Band structure and magnetotransport of a two-dimensional electron gas in the presence of spin-orbit interaction
Abstract
The band structure and magnetotransport of a two-dimensional electron gas (2DEG), in the presence of the Rashba (RSOI) and Dresselhaus (DSOI) terms of the spin-orbit interaction and of a perpendicular magnetic field, is investigated. Exact and approximate analytical expressions for the band structure are obtained and used to calculate the density of states (DOS) and the longitudinal magnetoresitivity assuming a Gaussian type of level broadening. The interplay between the Zeeman coupling and the two terms of the SOI is discussed. If the strengths α and β, of the RSOI and DSOI, respectively, are equal and the g factor vanishes, the two spin states are degenerate and a shifted Landau-level structure appears. With the increase of the difference α- β, a novel beating pattern of the DOS and of the Shubnikov-de Haas (SdH) oscillations appears distinctly different from that occurring when one of these strengths vanishes.
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