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Negative Thermal Expansion Coefficient of Graphene Measured by Raman Spectroscopy
Duhee Yoon, Young-Woo Son, Heonsik Cheong
The thermal expansion coefficient (TEC) of single-layer graphene is estimated with temperature-dependent Raman spectroscopy in the temperature range between 200 and 400 K. It is fo…
Landau Levels and Quantum Hall Effect in Graphene Superlattices
Cheol-Hwan Park, Young-Woo Son, Li Yang +2
We show that, when graphene is subjected to an appropriate one-dimensional external periodic potential, additional branches of massless fermions are generated with nearly the same…
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 in Graphene Nanoribbons
Young-Woo Son, Marvin L. Cohen, Steven G. Louie
Based on a first-principles approach, we present scaling rules for the band gaps of graphene nanoribbons (GNRs) as a function of their widths. The GNRs considered have either armch…
Half-Metallic Graphene Nanoribbons
Young-Woo Son, Marvin L. Cohen, Steven G. Louie
Electrical current can be completely spin polarized in a class of materials known as half-metals, as a result of the coexistence of metallic nature for electrons with one spin orie…