▎ 摘　　要

The electron-hole asymmetry has been measured in highly oriented pyrolitic graphite using magneto-optical absorption measurements. A splitting is observed for transitions at both the K point and the H point of the Brillouin zone of graphite where the effect of trigonal warping vanishes. This result is fully consistent with the Slonczewski, Weiss, and McClure Hamiltonian, providing the free-electron kinetic energy terms are included. Importantly, the free-electron terms enter via the Hamiltonian for an isolated carbon atom and provide a previously unsuspected source of electron-hole asymmetry in graphene.