Karol Nogajewski
Centre national de la recherche scientifique
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Publication
Featured researches published by Karol Nogajewski.
Nature Nanotechnology | 2015
M. Koperski; Karol Nogajewski; Ashish Arora; V. Cherkez; P. Mallet; J.-Y. Veuillen; J. Marcus; P. Kossacki; M. Potemski
Crystal structure imperfections in solids often act as efficient carrier trapping centres, which, when suitably isolated, act as sources of single photon emission. The best known examples of such attractive imperfections are well-width or composition fluctuations in semiconductor heterostructures (resulting in the formation of quantum dots) and coloured centres in wide-bandgap materials such as diamond. In the recently investigated thin films of layered compounds, the crystal imperfections may logically be expected to appear at the edges of commonly investigated few-layer flakes of these materials exfoliated on alien substrates. Here, we report comprehensive optical micro-spectroscopy studies of thin layers of tungsten diselenide (WSe2), a representative semiconducting dichalcogenide with a bandgap in the visible spectral range. At the edges of WSe2 flakes (transferred onto Si/SiO2 substrates) we discover centres that, at low temperatures, give rise to sharp emission lines (100 μeV linewidth). These narrow emission lines reveal the effect of photon antibunching, the unambiguous attribute of single photon emitters. The optical response of these emitters is inherently linked to the two-dimensional properties of the WSe2 monolayer, as they both give rise to luminescence in the same energy range, have nearly identical excitation spectra and have very similar, characteristically large Zeeman effects. With advances in the structural control of edge imperfections, thin films of WSe2 may provide added functionalities that are relevant for the domain of quantum optoelectronics.
arXiv: Mesoscale and Nanoscale Physics | 2017
Maciej R. Molas; C. Faugeras; A. O. Slobodeniuk; Karol Nogajewski; Miroslav Bartos; D. M. Basko; M. Potemski
We present low temperature magneto-photoluminescence experiments which demonstrate the brightening of dark excitons by an in-plane magnetic field
Physical Review Letters | 2015
C. Faugeras; Stéphane Berciaud; P. Leszczynski; Y. Henni; Karol Nogajewski; M. Orlita; T. Taniguchi; Kenji Watanabe; Carlos Forsythe; Philip Kim; R. Jalil; A. K. Geim; D. M. Basko; M. Potemski
B
Nanoscale | 2015
Ashish Arora; Karol Nogajewski; Maciej R. Molas; M. Koperski; M. Potemski
applied to monolayers of different semiconducting transition metal dichalcogenides. For both WSe
Nano Letters | 2016
Tomasz Jakubczyk; Valentin Delmonte; M. Koperski; Karol Nogajewski; C. Faugeras; Wolfgang Werner Langbein; M. Potemski; Jacek Kasprzak
_2
Nanophotonics | 2017
M. Koperski; Maciej R. Molas; Ashish Arora; Karol Nogajewski; A. O. Slobodeniuk; C. Faugeras; M. Potemski
and WS
arXiv: Materials Science | 2016
M. Grzeszczyk; K. Gołasa; M. Zinkiewicz; Karol Nogajewski; Maciej R. Molas; M. Potemski; A. Wysmołek; A. Babiński
_2
Nano Letters | 2016
Younes Henni; Hector Pablo Ojeda Collado; Karol Nogajewski; Maciej R. Molas; Gonzalo Usaj; C. A. Balseiro; M. Orlita; M. Potemski; C. Faugeras
monolayers, the dark exciton emission is observed at
Nanoscale | 2017
Maciej R. Molas; Karol Nogajewski; A. O. Slobodeniuk; J. Binder; Miroslav Bartos; M. Potemski
\sim
Nano Letters | 2017
J. Binder; Freddie Withers; Maciej R. Molas; C. Faugeras; Karol Nogajewski; Kenji Watanabe; Takashi Taniguchi; Aleksey Kozikov; A. K. Geim; K. S. Novoselov; M. Potemski
50 meV below the bright exciton peak and displays a characteristic doublet structure which intensity is growing with