Optical phonon sidebands of electronic intersubband absorption in strongly polar semiconductor heterostructures

We present the first evidence for a distinct optical phonon progression in the linear and nonlinear intersubband absorption spectra of electrons in a GaN/Al(0.8)Ga(0.2)N heterostructure. Femtosecond two-color pump-probe experiments in the midinfrared reveal spectral holes on different vibronic trans...

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Published inPhysical review letters Vol. 94; no. 3; p. 037403
Main Authors Wang, Z, Reimann, K, Woerner, M, Elsaesser, T, Hofstetter, D, Hwang, J, Schaff, W J, Eastman, L F
Format Journal Article
LanguageEnglish
Published United States 28.01.2005
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Summary:We present the first evidence for a distinct optical phonon progression in the linear and nonlinear intersubband absorption spectra of electrons in a GaN/Al(0.8)Ga(0.2)N heterostructure. Femtosecond two-color pump-probe experiments in the midinfrared reveal spectral holes on different vibronic transitions separated by the LO-phonon frequency. These features wash out with a decay time of 80 fs due to spectral diffusion. The remaining nonlinear transmission changes decay with a time constant of 380 fs. All results observed are described by the independent boson model.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.037403