690 citations · 2.1k across the 6 of their papers we have counts for
6 papers
New Generation of Massless Dirac Fermions in Graphene under External Periodic Potentials
Cheol-Hwan Park, Li Yang, Young-Woo Son +2
We show that new massless Dirac fermions are generated when a slowly varying periodic potential is applied to graphene. These quasiparticles, generated near the supercell Brillouin…
Electron Beam Supercollimation in Graphene Superlattices
Cheol-Hwan Park, Young-Woo Son, Li Yang +2
Although electrons and photons are intrinsically different, importing useful concepts in optics to electronics performing similar functions has been actively pursued over the last…
Energy Gaps and Stark Effect in Boron Nitride Nanoribbons
Cheol-Hwan Park, Steven G. Louie
A first-principles investigation of the electronic properties of boron nitride nanoribbons (BNNRs) having either armchair or zigzag shaped edges passivated by hydrogen with widths…
Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene
Cheol-Hwan Park, Feliciano Giustino, Jessica L. McChesney +5
We show that the electron-phonon coupling strength obtained from the slopes of the electronic energy vs. wavevector dispersion relations, as often done in analyzing angle-resolved…
Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
Cheol-Hwan Park, Li Yang, Young-Woo Son +2
Charge carriers of graphene show neutrino-like linear energy dispersions as well as chiral behavior near the Dirac point. Here we report highly unusual and unexpected behaviors of…
Velocity Renormalization and Carrier Lifetime in Graphene from Electron-Phonon Interaction
Cheol-Hwan Park, Feliciano Giustino, Marvin L. Cohen +1
We present a first-principles investigation of the phonon-induced electron self-energy in graphene. The energy dependence of the self-energy reflects the peculiar linear bandstruct…