Abstract
We study cyclotron resonance (CR) in a two-dimensional electron system on InAs/AlSb-quantum wells observing discrete transitions between adjacent sets of spin-split Landau states. While in three-dimensional electron systems such splittings are well established, no spin-split CR has been observed in a two-dimensional electron system, to date. Theoretical attempts link this fact to the reduced dimensionality and strong electron-electron coupling. Our results, however, can be interpreted quantitatively in a straightforward single-particle model offering new clues to this major puzzle.
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