The fine structure of cyclotron and spin resonances at their crossing: interplay between spin-orbit and Coulomb interactions
V I Fal'ko; V I Fal'ko; Max-Planck-Inst. fur Festkorperforschung, Stuttgart, Germany
Журнал:
Journal of Physics: Condensed Matter
Дата:
1993-11-15
Аннотация:
We compare the anticrossing of the spin and cyclotron resonances in spin-polarized and non-polarized phases of a two-dimensional electron gas subjected to a strong tilted magnetic field. The spin-orbit coupling splits these resonances into three lines with the gaps between them exactly equal to delta <sub>2n+1</sub>=V<sub>so</sub> rho <sub>F</sub> and delta <sub>2n</sub>=v<sub>so</sub> rho <sub>F</sub>/ square root 2 at odd- and even-integer factors, respectively. The 1/ square root 2 factor difference between the gaps delta <sub>2n</sub> and delta <sub>2n+1</sub> arises from the existence of two collective spin-wave-density modes in the polarized phase of interacting electrons in the system with two filled Landau levels. This allows us to predict a new type of spectral Shubnikov-de Haas oscillations, which indicates the re-entrance of the system into the spin-polarized state.
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