Cana Elgvin

• Elgvin, Cana; Hage, Fredrik Sydow; Prytz, Øystein; Elyas, Khairi; Höflich, Katja & Koch, Christoph T. [Show all 7 contributors for this article] (2026). Advances in momentum-resolved EELS of phonons, excitons and plasmons in 2D materials and their heterostructures. PHYSICAL REVIEW MATERIALS. 10. doi: 10.1103/8wwb-lxk2. Full text in Research Archive Show summary

  Momentum-resolved electron energy-loss spectroscopy (q-EELS) enables the study of 2D materials by simultaneously capturing energy and momentum transfer with nanometer spatial resolution, probing excitations beyond the light cone and outside the first Brillouin zone. This technique provides unrivaled detail in the investigation of plasmons, excitons, phonons, and their coupling in 2D materials and across interfaces in heterostructures. This review covers the fundamentals of q-EELS, including resolution limits and detectability challenges. Current applications in graphene, hexagonal boron nitride, and transition metal dichalcogenides are surveyed. Emerging frontiers including magnons, cryogenic operation, and in situ capabilities promise to advance our understanding of low-dimensional materials.

• Valido, Dario Alejandro Leon; Elgvin, Cana; Nguyen, Phuong Dan; Prytz, Øystein; Hage, Fredrik Sydow & Berland, Kristian (2024). Unraveling many-body effects in ZnO: Combined study using momentum-resolved electron energy-loss spectroscopy and first-principles calculations. Physical review B (PRB). ISSN 2469-9950. 109(11). doi: 10.1103/PhysRevB.109.115153. Full text in Research Archive Show summary

  We present a detailed study of the dielectric response of ZnO using a combination of low-loss momentum- resolved electron energy-loss spectroscopy (EELS) and first-principles calculations at several levels of theory, from the independent particle and the random phase approximation with different variants of density functional theory (DFT), including hybrid and DFT + U schemes; to the Bethe-Salpeter equation (BSE). We use a method based on the f -sum rule to obtain the momentum-resolved experimental loss function and absorption spectra from EELS measurements. We characterize the main features in the direct and inverse dielectric functions of ZnO and their dispersion, associating them to single-particle features in the electronic band structure, while highlighting the important role of many-body effects such as plasmons and excitons. We discuss different signatures of the high anisotropy in the response function of ZnO, including the symmetry of the excitonic wave functions.

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• Elgvin, Cana; Leon, Dario A.; Hage, Fredrik Sydow; Nguyen, Phuong Dan; Berland, Kristian & Prytz, Øystein (2023). The effects of heavy doping on the band structure of zinc oxide obѕerνed using momentum-resolved EELS. Full text in Research Archive
• Elgvin, Cana; Leon, Dario A.; Hage, Fredrik Sydow; Nguyen, Phuong Dan; Berland, Kristian & Prytz, Øystein (2023). Anisotropy and nature of electronic excitations using ωq-mapping and ab initio calculations. Full text in Research Archive
• Elgvin, Cana; Kjeldby, Snorre Braathen; Both, Kevin Gregor; Nguyen, Phuong Dan & Prytz, Øystein (2022). Optical Properties of Zinc Ferrite Nanoparticles Embedded in Zinc Oxide Thin Films Investigated by STEM, EELS and CL. Full text in Research Archive
• Jones, Ella Randmæl; Prytz, Øystein; Vines, Lasse; Elgvin, Cana & Both, Kevin Gregor (2024). Pulsed laser deposition synthesis of ZnFe2O4 nanostructures embedded in a ZnO thin film for tandem solar cells. University of Oslo, Department of Physics. Full text in Research Archive
• Elgvin, Cana & Prytz, Øystein (2021). Characterization and optical properties of ZnFe2O4 nanoparticles in ZnO thin films - A (S)TEM study. Universitetet i Oslo. Full text in Research Archive

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