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Chan-Cuk Hwang
Chan-Cuk Hwang
Pohang Accelerator Laboratory, Republic of Korea
Layered heterostructures for functionalization of graphene

Graphene has intriguing band structure. Its conduction and valence bands meet together at a Dirac point and the energy depends linearly on the wave vector near the K-points. However, real graphenes often show different electronic structures from the simple one depending on what they are interfacing with. This indicates that we are able to tune graphene’s electronic structure by engineering its interface for specific applications. In this talk, we will show how graphene’s electronic structure can change depending on substrates, such as Cu and Ni, using angle-resolved photoemission spectroscopy (ARPES) at the Pohang Accelerator Laboratory (PAL) and scanning tunneling microscopy. The electronic structures changed by substrate can be further altered by intercalating or adsorbing foreign atoms. We provide ARPES data for the intercalation of alkali and alkaline earth metals between graphene and substrate together with additional overlayer formation in the case of alkaline earth metals. Such layered heterostructures could be useful to give a valuable function to graphene, for examples, possible superconductivity, photoluminescence, etc., that we do not generally expect in graphene.

Dr. Chan-Cuk Hwang is an associate chief Scientist and a beamline manager of Pohang accelerator laboratory (PAL). He got his Ph.D. in the field of experimental physics on solid surface at the department of physics, Syunkyunkwan university. Since 2000, he spent almost two years as a postdoctoral fellow and then has been working as a staff scientist at PAL. He was leading the construction of a high-resolution photoemission spectroscopy and an angle-resolved photoemission spectroscopy beamlines. He has been contributing considerably to the surface & nano community in south Korea by constructing and operating the two soft x-ray beamlines dedicated to solid surface research. He contributed to the PLS-Ⅱ, PAL-XFEL, spin-resolved ARPES projects as well. He has been studying solid surfaces and their electronic structures for over 20 years. He published ~ 100 papers and presented lots of talks in international conferences and workshops as an invited speaker based on the results using the two beamlines. In 2012, he played an important role for getting the prestigious SRC project as a subgroup leader in the field of physics and now he is carrying out the project as a principal investigator. In addition, he also served PAL as surface science group leader and vacuum ultraviolet & soft x-ray team leader for several years.
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