Engineering artificial graphene in a two-dimensional electron gas

Details Engineering artificial graphene in a two-dimensional electron gas Engineering artificial graphene in a two-dimensional electron gas

2009-04-27

arxiv.org/abs/0904.4191v1

Phys. Rev. B 79, 241406(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 + epsilon pages, 3 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.79.241406

At low energy, electrons in doped graphene sheets behave like massless Dirac fermions with a Fermi velocity which does not depend on carrier density. Here we show that modulating a two-dimensional electron gas with a long-wavelength periodic potential with honeycomb symmetry can lead to the creation of isolated massless Dirac points with tunable Fermi velocity. We provide detailed theoretical estimates to realize such artificial graphene-like system and discuss an experimental realization in a modulation-doped GaAs quantum well. Ultra high-mobility electrons with linearly-dispersing bands might open new venues for the studies of Dirac-fermion physics in semiconductors.

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