Anatolie A Mitioglu

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Achieving significant doping in GaAs/AlAs core/shell nanowires (NWs) is of considerable technological importance but remains a challenge due to the amphoteric behavior of the dopant atoms. Here we show that placing a narrow GaAs quantum well in the AlAs shell effectively getters residual carbon acceptors leading to an unintentional p-type doping.(More)
Magneto-photoluminescence measurements of individual zinc-blende GaAs/AlAs core/shell nanowires are reported. At low temperature, a strong emission line at 1.507 eV is observed under low power (nW) excitation. Measurements performed in high magnetic field allowed us to detect in this emission several lines associated with excitons bound to defect pairs.(More)
Optical spectroscopy in high magnetic fields B ≤ 65 T is used to reveal the very different nature of carriers in monolayer and bulk transition metal dichalcogenides. In monolayer WSe2, the exciton emission shifts linearly with the magnetic field and exhibits a splitting that originates from the magnetic field induced valley splitting. The monolayer data can(More)
The family of organic-inorganic tri-halide perovskites including MA (MethylAmmonium)PbI3, MAPbI3-xClx, FA (FormAmidinium)PbI3 and FAPbBr3 are having a tremendous impact on the field of photovoltaic cells due to the combination of their ease of deposition and high energy conversion efficiencies. Device performance, however, is known to be still significantly(More)
A. A. Mitioglu,1,2 K. Galkowski,1 A. Surrente,1 L. Klopotowski,3 D. Dumcenco,4 A. Kis,4 D. K. Maude,1 and P. Plochocka1,* 1Laboratoire National des Champs Magnétiques Intenses, CNRS-UGA-UPS-INSA, Grenoble and Toulouse, France 2Institute of Applied Physics, Academiei Strasse 5, Chisinau, MD-2028, Republic of Moldova 3Institute of Physics, Polish Academy of(More)
Synthetic two-dimensional transition metal dichalcogenides such as, tungsten disulphide (WS<sub>2</sub>), tungsten diselenide (WSe<sub>2</sub>), molybdenum disulphide (MoS<sub>2</sub>) as well as mixed molybdenum tungsten disulphide (Mo<sub>0.5</sub>W<sub>0.5</sub>S<sub>2</sub>) single crystals were grown by the chemical vapor transport method using(More)
A rate equation model for the dark and bright excitons kinetics is proposed which explains the wide variation in the observed degree of circular polarization of the PL emission in different TMDs monolayers. Our work suggests that the dark exciton states play an important, and previously unsuspected role in determining the degree of polarization of the PL(More)
The optical properties of colloidal cesium lead halide perovskite (CsPbBr3) nanocrystals are examined by time-resolved and polarization-resolved spectroscopy in high magnetic fields up to 30 T. We unambiguously show that at cryogenic temperatures the emission is dominated by recombination of negatively charged excitons with radiative decay time of 300 ps.(More)