Experimental Studies on Electron Scattering in Graphene
Prof. Dong-Keun Ki
Department of Physics, The University of Hong Kong
E-mail: dkki@hku.hk
Abstract
Graphene is a one-atom-thick crystal made of Carbon atoms arranged in a honeycomb lattice. Thus, its charge carriers are bound to move only on the material surface, which makes their transport properties—in other words, electron scattering behavior—highly susceptible to the change of the environments. Moreover, same as any other thin membranes, graphene can be folded, crumpled, stretched, compressed, and rolled which can further affect its transport properties. Here, I will first introduce electronic properties of graphene, and discuss various experimental efforts to probe and understand microscope mechanism of electron scattering in graphene. I will show that they are indeed sensitive to the environments and to the mechanical deformation.1-4 Examples are scattering by ripples in graphene,1 or by other electrons,2,3 or by foreign molecules,4 to name a few. Potential future implications will also be discussed.
References
1. Nuno J. G. Couto, Davide Costanzo, Dong-Keun Ki, Kenji Watanabe, Takashi Taniguchi, Francisco Guinea, and Alberto F. Morpurgo, Phys. Rev. X 2014, 4, 041019.
2. Dong-Keun Ki, Dongchan Jeong, Jae-Hyun Choi, Hu-Jong Lee, and Kee-Su Park, Phys. Rev. B 2008, 78, 125409.
3. Youngwoo Nam, Dong-Keun Ki, David Soler-Delgado, and Alberto F. Morpurgo, Nat. Phys. 2017, 13, 1207.
4. Christophe Caillier, Dong-Keun Ki, Yuliya Lisunova, Laroslav Gaponenko, Patrycja Paruch, and Alberto F. Morpurgo, Nanotech. 2013, 24, 405201.
Biography
Prof. Dong-Keun Ki received PhD from POSTECH, Korea in 2010, and is currently appointed as an Assistant Professor in The University of Hong Kong (HKU) since 2018. Before joining the HKU, he has worked as a Senior Research Associate in the University of Geneva in Switzerland with Prof. Alberto Morpurgo. He focuses on understanding quantum transport properties of various types of low-dimensional nanostructures, including graphene and 2D materials. He has published several high-impact papers in Nat. Phys., Nat. Comm., PRL, and Science.