The two-dimensional electron gas at the CdTe/InSb interface: Cyclotron resonance and Shubnikov-de Haas investigations

• Published in: Surface science 1992, Vol.267 (1), p.133-136
• Main Authors: Grimes, R.T., Janssen, T.J.B.M., Stanaway, M.B., Langerak, C.J.G.M., Singleton, J., Ashenford, D.E., Lunn, B., Hill, G., Chamberlain, J.M.
• Format: Article
• Language: English
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/0039-6028(92)91106-L

The 2DEG in CdTe/InSb heterojunctions has been investigated using magnetotransport and far-infrared magnetotransmission measurements. Two series of oscillations are seen in the Shubnikov-de Haas effect; however, a comparison of the parallel field magnetoresistance with the universal curves of Reisinger and Koch indicates that six subbands are occupied, and that the total carrier density is around 4.7 × 10 12 cm −2. A broad cyclotron resonance is observed in the magnetotransmission, yielding an effective mass of m ∗ = 0.045m e . This is consistent with theoretical predictions for electrons in InSb inversion layers with a carrier density close to 5 × 10 12 cm −2. Published data on other similar systems will be discussed in the light of these measurements.