Two-dimensional molybdenum disulfide (MoS2) is a promising material for optoelectronic
devices due to its strong photoluminescence emission. In this work, the photoluminescence …

Raman scattering and photoluminescence (PL) emission are used to investigate a single
layer of tungsten disulfide (WS 2) obtained by exfoliating n-type bulk crystals. Direct gap …

Transition-metal dichalcogenides can be easily produced as atomically thin sheets,
exhibiting the possibility to optically polarize and read out the valley pseudospin of …

We present a comprehensive examination of optical pum** of spins in individual GaAs
quantum dots as we change the net charge from positive to neutral to negative with a charge …

Coulomb interactions are crucial in determining the ground state of an ideal two-
dimensional electron gas (2DEG) in the limit of low electron densities. In this regime …

We present an analysis of time-and polarization-resolved data taken in
microphotoluminescence experiments on individual CdSe/ZnSe quantum dots grown by …

The emission and absorption spectra of quantum wells containing electron or hole gas are
reviewed. We show that trions, also known as charged excitons, play a dominant role in …

We report the observation of the positively charged exciton and of the triplet state of the
negatively charged exciton in modulation doped GaAs quantum wells. Applying a gate …

Embedding a WS 2 monolayer in flakes of hexagonal boron nitride allowed us to resolve
and study the photoluminescence response due to both singlet and triplet states of …

A brief review is given of optical studies of doped II–VI quantum wells. The properties of
exciton states, neutral as well as positively and negatively charged, are discussed. A wide …