Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-08-22
Nano Lett. 9, 1793-1797 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 4 figures, significant revision of abstract, text, and figures
Scientific paper
10.1021/nl803706c
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 Dirac fermions are generated near the corners of the supercell Brillouin zone. The required potential parameters are found to be achievable under or close to laboratory conditions. Moreover, the group velocity is tunable by changing either the effective mass of the 2DEG or the lattice parameter of the external potential, and it is insensitive to the potential amplitude. The finding should provide a new class of systems other than graphene for investigating and exploiting massless Dirac fermions using 2DEGs in semiconductors.
Louie Steven G.
Park Cheol-Hwan
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