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10 papers · 1 filter
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…
Spontaneous Particle-Hole Symmetry Breaking in the Fractional Quantum Hall Effect
Michael R. Peterson, Kwon Park, S. Das Sarma
The essence of the fractional quantum Hall effect is believed to be well captured by the Moore-Read Pfaffian (or anti-Pfaffian) description. However, an important mystery r…
Realizable spin models and entanglement dynamics in superconducting flux qubit systems
Qian Qian Shi, Sam Young Cho, Bo Li +1
Realizable spin models are investigated in a two superconducting flux qubit system. It is shown that a specific adjustment of system parameters in the two flux qubit system makes i…
Metal contacts in carbon nanotube field effect transistors: Beyond the Schottky barrier paradigm
J. J. Palacios, P. Tarakeshwar, Dae M. Kim
The observed performances of carbon nanotube field effect transistors are examined using first-principles quantum transport calculations. We focus on the nature and role of the ele…