TITLE

Intersubband exchange interaction induced by optically excited electron spins in GaAs/AlGaAs quantum wells

AUTHOR(S)
Morita, K.; Sanada, H.; Matsuzaka, S.; Ohno, Y.; Ohno, H.
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/20/2009, Vol. 94 Issue 16, p162104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Spin-dependent intersubband excitonic interactions have been investigated in GaAs/AlGaAs quantum wells by two-color pump and probe spectroscopy. We generated spin-polarized electrons in the lowest subband by resonant excitation of the heavy-hole exciton (E1-HH1) and observed polarization-dependent broadening of the second-subband exciton resonance (E2-HH2 and E2-LH1). The exchange interaction between the first and the second-subband excitons is found to play a crucial role in polarization-dependent spectral modulation as well as spin-independent Coulomb screening.
ACCESSION #
38225310

 

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