David Lagarde
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View article: Charge State Tuning of Spin Defects in Hexagonal Boron Nitride
Charge State Tuning of Spin Defects in Hexagonal Boron Nitride Open
Boron vacancies in hexagonal boron nitride (hBN) are among the most extensively studied optically active spin defects in van der Waals crystals, due to their promising potential to develop two-dimensional (2D) quantum sensors. In this lett…
View article: Spin-valley polarization control in WSe$_2$ monolayers using photochemical doping
Spin-valley polarization control in WSe$_2$ monolayers using photochemical doping Open
We report on the influence of a photochemical doping method on the spin-valley polarization degree ($P_{c}$) of excitons in WSe$_2$ monolayers. By varying the carrier density and transitioning from an excess of electrons (n-type) to an exc…
View article: Non-linear diffusion of negatively charged excitons in WSe2 monolayer
Non-linear diffusion of negatively charged excitons in WSe2 monolayer Open
We investigate the diffusion process of negatively charged excitons (trions) in WSe2 transition metal dichalcogenide monolayer. We measure time-resolved photoluminescence spatial profiles of these excitonic complexes which exhibit a non-li…
View article: From the Middle-East Refuge to the Global Flight. Structural Organization of the Syrian Exodus between 2011 and 2016
From the Middle-East Refuge to the Global Flight. Structural Organization of the Syrian Exodus between 2011 and 2016 Open
International audience
View article: Control of the Exciton Radiative Lifetime in van der Waals Heterostructures
Control of the Exciton Radiative Lifetime in van der Waals Heterostructures Open
Optical properties of atomically thin transition metal dichalcogenides are controlled by robust excitons characterized by a very large oscillator strengths. Encapsulation of monolayers such as MoSe_{2} in hexagonal boron nitride (hBN) yiel…
View article: Syrian street vendors and globalisation
Syrian street vendors and globalisation Open
By studying the mobility of Syrian peddlers, this article aims to highlight the adaptability of a rural community subject to the vicissitudes of geopolitical crises in the Middle East. Their history, the regular reconfigurations of their t…
View article: Bismuth content dependence of the electron spin relaxation time in GaAsBi epilayers and quantum well structures
Bismuth content dependence of the electron spin relaxation time in GaAsBi epilayers and quantum well structures Open
International audience
View article: In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
In-Plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules Open
The optical selection rules for interband transitions in WSe_{2}, WS_{2}, and MoSe_{2} transition metal dichalcogenide monolayers are investigated by polarization-resolved photoluminescence experiments with a signal collection from the sam…
View article: Spin and recombination dynamics of excitons and free electrons in p-type GaAs: Effect of carrier density
Spin and recombination dynamics of excitons and free electrons in p-type GaAs: Effect of carrier density Open
Carrier and spin recombination are investigated in p-type GaAs of acceptor concentration NA = 1.5 × 1017 cm−3 using time-resolved photoluminescence spectroscopy at 15 K. At low photocarrier concentration, acceptors are mostly neutral and p…
View article: Syrian refugees' journey from Jordan to Germany
Syrian refugees' journey from Jordan to Germany Open
This field report is part of a project of doctoral research into the networks and dynamics of Syrian exile to Jordan. This research is based on longitudinal monitoring of an ordinary group of refugees from Deir Mqaren – a village in the Ri…