Department of Physics, Panjab University, Chandigarh, India

Department seminar

Date and time: 21 November 2014 (Friday), 3:30 pm
Venue: Seminar Hall

Title: Two-dimensional atomic layers beyond graphene

Speaker: Dr. Ashok Kumar, DS Kothari Fellow, Department of Physics, Panjab University, Chandigarh

Abstract: The discovery of two-dimensional (2D) atomic layer of carbon atoms, i.e. graphene, can be considered as pioneer in the research and development of 2D materials. This breakthrough has opened up the possibility of isolating and exploring the fascinating properties of the atomic layers of other layered materials. In addition to the composition and arrangements of atoms in materials, the dimensionality plays a crucial role in determining their fundamental properties. This has been a most striking highlight in the resent years. Graphene, while being fundamentally and technologically interesting for a variety of applications, is chemically inert and has the lack of band-gap, that limits its device applications. There is enormous interest in fabricating devices and functional materials based on such 2D atomic layers to compliment Graphene. In particular, single layer of transition-metal dichalcogenides have received significant attention because some of them are semiconductor with sizeable band-gaps. In this seminar, a first principles perspective of 2D atomic layers beyond graphene will be demonstrated. Particularly, atomic layers of transition metal dichalcogenides, silicene and hybrid atomic layers of Si and Ge will be discussed for electronic, mechanical and dielectric properties. The effect of layer thickness, external electric field and mechanical strain on the electronic and dielectric properties of these materials will be highlighted.