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14 papers · 2 filters
Helical Metal Inside a Topological Band Insulator
Ying Ran, Yi Zhang, Ashvin Vishwanath
Topological defects, such as domain walls and vortices, have long fascinated physicists. A novel twist is added in quantum systems like the B-phase of superfluid helium He, whe…
Determination of the electronic structure of bilayer graphene from infrared spectroscopy results
L. M. Zhang, Z. Q. Li, D. N. Basov +3
We present an experimental study of the infrared conductivity, transmission, and reflection of a gated bilayer graphene and their theoretical analysis within the Slonczewski-Weiss-…
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…
Transient terahertz spectroscopy of excitons and unbound carriers in quasi two-dimensional electron-hole gases
R. A. Kaindl, D. Haegele, M. A. Carnahan +1
We report a comprehensive experimental study and detailed model analysis of the terahertz dielectric response and density kinetics of excitons and unbound electron-hole pairs in Ga…
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…
Making Massless Dirac Fermions from Patterned Two-Dimensional Electron Gases
Cheol-Hwan Park, Steven G. Louie
Analysis of the electronic structure of an ordinary two-dimensional electron gas (2DEG) under an appropriate external periodic potential of hexagonal symmetry reveals that massless…