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pro vyhledávání: '"Sponza, Lorenzo"'
We investigate the electronic structure and the optical absorption onset of close-to-30\degree twisted hexagonal boron nitride bilayers. Our study is carried out with a purposely developed tight-binding model validated against DFT simulations. We dem
Externí odkaz:
http://arxiv.org/abs/2310.02937
Autor:
Zanfrognini, Matteo, Plaud, Alexandre, Stenger, Ingrid, Fossard, Frédéric, Sponza, Lorenzo, Schué, Léonard, Paleari, Fulvio, Molinari, Elisa, Varsano, Daniele, Wirtz, Ludger, Ducastelle, François, Loiseau, Annick, Barjon, Julien
Despite its simple crystal structure, layered boron nitride features a surprisingly complex variety of phonon-assisted luminescence peaks. We present a combined experimental and theoretical study on ultraviolet-light emission in hexagonal and rhomboh
Externí odkaz:
http://arxiv.org/abs/2305.17554
Many are the ways of engineering the band gap of nanoribbons including application of stress, electric field and functionalization of the edges. In this article, we investigate separately the effects of these methods on armchair graphene and boron ni
Externí odkaz:
http://arxiv.org/abs/2302.14432
Autor:
Carré, Etienne, Sponza, Lorenzo, Lusson, Alain, Stenger, Ingrid, Roux, Sébastien, Zatko, Victor, Dlubak, Bruno, Seneor, Pierre, Gaufrès, Etienne, Loiseau, Annick, Barjon, Julien
Black phosphorus (BP) stands out from other 2D materials by the wide amplitude of the band-gap energy (Delta(Eg)) that sweeps an optical window from Visible (VIS) to Infrared (IR) wavelengths, depending on the layer thickness. This singularity made t
Externí odkaz:
http://arxiv.org/abs/2212.01073
Publikováno v:
SciPost Phys. 14, 053 (2023)
Since the discovery of superconductive twisted bilayer graphene which initiated the field of twistronics, moir\'e systems have not ceased to exhibit fascinating properties. We demonstrate that in boron nitride twisted bilayers, for a given moir\'e pe
Externí odkaz:
http://arxiv.org/abs/2206.05845
Autor:
Roux, Sébastien, Arnold, Christophe, Paleari, Fulvio, Sponza, Lorenzo, Janzen, Eli, Edgar, James H., Toury, Bérangère, Journet, Catherine, Garnier, Vincent, Steyer, Philippe, Taniguchi, Takashi, Watanabe, Kenji, Ducastelle, François, Loiseau, Annick, Barjon, Julien
Using a new time-resolved cathodoluminescence system dedicated to the UV spectral range, we present a first estimate of the radiative lifetime of free excitons in hBN at room temperature. This is carried out from a single experiment giving both the a
Externí odkaz:
http://arxiv.org/abs/2107.00989
Autor:
Sponza, Lorenzo, Ducastelle, François
In this paper we derive a formalism allowing us to separate inter-layer contributions to the polarizability of a periodic array of 2D materials from intra-layer ones. To this aim, effective profile functions are introduced. They constitute a tight-bi
Externí odkaz:
http://arxiv.org/abs/2011.07811
Autor:
Carré, Etienne, Sponza, Lorenzo, Lusson, Alain, Stenger, Ingrid, Gaufrès, Etienne, Loiseau, Annick, Barjon, Julien
Atomic layers of Black Phosphorus (BP) present unique opto-electronic properties dominated by a direct tunable bandgap in a wide spectral range from visible to mid-infrared. In this work, we investigate the infrared photoluminescence of BP single cry
Externí odkaz:
http://arxiv.org/abs/2010.15449
Publikováno v:
Phys. Rev. B 102, 035415 (2020)
We study the mechanical and electronic properties of heterobilayers composed of black phosphorus (BP) on hexagonal boron nitride (hBN) and of blue phosphorus (\Pblue) on hBN by means of ab-intio density functional theory. Emphasis is put on how the s
Externí odkaz:
http://arxiv.org/abs/2004.03313
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