Faculté des sciences

Optical Phonon Sidebands of Electronic Intersubband Absorption in Strongly Polar Semiconductor Heterostructures

Wang, Z. ; Reimann, K. ; Woerner, M. ; Elsaesser, T. ; Hofstetter, Daniel ; Hwang, J. ; Schaff, William J. ; Eastman, L. F.

In: Physical Review Letters, 2005, vol. 94, no. 037403, p. 1-4

We present the first evidence for a distinct optical phonon progression in the linear and nonlinear intersubband absorption spectra of electrons in a GaN/Al0.8Ga0.2N 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... Plus

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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/Al0.8Ga0.2N 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.