01295nas a2200241 4500008004100000020001400041245007000055210006900125260001100194300001400205490000700219520060900226100001400835700001900849700001900868700002000887700002100907700002000928700001600948700002000964700002000984856004901004 1996 eng d a0031-900700aUndressing a collective intersubband excitation in a quantum well0 aUndressing a collective intersubband excitation in a quantum wel cMar 25 a2382-23850 v763 a
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 80 cm(-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 Zaluzny, which attributes the redshift to a reduction in the depolarization shift as the excited subband becomes populated.
1 aCraig, K.1 aGaldrikian, B.1 aHeyman, J., N.1 aMarkelz, A., G.1 aWilliams, J., B.1 aSherwin, M., S.1 aCampman, K.1 aHopkins, P., F.1 aGossard, A., C. uhttps://markelz.physics.buffalo.edu/node/265