Quantum limit studies in single-crystal and pyrolytic graphiteThe occupied regions of momentum space in graphite are confined to very elongated volumes near the hexagonal Brillouin zone edges. The elongation is along the hexagonal axis (c axis) so that cross-sectional areas perpendicular to that axis are very small. Hence, when magnetic fields are applied parallel to the c axis only the n = 0 Landau levels remain below the Fermi energy for fields above 7 T (Woollam, 1971). The energy bands in graphite can be described by a set of seven parameters (McClure, 1971) (including the Fermi energy as a parameter). In a quantizing magnetic field the Landau levels are described by a secular equation determined by diagonalizing the Hamiltonian (McClure, 1960). A major unusual feature for the levels along the Brillouin zone edge is that the n = 0 Landau level for electrons is independent of magnetic field, while that for holes is field dependent.
Document ID
19750030749
Acquisition Source
Legacy CDMS
Document Type
Other - Collected Works
Authors
Woollam, J. A. (NASA Lewis Research Center Cleveland, Ohio, United States)
Sellmyer, D. J. (MIT Cambridge, Mass., United States)
Dillon, R. O.
Spain, I. L. (Maryland, University College Park, Md., United States)