Pinning and gyration dynamics of magnetic vortices revealed by correlative Lorentz and bright-field imaging

Autor: Marcel Möller, John H. Gaida, Claus Ropers

Publikováno v: Physical Review Research, Vol 4, Iss 1, p 013027 (2022)

Topological magnetic textures are of great interest in various scientific and technological fields. To allow for precise control of nanoscale magnetism, it is of great importance to understand the role of intrinsic defects in the host material. Here

Externí odkaz: https://doaj.org/article/04f2199ade724014ab9abf546bd09c13

Defocus Phase Contrast in Photon-Induced Near-field Electron Microscopy

Autor: John H Gaida, Hugo Lourenco-Martins, Sergey V Yalunin, Armin Feist, Murat Sivis, Thorsten Hohage, F Javier García de Abajo, Claus Ropers

Publikováno v: The International Conference on Ultrafast Phenomena (UP) 2022.

We demonstrate optical phase contrast in near-field imaging of metallic nanostructures using a new combination of inelastic electron-light scattering with Fresnel-mode Lorentz microscopy.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ba9ad53d55f498f90c022f4b250c3e6
https://doi.org/10.1364/up.2022.m3a.2

Observation of fluctuation mediated picosecond nucleation of a topological phase

Autor: Bertrand Dupé, Kai Bagschik, Felix Büttner, Rafael Gort, M. Porro, Andrey Samartsev, Laurent Mercadier, Clemens von Korff Schmising, J.H. Mentink, Ivan Lemesh, Stefan Eisebitt, G. Mercurio, Alexander Yaroslavtsev, Jun Zhu, S. Maffessanti, Mantao Huang, Lucas Caretta, Kathinka Gerlinger, Bastian Pfau, Claus Ropers, Christopher Klose, Loïc Le Guyarder, Robert Carley, Tyler R. Harvey, Angela Wittmann, A. Scherz, David Weder, Alexandra Churikova, Piet Hessing, Christian Strüber, Geoffrey S. D. Beach, F. Erdinger, Dieter Engel, Andrea Castoldi, David Hickin, Jairo Sinova, Marie Böttcher, Sergey Zayko, Marcel Möller, Lisa-Marie Kern, Josefin Fuchs, Daniel Suzuki, Christian M. Günther, Michael Schneider, Natalia Gerasimova, Monica Turcato, Carsten Deiter, Siying Huang, John H. Gaida, David Lomidze, J. Schlappa

Publikováno v: Nature materials 20, 30-37 (2021). doi:10.1038/s41563-020-00807-1
Nature Materials, 20, pp. 30-37
Nature Materials, 20, 30-37

Nature materials 20, 30 - 37 (2021). doi:10.1038/s41563-020-00807-1
Topological states of matter exhibit fascinating physics combined with an intrinsic stability. A key challenge is the fast creation of topological phases, which requires massive

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8dcb8518225422e9dc9421cfe91b5442
http://www.helmholtz-berlin.de/pubbin/oai_publication?VT=1&ID=105209

Time- and frequency-resolved fluorescence with a single TCSPC detector via a Fourier-transform approach

Autor: Dario Polli, Antonio Perri, Andrea Farina, Cosimo D'Andrea, Matteo Ballottari, Sandro De Silvestri, Giulio Cerullo, Daniele Viola, Fabrizio Preda, Jürgen Hauer, John H. Gaida

Publikováno v: Optics express
Optics Express
Optics express 26 (2018): 2270–2279. doi:10.1364/OE.26.002270
info:cnr-pdr/source/autori:Perri, Antonio; Gaida, John H.; Farina, Andrea; Preda, Fabrizio; Viola, Daniele; Ballottari, Matteo; Hauer, Jürgen; ; De Silvestri, Sandro; D'Andrea, Cosimo; Cerullo, Giulio; Polli, Dario/titolo:Time-and frequency-resolved fluorescence with a single TCSPC detector via a Fourier-transform approach/doi:10.1364%2FOE.26.002270/rivista:Optics express/anno:2018/pagina_da:2270/pagina_a:2279/intervallo_pagine:2270–2279/volume:26

We introduce a broadband single-pixel spectro-temporal fluorescence detector, combining time-correlated single photon counting (TCSPC) with Fourier transform (FT) spectroscopy. A birefringent common-path interferometer (CPI) generates two time-delaye

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6ba87eecf030ec05dfb0d31134392b2e
http://europepmc.org/articles/PMC6186413

Ultrafast sublattice pseudospin relaxation in graphene probed by polarization-resolved photoluminescence

Autor: Thomas Danz, Claus Ropers, Reiner Bormann, Andreas Neff, John H. Gaida, Sascha Schäfer

Publikováno v: Physical Review B

Electronic pseudospin degrees of freedom in two-dimensional materials exhibit unique carrier-field interactions which allow for advanced control strategies. Here, we investigate ultrafast sublattice pseudospin relaxation in graphene by means of polar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51ee9842d0f32dcdc506720d7ed68e4a
https://doi.org/10.1103/physrevb.95.241412