Large Splitting of the Cyclotron Resonance Line in AlGaN/GaN Heterostructures
S. Syed, M. J. Manfra, Y. J. Wang, H. L. Stormer, R. J. Molnar
Abstract
Cyclotron-resonance (CR) measurements on two-dimensional (2D) electrons in AlGaN/GaN heterojunctions reveal large splittings (up to 2 meV) of the CR line for all investigated densities, n2D, from 1 to 4× 1012cm-2 over wide ranges of magnetic field. The features resemble a level anti-crossing and imply a strong interaction with an unknown excitation of the solid. The critical energy of the splitting varies from 5 to 12 meV and as n2D. The phenomenon resembles data from AlGaAs/GaAs whose origin remains unresolved. It highlights a lack of basic understanding of a very elementary resonance in solids.
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