Phys. Rev. Lett. 76, 2382–2385 (1996)Undressing a Collective Intersubband Excitation in a Quantum WellReceived 7 September 1995; published in the issue dated 25 March 1996 We have experimentally measured the 1–2 intersubband absorption in a single 40 nm wide modulation-doped Al0.3Ga0.7As/GaAs square quantum well as a function of frequency, intensity, and charge density. The low-intensity depolarization-shifted absorption occurs near 80cm-1 (10 meV or 2.4 THz), nearly 30% higher than the intersubband spacing. At higher intensities, the absorption peak shifts to lower frequencies. Our data are in good agreement with a theory proposed by Załużny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.2382
DOI:
10.1103/PhysRevLett.76.2382
PACS:
73.20.Mf, 42.65.Vh, 73.20.Dx, 73.50.Fq
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