Resonant Subband Landau Level Coupling in Symmetric Quantum Well

Details Resonant Subband Landau Level Coupling in Symmetric Quantum Well Resonant Subband Landau Level Coupling in Symmetric Quantum Well

2010-07-07

arxiv.org/abs/1007.1197v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 2 figures

Scientific paper

Subband structure and depolarization shifts in an ultra-high mobility GaAs/Al_{0.24}Ga_{0.76}As quantum well are studied using magneto-infrared spectroscopy via resonant subband Landau level coupling. Resonant couplings between the 1st and up to the 4th subbands are identified by well-separated anti-level-crossing split resonance, while the hy-lying subbands were identified by the cyclotron resonance linewidth broadening in the literature. In addition, a forbidden intersubband transition (1st to 3rd) has been observed. With the precise determination of the subband structure, we find that the depolarization shift can be well described by the semiclassical slab plasma model, and the possible origins for the forbidden transition are discussed.

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