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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yee, K.J. Yee, D.S. Yee, J.Y. Kim, D.S. Cho, G.C. Woo, D.H. |
| Copyright Year | 1998 |
| Description | Author affiliation: Dept. of Phys., Seoul Nat. Univ., South Korea (Yee, K.J.) |
| Abstract | Femtosecond coherent phonon experiments are performed on a series of GaAs/Al/sub x/Ga/sub 1-x/As multiple quantum wells (MQWs) with varying x, at fixed well and barrier width of 100 /spl Aring/. For x=0.2, we have found clear beating in time domain. Fourier transformation reveals two distinct peaks at the LO and TO phonon positions, which is indicative of bulk-like plasmon-phonon oscillations in the growth direction. This is surprising, for the supposed carrier confinement due to the relatively large barrier width has been thought to forbid such oscillations. At x=0.5, little beating is seen and only the LO phonon frequency is found in Fourier transformation), in agreement with earlier results on a series of samples with fixed x=0.35. Our results are in agreement with the recent realization of the existence of anomalously large well-to-well coupling of carriers through thick AlGaAs barriers. In addition, for bulk-like, growth-direction plasmon-phonon oscillation to be possible, we believe that optical phonons also should be able to penetrate the barrier and couple with the phonons in the next well. Such a propagating phonon model has been proposed. Finally, our barrier and x-dependent studies show that the growth-direction plasmon-phonon coupling is a more sensitive function of x than of the barrier width. |
| File Size | 166330 |
| File Format | |
| ISBN | 1557525412 |
| DOI | 10.1109/IQEC.1998.680200 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1998-05-08 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Optical Soc. Of America |
| Subject Keyword | Phonons Gallium arsenide Optical coupling Absorption Magnetic resonance Ultrafast optics Quantum well devices Optical sensors Optical superlattices Shape |
| Content Type | Text |
| Resource Type | Article |
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