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Letter

Nature Physics 4, 532–535 (1 July 2008) | doi:10.1038/nphys989

Dirac charge dynamics in graphene by infrared spectroscopy

Z. Q. Li , E. A. Henriksen , Z. Jiang , Z. Hao , M. C. Martin , P. Kim , H. L. Stormer & D. N. Basov

A remarkable manifestation of the quantum character of electrons in matter is offered by graphene, a single atomic layer of graphite. Unlike conventional solids where electrons are described with the Schr|[ouml]|dinger equation, electronic excitations in graphene are governed by the Dirac hamiltonian.