Cyclotron-resonance (CR) measurements on two-dimensional (2D) electrons in AlxGa1−xN/GaN heterojunctions reveal large splittings (up to 2 meV) of the CR line for all investigated densities, n2D, from 1 to 4 × 1012 cm−2 over wide ranges of magnetic field. The features resemble a level anticrossing 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 (Formula presented). 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.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jun 11 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics