Transport Studies on CVD - Grown Graphene

In this thesis, we report transport studies performed on CVD-grown graphene. We perform resistivity and hall measurements on a large-area sample at 4' K. We measure the carrier mobility of the sample and find it to be on the order of 1000 cm 2/Vs, whereas monolayer graphene regularly exhibits much higher mobilities. We also examine what we find to be weak signatures of Shubnikov-de Haas oscillations in magnetic field sweeps. Finally, we study magneto-resistance effects at low fields, and find that the sample exhibits weak-localization effects. Thesis Supervisor: Raymond C. Ashoori Title: Professor of Physics Acknowledgments I owe many thanks to many people for the work that was carried out here. First and foremost, I am supremely grateful to my advisor, Prof. Ray Ashoori, for allowing me to take on this project and work through it my own way, even if that way was not always the best. His guidance and enthusiasm, combined with his deep intuition for thinking about many of the issues that came up, were invaluable. This project would never have been successful without the continual help of both Dr. Lu Li an Dr. Oliver Dial, the two postdoctorate fellows working in the group. I would like to thank them both for their willingness to help me run the experiment (especially at ungodly hours of the night) and for generously giving of their time in order sit down and talk with me about the results. I also owe thanks to Anjan Soumyanarayanan and Eric Lin for advice on some of the glitches that came up, as well as to Dr. Michele Zaffalon for discussions about weak localization. Thanks is also due to Prof. Robert Jaffe for discussions about notation choice in the tight-binding model of graphene.