Abstract
The outstanding properties of graphene have attracted interest in inorganic, two-dimensional materials with unique electronic and optical attributes. Group-VIB Transition metal dichalcogenides (TMDs) are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into two-dimensional layers of single unit cell thickness. Although TMDs have been studied for decades, recent advances in nanoscale materials characterization have opened up new opportunities for two-dimensional layers of thin TMDs in nanoelectronics and optoelectronics. Group-VIB TMDs including MoS2, MoSe2, WS2 and WSe2 have sizable bandgaps that change from indirect to direct in single layers, allowing applications such as transistors, photodetectors and electroluminescent devices.
In this seminar, I will take a review on the recent research progress of the optical study on electronic structures, vibrational properties and optical valley control in this class of atomic 2D semiconductors.
Anyone interested is welcome to attend.