Thickness dependent electronic and vibrational properties of layered materials

Date: 20 March 2018

Venue: University of Antwerp - Campus Groenenborger - Room U.244 - Groeneborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Short description: Condensed Matter Theory lecture presented by Dr Mehmet Yagmurcukardes

The electronic and vibrational properties of ultra-thin two-dimensional (2D) layered materials are highly related to their thickness. The quantum confinement effects in atomic scale and the presence of weak interlayer van der Waals interaction in few layers strongly influence their properties and make them to be dependent on the layer number (N) from monolayer to multilayer cases. Recent studies on different types of layered materials such as graphene, MoS2, and blackphosphorus demonstrated that they may exhibit electronic phase transitions from semi-metal to semiconductor and even from direct-gap semiconductor to indirect gap. In addition, in vibrational properties the low-frequency Raman spectrum plays an important role in determining the layer number, stacking order configurations, and provide a unique opportunity to study interlayer coupling. In this talk, I will summarize some of those studies and present our results on layered PbI2 crystals. Our results on the layer number-dependent electronic and vibrational properties of few-layer PbI2 will be discussed.

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