Megagauss Cyclotron Resonance and Quantum Hall Effect of 2D Electron Gas in HgCdMnTe
G. Grabecki, S. Takeyama
Himeji Institute of Technology, Faculty of Science, 1479-1 Kanaji, Kamigori-cho, Akogun, Hyogo, 678-12 Japan

T. Dietl
Institute of Physics, Polish Academy of Science, Al. Lotnik├│w 32/46, 02-668 Warszawa, Poland

T. Takamasu, Y. Shimamot╬┐ and N. Miura
Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
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Two-dimensional electron gas adjacent to a grain boundary in bicrystal of narrow-gap semiconductor p- Hg0.79Cd0.19Mn0.02Te has been studied under ultra strong impulse magnetic fields (up to 140 T). Both cyclotron resonance and quantum Hall effect are measured for the same samples. The values of the resonance fields point to strong nonparabolicity. A broadening of the line is interpreted in terms of an intersubband mixing that occurs for the upper Landau level. A steep increase in the linewidth in the field range 20-30 T, which coincides with a strong decrease in the Hall resistance is assigned to the field-induced metal-insulator transition in our system.
DOI: 10.12693/APhysPolA.88.731
PACS numbers: 71.25.Hc, 73.50.Fq, 73.20.Dx, 73.40.Lq