Yen-Cheng Kung

TL;DR: In this article, the growth of high-quality monolayer MoS2 with control over lattice orientation has been studied and shown to be composed of coalescing single islands with limited numbers of lattice orientations due to an epitaxial growth mechanism.

TL;DR: The results show that through a careful choice of the TMDs forming the van der Waals heterostructure it is possible to control the circular polarization of the interlayer exciton emission, suggesting the presence of quasi-degenerate momentum-direct and momentum-indirect bandgaps.

TL;DR: In this paper, 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.

TL;DR: In this paper, a strong transverse electroabsorption signal in a monolayer of the 2D semiconductor MoS2 was shown to be dominated by an apparent linewidth broadening of around 15% at a modulated voltage of only V-pp = 0.5 V. Contrary to known variants of the Stark effect, the broadening increases linearly with the applied field strength and arises from a linear variation of the distance between strongly overlapping exciton and trion resonances.

TL;DR: This work accounts for the nontrivial behavior of the valley polarization as a function of the magnetic field by considering the interplay between exchange interaction and phonon-mediated intervalley scattering in a system consisting of Zeeman-split energy levels.