Spin-splitting characterization of an InGaSb 2DEG by using magnetoresistance measurements with tilted magnetic fields

摘要

We investigated spin-splitting properties in a metamorphic In0.89Ga0.11Sb/In0.88Al0.12Sb two-dimensional electron gas (2DEG) by means of magnetoresistance measurements with tilted magnetic fields. In magnetoresistance curves with perpendicular magnetic field, we observed clear Shubnikov-de Haas oscillations with the Zeeman-type spinsplitting over 1 T, and spin-splitting vanishing around 1 T. By tilting the 2DEG, we also observed the equidistant separation between the spin-split Landau levels and the coincidence of the spin-up and spin-down levels from the neighboring Landau levels. From these results, we concluded that the dominant zero-field spin-splitting is the Dresselhaus-type but with some contribution of the Rashba term. Additionally, we obtained a 2DEG g-factor vertical bar g vertical bar approximate to 31 from the coincidence method.