Photoluminescence dynamics in GaAs/AlAs quantum wells modulated by one-dimensional standing surface acoustic waves

Sogawa, Tetsuomi; Sanada, Haruki; Gotoh, Hideki; Yamaguchi, Hiroshi; Miyashita, Sen; Santos, Paulo V.
March 2009
Applied Physics Letters;3/30/2009, Vol. 94 Issue 13, p131912
Academic Journal
The effects of standing surface acoustic waves (SAWs) on carrier dynamics in GaAs/AlAs quantum wells are investigated by spatially and time-resolved photoluminescence (PL) spectroscopy. We found that the PL spectra vary considerably depending on the position and the phase of the standing SAW field. The PL spectra are characterized by oscillations in the PL intensity and emission energy due to the motion of free carriers and excitons driven by the piezoelectric fields as well as by the strain-induced band-gap gradient. It is also demonstrated that the positions of the nodes and antinodes of the standing SAW are precisely controlled.


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