Cyclotron Resonance Observation of Heavy and Light Spin Subbands in an Ultra-High Mobility 2D Hole Gas in GaAs/(Al,Ga)As: Evidence for Coupled Magnetoplasmons and Many Body Effects
Many-body effects may be conveniently studied in the two dimensional hole system (2DHS) formed in a GaAs/(Al,Ga)As heterostructure. This 2DHS exhibits extreme valence subband non-parabolicity and a large zero-field splitting of the dispersion relationships of the two spin projections1. In consequence, a complex cyclotron resonance (CR) spectrum might be expected2. However, the experimental study of CR in this Communication shows that such a complex spectrum is in fact absent in most cases. This absence is discussed in terms of a collective cyclotron motion due to Coulomb interactions between holes. Additional evidence for such a collective motion effect is provided by the observation of a very strong temperature dependence of the apparent CR position.
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- 3.N. Miura, H. Nojiri and Y. Imanaka, High magnetic fields in semiconductor physics, in“Proc. 22nd Int. Conf.on Physics of Semiconductors”, D. Lockwood, ed., World Scientific, Singapore (1995).Google Scholar
- 4.French Patent CNRS-ENS 1989.Google Scholar
- US Patent nr 5 119 035 (June 2nd 1992).Google Scholar
- 6.U. Ekenburg, priv. comm.(1992)Google Scholar
- V. Nakov, priv. comm. Google Scholar
- 8.H.L.Stormer, Z Schlesinger, A. Chang, D.C.Tsui, A.C. Gossard and W.Wiegmann, Energy structure and quantized Hall effect of two dimensional holes, Phys.Rev.Lett.51: 126 (1983).Google Scholar