Subband structure and magneto-conductivity of InAs-MIS inversion layers

We have investigated magneto-transport in an inversion layer of InAs. At low perpendicular magnetic fields, we observed negative magneto-conductivity due to the spin–orbit interaction. The negative B⊥-dependence of conductivity vanishes in a strong parallel magnetic field. The magneto-conductivity in the parallel magnetic field (B⊥=0) is negative at low-magnetic fields, but it turns to positive at 1–View the MathML source. While the electron-concentration dependence suggests that the positive magneto-conductivity is related to the subband structure, the present theory cannot explain the positive magneto-conductivity.