanocolumns, results from a reduction of the accumulated elastic energy at the disk free surface (GaN-air boundary). This strain reduction annihilates partially the piezoelectric field, giving rise to a specific carrier confinement mechanism (strain confinement), that depends on the disk thickness. This strain confinement mechanism is the origin of the luminescence quenching in very thin GaN quantum disks, as well as the main source of the emission linewidth broadening.

Keywords

FieldsGan nanocolumnsNitridesOptical-propertiesWellsWidth dependence

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Physical Review b 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, 2005, it was in position 7/60, thus managing to position itself as a Q1 (Primer Cuartil), in the category Physics, Condensed Matter.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 12.43, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions Jun 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-06-14, the following number of citations:

  • WoS: 54
  • Scopus: 58

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 2025-06-14:

  • 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: 52 (PlumX).

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 (Ristic, J) .

the author responsible for correspondence tasks has been Ristic, J.