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PhD. Topics

Institute of Electrical Engineering SAS

Topic
Electrical transport in thin layers of some TMDC materials
PhD. program
Physics of Condensed Matter and Acoustics
Name of the supervisor
Dr. rer. nat. Martin Hulman
Contact:
Receiving school
Faculty of Mathematics, Physics and Informatics
Annotation
In the last two decades, materials characterised by significant dimensional anisotropy represent one of the most studied materials in solid-state physics and materials research. This group also includes transition metal dichalcogenides (TMDC) - compounds of elements S, Se and Te with metals such as Mo, W and Pt. Substances with the chemical formula MX2 can be prepared in very thin layers, which, in the ultimate case, have a thickness of only one unit cell. In that case, we can talk about a genuinely two-dimensional system.
At the Institute of Electrical Engineering, a group deals with the growth of thin layers of TMDC materials and their characterisation. The dissertation would complement the activities of this group. The topic of the dissertation is the investigation of electrical transport properties of (ultra)thin layers of TMDC materials, specifically, that subgroup of materials with a semi-metallic and metallic character. The work has an experimental nature. It also partially includes the growth of thin layers, but the work focuses on measuring transport characteristics. Besides the transport characterisation, the influence of temperature, doping and structure on the conductivity of 2D materials will be investigated. The dissertation also aims to identify possible “exotic” electronic states in TMDC materials, such as superconductivity or charge density waves.
The student will work with vacuum and low-temperature facilities during the dissertation. The experimental results will be analysed in terms of different models of solid-state physics. During the dissertation, the presentation of the results at domestic and international conferences is expected, so a good knowledge of spoken and written English is necessary.