Kurzhals, Philipp Kremer, Geoffroy Jaouen, Thomas Nicholson, Christopher W. Heid, Rolf Nagel, Peter Castellan, John-Paul Ivanov, Alexandre Muntwiler, Matthias Rumo, Maxime
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Published in
Nature Communications
Phonon anomalies are commonly attributed to Fermi-surface nesting or phonon anharmonicity, but these mechanisms do not apply in all cases. Here, the authors propose a new mechanism based on electron-momentum-dependent electron-phonon coupling in the case of YNi2B2C, that could also apply to other materials.
Gorelov, Vitaly Reining, Lucia Feneberg, Martin Goldhahn, Rüdiger Schleife, André Lambrecht, Walter R. L. Gatti, Matteo
The simplest picture of excitons in materials with atomic-like localization of electrons is that of Frenkel excitons, where electrons and holes stay close together, which is associated with a large binding energy. Here, using the example of the layered oxide V$_2$O$_5$ , we show how localized charge-transfer excitations combine to form excitons tha...
Gao, Lan Nefzaoui, Elyes Marty, Frédéric Wei, Xueyong Bastide, Stéphane Leprince-Wang, Yamin Bourouina, TARIK
International audience
Purushottam Raj Purohit, Ravi Raj Purohi... Tardif, Samuel Castelnau, Olivier Eymery, Joel Guinebretière, René Robach, Odile Ors, Taylan Micha, Jean-Sébastien
A feed-forward neural-network-based model is presented to index, in real time, the diffraction spots recorded during synchrotron X-ray Laue microdiffraction experiments. Data dimensionality reduction is applied to extract physical 1D features from the 2D X-ray diffraction Laue images, thereby making it possible to train a neural network on the fly ...
Hodille, E A Byggmästar, J Ferro, Y Nordlund, K
Published in
Journal of Physics: Condensed Matter
Molecular dynamics simulations are used to investigate the behaviour of D atoms at two interfaces between beryllium (Be) and beryllium oxide (BeO). After relaxation of the simulation cell, there are (a) localised defects at the interface and (b) a hexagonal misfit dislocation network creating a succession of compressed and expanded area from each s...
Petit, Antoine Pokam, Sylvia Mazen, Frederic Tardif, Samuel Landru, Didier Kononchuk, Oleg Ben Mohamed, Nadia Olbinado, Margie Rack, Alexander Rieutord, Francois
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In situ investigations of cracks propagating at up to 2.5 km s −1 along an (001) plane of a silicon single crystal are reported, using X-ray diffraction megahertz imaging with intense and time-structured synchrotron radiation. The studied system is based on the Smart Cut process, where a buried layer in a material (typically Si) is weakened by micr...
Engelhardt, Fabian Bittencourt, Victor A. S. V. Huebl, Hans Klein, Olivier Kusminskiy, Silvia Viola
Developing schemes for efficient and broad-band frequency conversion of quantum signals is an ongoing challenge in the field of modern quantum information. Especially the coherent conversion between microwave and optical signals is an important milestone towards long-distance quantum communication. In this work, we propose a two-stage conversion pr...
Montiel, Antoine Nguyen, Thuy Rountree, Cindy Geertsen, Valérie Guenoun, Patrick Bonamy, Daniel
We examine how disordering joint position influences the linear elastic behavior of lattice materials via numerical simulations in two-dimensional beam networks. Three distinct initial crystalline geometries are selected as representative of mechanically isotropic materials low connectivity, mechanically isotropic materials with high connectivity, ...
Testa, Luc Babkevich, Peter Kato, Yasuyuki Kimura, Kenta Favre, Virgile Rodriguez-Rivera, Jose A. Ollivier, Jacques Raymond, Stéphane Kimura, Tsuyoshi Motome, Yukitoshi
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We report high-resolution single-crystal inelastic neutron scattering measurements on the spin-1/2 antiferromagnet Ba(TiO)Cu$_4$(PO$_4$)$_4$. This material is formed from layers of four-site \cupola" structures, oriented alternately upwards and downwards, which constitute a rather special realization of two-dimensional (2D) square-lattice magnetism...
Lu, Qingqing Eid, Kamel Li, Wenpeng
Published in
Nanomaterials (Basel, Switzerland)
The continual rise of the CO2 concentration in the Earth's atmosphere is the foremost reason for environmental concerns such as global warming, ocean acidification, rising sea levels, and the extinction of various species. The electrochemical CO2 reduction (CO2RR) is a promising green and efficient approach for converting CO2 to high-value-added pr...