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Electronic and optical properties of two-dimensional InSe

Speaker: 
Vladimir Falko (University of Manchester, UK)
Date: 
Tue, 25/10/2016 - 2:30pm
Location: 
Physics Conference Room (S11-02-07)
Host: 
Prof Vitor M. Pereira
Event Type: 
Seminars

Abstract

We present the evolution of electronic band structure of InSe and other III-VI semiconductors) films, from stoichiometric mono-layer to multilayer films, and trace consequences of these changes for optical properties of these 2D materials. This study is based on the ab initio DFT and related multi-orbital tight-binding model analysis of the electronic band structure and wave functions in the two-dimensional N-layer InSe crystals. We find that the conduction band edge electron mass in few-layer InSe is quite light (comparable to Si), which suggests opportunities for high-mobility devices and the development of nanocircuits. In contrast, the valence band in mono-, bi- and trilayer InSe is flat, opening possibilities for strongly correlated hole gases in p-doped systems.

About the speaker

Professor Vladimir Falko is professor of theoretical physics and Research Director of the National Graphene Institute at the University of Manchester, and one of the UK's leading condensed matter theorists. 

He obtained his doctoral degree at the Institute for Solid State Physics (Russian Academy of Science), followed by postdoctoral experience at Max-Planck-Institute in Stuttgart and Oxford University. Prior to joining the University of Manchester, V. Falko served for 19 years at Lancaster University where he was Distinguished Professor and Head of Theory Division of its Physics Department. Falko was responsible for many advances in the theory of localisation and quantum transport in mesoscopic systems, and made substantial contributions towards the understanding of electronic and optical properties of graphene, including the discovery of bilayer graphene. His current research interests include modelling graphene-based electronic and optoelectronic systems and developing theories of electronic and optical properties of various atomically thin two-dimensional crystals and their heterostructures. His has received a Humboldt Fellowship, an EPSC Advanced Fellowship, ERC Advanced Investigator and Synergy Grants, and the Royal Society Wolfson Foundation Research Merit Award. 

Falko played a pivotal role in building up the European research community in graphene and two-dimensional materials by initiating the ‘Graphene Week’ conference series and by being one of the organisers and leaders of the European Graphene Flagship Project. From 2014, he is the founding Editor-in-Chief of the IoP Journal ‘2D Materials’ (with 2016 IF of 9.6).

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