Baoli Liu

TL;DR: It is shown, using first principles calculations, that monolayer molybdenum disulphide is an ideal material for valleytronics, for which valley polarization is achievable via valley-selective circular dichroism arising from its unique symmetry.

TL;DR: The excitation power dependences of the PL peak energy and linewidth indicate that the emission process of the MQWs is dominated first by the Coulomb screening effect and then by the localized states filling at low temperature, and that the nonradiative centers are thermally activated in low excitation range at room temperature.

TL;DR: In this paper, the authors demonstrate the control of the exciton valley coherence in monolayer WSe 2 by tuning the applied magnetic field perpendicular to the monolayers plane, and show rotation of this coherent superposition of valley states by angles as large as 30° in applied fields up to 9 T.

TL;DR: In this article, the long-range exchange interaction between an electron and a hole in the exciton is demonstrated to be an efficient mechanism for rapid mixing between bright excitons made of electron-hole pairs in different valleys.

TL;DR: It is demonstrated that the spin diffusion length in a GaAs quantum well can be electrically controlled through the measurement of thespin diffusion coefficient by spin grating spectroscopy and of the spin relaxation time by time-resolved optical orientation experiments.