Magnetoreflection Studies in Bismuth

Detailed magnetoreflection studies on the binary and bisectrix faces of bismuth are made to look for the fine structure predicted by the Baraff generalization of the Lax two-band model. This generalization is required to explain certain structure in the de Haas-van Alphen data. No fine structure is found experimentally in the magnetoreflection spectra for these optical faces. Magnetoreflection data were also taken for $\overrightarrow{\mathrm{H}}$ in the trigonal direction to look for expected departures from the Lax model. No such departures were found. By assuming a particularly simple form for the Baraff Hamiltonian, it is possible to explain both the magnetoreflection and de Haas-van Alphen data, which had previously been thought to be inconsistent.