Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 17: Poster Monday: 2D Materials

O 17.10: Poster

Montag, 1. April 2019, 17:45–20:00, Poster F

Influence of Li implantation on the transport properties of graphite flakes — •Johannes Küpper, José Barzola-Quiquia, Pablo Esquinazi, and Jan Meijer — Felix-Bloch-Institut für Festkörperphysik Universität Leipzig

The influence of Li implantation into mesoscopic thin graphite samples on their electrical transport properties were studied as a function of temperature and applied magnetic field. The temperature dependence of the electrical resistance before and after implantation is well described using a semiconducting contribution from the crystals and an additional metallic-like contribution due to the interfaces between them in parallel. We observe that with an increase of implantation dose the temperature dependence of the resistance gets more semiconducting, the resistivity increases an the magnetoresistance decreases. Fast fourier analysis of the Shubnikov de Haas oscillations indicates that the virgen sample is dominated by one carrier type, whereas for the implanted samples we observe the emergence of a new carrier type. Berry phase analysis of the Shubnikov de Haas oscillations indicates that our sample has 2D type charge carriers. Finally, using magnetic force microscoopy we investigate the effect of Li implantation on the creation of magnetic structures in these samples.