Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-19
Phys. Rev. Lett. 101, 126804 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.101.126804
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 zone boundaries with anisotropic group velocity, are different from the original massless Dirac fermions. The quasiparticle wavevector (measured from the new Dirac point), the generalized pseudospin vector, and the group velocity are not collinear. We further show that with an appropriate periodic potential of triangular symmetry, there exists an energy window over which the only available states are these quasiparticles, thus, providing a good system to probe experimentally the new massless Dirac fermions. The required parameters of external potentials are within the realm of laboratory conditions.
Cohen Marvin L.
Louie Steven G.
Park Cheol-Hwan
Son Young-Woo
Yang Li
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