Magnetoreflection experiments have been carried out on pyrolytic graphite using circularly polarized radiation from an infrared gas laser source. From a preliminary analysis of the data we find that the carriers at point K in the Brillouin zone are electrons rather than holes. Additional support for this conclusion is obtained from a reexamination of the cyclotron-resonance data of Galt, Yager, and Dail.
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Schroeder et al. (1968) studied this question.
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