Strain fingerprinting of exciton valley character in 2D semiconductors

Autor: Abhijeet M. Kumar, Denis Yagodkin, Roberto Rosati, Douglas J. Bock, Christoph Schattauer, Sarah Tobisch, Joakim Hagel, Bianca Höfer, Jan N. Kirchhof, Pablo Hernández López, Kenneth Burfeindt, Sebastian Heeg, Cornelius Gahl, Florian Libisch, Ermin Malic, Kirill I. Bolotin

Publikováno v: Nature Communications, Vol 15, Iss 1, Pp 1-8 (2024)

Abstract Intervalley excitons with electron and hole wavefunctions residing in different valleys determine the long-range transport and dynamics observed in many semiconductors. However, these excitons with vanishing oscillator strength do not direct

Externí odkaz: https://doaj.org/article/8bdb511c5a7748e3bcc5df43a7866d52

Strain control of hybridization between dark and localized excitons in a 2D semiconductor

Autor: Pablo Hernández López, Sebastian Heeg, Christoph Schattauer, Sviatoslav Kovalchuk, Abhijeet Kumar, Douglas J. Bock, Jan N. Kirchhof, Bianca Höfer, Kyrylo Greben, Denis Yagodkin, Lukas Linhart, Florian Libisch, Kirill I. Bolotin

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-9 (2022)

Mechanical strain is a powerful tuning knob for excitons in two-dimensional semiconductors. Here, the authors find that under the application of strain, dark and localized excitons in monolayer WSe2 are brought into energetic resonance, forming a new

Externí odkaz: https://doaj.org/article/e0d2854796d04ac8829185d361ea9b87

Fabrication and electrochemical response of pristine graphene ultramicroelectrodes

Autor: Ernie W. Hill, Bruce Grieve, Stefan Goodwin, Zachary Coldrick, Aravind Vijayaraghavan, Sebastian Heeg

Publikováno v: Goodwin, S, Coldrick, Z, Heeg, S, Grieve, B, Vijayaraghavan, A & Hill, E W 2021, ' Fabrication and electrochemical response of pristine graphene ultramicroelectrodes ', Carbon, vol. 177, pp. 207-215 . https://doi.org/DOI: 10.1016/j.carbon.2021.02.078
University of Manchester-PURE

Ultramicroelectrodes (UMEs) are electrochemical working electrodes with at least one dimension less than 25 μm. Here, we demonstrate a method to fabricate pristine (contamination and doping-free) monolayer graphene UMEs and characterise its electroc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2e2cb7ec96276e07c090d9dde23b37c2
https://doi.org/10.1016/j.carbon.2021.02.078

Raman Scattering Cross Section of Confined Carbyne

Autor: Lei Shi, Thomas Pichler, Lukas Novotny, Martin Frimmer, Sebastian Heeg, Cla Duri Tschannen, Stephanie Reich, Georgy Gordeev

Publikováno v: Nano Letters, 20 (9)

We experimentally quantify the Raman scattering from individual carbyne chains confined in double-walled carbon nanotubes. We find that the resonant differential Raman cross section of confined carbyne is on the order of 10−22 cm2 sr−1 per atom,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aeb76e9c37f5749386d5208f25ad0f22
https://doi.org/10.1021/acs.nanolett.0c02632

Anti-Stokes Raman Scattering of Single Carbyne Chains

Autor: Cla Duri, Tschannen, Martin, Frimmer, Georgy, Gordeev, Thiago L, Vasconcelos, Lei, Shi, Thomas, Pichler, Stephanie, Reich, Sebastian, Heeg, Lukas, Novotny

Publikováno v: ACS nano. 15(7)

We investigate the anti-Stokes Raman scattering of single carbyne chains confined inside double-walled carbon nanotubes. Individual chains are identified using tip-enhanced Raman scattering (TERS) and heated by resonant excitation with varying laser

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::5a9594a06d5ca9ca5474414b75a1d155
https://pubmed.ncbi.nlm.nih.gov/34254777