Magnetic field-induced metal-insulator transitions in graphite and diluted magnetic semiconductors

摘要

Two topical subjects related with the effect of magnetic held on electrical conduction and the metal-insulator transition are discussed. The first topic is an electronic phase transition in graphite, which is interpreted as a manifestation of a nesting-type instability inherent to a one-dimensional narrow Landau sub-band. The second topic is spin-dependent tranport in III-V based diluted magnetic semiconductors; in particular, a large negative magnetoresistance observed in the vicinity of metal-nonmetal transition. [References: 19]