Sun D, Divin CJ, Berger C, Heer WD, Rioux J, Sipe J, Norris TB. THz emission from coherently controlled photocurrents in epitaxial graphene. 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser Science Conference, CLEO/QELS 2009. 2009.