Jinseong Heo

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Despite several years of research into graphene electronics, sufficient on/off current ratio I(on)/I(off) in graphene transistors with conventional device structures has been impossible to obtain. We report on a three-terminal active device, a graphene variable-barrier "barristor" (GB), in which the key is an atomically sharp interface between graphene and(More)
Using first-principles calculations of graphene having high-symmetry distortion or defects, we investigate band gap opening by chiral symmetry breaking, or intervalley mixing, in graphene and show an intuitive picture of understanding the gap opening in terms of local bonding and antibonding hybridizations. We identify that the gap opening by chiral(More)
The downscaling of the capacitance equivalent oxide thickness (CET) of a gate dielectric film with a high dielectric constant, such as atomic layer deposited (ALD) HfO2, is a fundamental challenge in achieving high-performance graphene-based transistors with a low gate leakage current. Here, we assess the application of various surface modification methods(More)
Concepts of non-volatile memory to replace conventional flash memory have suffered from low material reliability and high off-state current, and the use of a thick, rigid blocking oxide layer in flash memory further restricts vertical scale-up. Here, we report a two-terminal floating gate memory, tunnelling random access memory fabricated by a monolayer(More)
All Rights Reserved iii Acknowledgments I would like to express my gratitude to my thesis advisor, Professor Marc Bockrath, whose expertise, understanding, and patience added considerably to my Ph.D. study at Caltech. Marc not only has taught me valuable skills for doing research but has also influenced me with invaluable attitudes to become a scholar. His(More)
All Rights Reserved iii To my mother and my late father iv Acknowledgements It is hard to compress six years of a journey into a couple of pages, but let me give it a shot anyway. I should begin by thanking the person who influenced this thesis the most, my advisor Prof. Marc Bockrath—for taking me on as a curious-but-mostly-clueless engineer, showing faith(More)
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