Graphene and its successors – exploring the 2D world

PhD defence, Wednesday 3 May 2017. Antonija Grubišić Čabo

2017.05.03 | Steffi Hjerrild Iversen

Antonija Grubisic Cabo

Snapshots showing excitation in various 2D materals, such as graphene and TMDCs. Using infrared and ultraviolet light, snapshots revealing the dynamics of electrons (green ball) and holes (yellow ball) are recorded. On the right, a sketch of graphene growth on an iridium surface via chemical vapour deposition.

During her PhD studies, Antonija Grubišić Čabo has explored possible pathways leading to industrial applications of high-quality graphene, a two-dimensional (2D) material, grown on metallic surfaces and the non-equilibrium electronic structure of novel 2D materials from the transition metal dichalcogenide (TMDC) family. Graphene is a single layer of carbon atoms that has remarkable electronic and optical properties, and is envisioned to be used in future electronic devices. Semiconducting TMDCs, such as MoS2 and WS2, are considered to be successors to graphene and are anticipated to actualise novel types of electronic devices based on the spin and valley degrees of freedom.

Antonija Grubišić Čabo has investigated how charge carriers in MoS2 and WS2 behave when these materials are brought out of equilibrium using ultrafast laser pulses. This provided results that improve the fundamental understanding of how charge carriers in these materials interact with light, as well as how the electronic structure changes as a result of this interaction. Additionally, methods of tuning the electronic structure of graphene, as well as graphene transfer from metal to a substrate compatible with industrial demands, have been investigated. The results provide means of modifying the band gap of graphene, and illustrate certain limitations of graphene grown on iridium.

The PhD degree was completed at the Interdisciplinary Nanoscience Centre (iNANO) and the Department of Physics, Science and Technology, Aarhus University.

This résumé was prepared by the PhD student.

Time: Wednesday 3 May 2017 at 10.00
1534-125, Auditorium F, Department of Mathematics, Aarhus University
Title of dissertation: Two-Dimensional Materials: From Basic Research in Transition Metal Dichalcogenides to Technique Development for Graphene Applications
Contact information:
Antonija Grubišić Čabo, e-mail:, tel.: (+45) 91826602

Members of the assessment committee:

Professor Carsten Busse, Institut für Materialphysik, Universität Münster, Germany
Professor Martin Weinelt, Fachbereich Physik, Freie Universität Berlin, Germany
Professor Torben René Jensen (chair), Department of Chemistry and iNANO, Aarhus University
Main supervisor:
Professor Philip Hofmann, Department of Physics and Astronomy and iNANO, Aarhus University
Professor Liv Hornekær, Deaprtment of Physics and Astronomy and iNANO, Aarhus University
Language: The PhD dissertation will be defended in English

The defence is public.
The dissertation is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.

PhD defence
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Revised 25.09.2017