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Direct measurement of quantum phases in graphene via photoemission spectroscopy
Choongyu Hwang, Cheol-Hwan Park, David A. Siegel +3
Quantum phases provide us with important information for understanding the fundamental properties of a system. However, the observation of quantum phases, such as Berry's phase and…
Electron-Phonon Coupling in Highly-Screened Graphene
David A. Siegel, Choongyu Hwang, Alexi V. Fedorov +1
Photoemission studies of graphene have resulted in a long-standing controversy concerning the strength of the experimental electron-phonon interaction in comparison with theoretica…
Many-body interactions in quasi-freestanding graphene
David A. Siegel, Cheol-Hwan Park, Choongyu Hwang +4
The Landau-Fermi liquid picture for quasiparticles assumes that charge carriers are dressed by many-body interactions, forming one of the fundamental theories of solids. Whether th…
Quasi-Freestanding Multilayer Graphene Films on the Carbon Face of SiC
David A. Siegel, Choongyu Hwang, Alexei V. Fedorov +1
The electronic band structure of as-grown and doped graphene grown on the carbon face of SiC is studied by high-resolution angle-resolved photoemission spectroscopy, where we obser…
The stability of graphene band structures against an external periodic perturbation; Na on Graphene
Choongyu Hwang, Sunyoung Shin, Seon-Myeong Choi +7
We report that the band of graphene sensitively changes as a function of an external potential induced by Na especially when the potential becomes periodic at low temperature.…
New Synthesis Method for the Growth of Epitaxial Graphene
Xiaozhu Yu, Choongyu Hwang, Chris M. Jozwiak +3
As a viable candidate for an all-carbon post-CMOS electronics revolution, epitaxial graphene has attracted significant attention. To realize its application potential, reliable met…