Ultrafast intersubband relaxation dynamics and coherent nonlinearity in GaN/AlN multiple quantum wells

J. Hamazaki; K. Ikuno; H. Takahashi; H. Kunugita; K. Ema; A. Kikuchi; K. Kishino

doi:10.1117/12.641316

15 February 2006 Ultrafast intersubband relaxation dynamics and coherent nonlinearity in GaN/AlN multiple quantum wells

J. Hamazaki, K. Ikuno, H. Takahashi, H. Kunugita, K. Ema, A. Kikuchi, K. Kishino

Proceedings Volume 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X; 61180C (2006) https://doi.org/10.1117/12.641316
Event: Integrated Optoelectronic Devices 2006, 2006, San Jose, California, United States

Abstract

We have investigated the ultrafast coherent dynamics of the intersubband transition in GaN/AlN multiple quantum wells, using a spectral resolved two-color pump-probe technique. We have found a significant spectrum change as a function of the delaytime τ. For negative delaytimes corresponding to τ < 0, coherent spectrum oscillations have been observed. At τ ~ 0, asymmetric dispersion has been observed. For positive delaytimes, τ > 0, no measurable spectrum change has been observed. From the analysis of these results, we have estimated that intersubband transitions dephasing time is more than 100 fs measured at room temperature.

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J. Hamazaki, K. Ikuno, H. Takahashi, H. Kunugita, K. Ema, A. Kikuchi, and K. Kishino "Ultrafast intersubband relaxation dynamics and coherent nonlinearity in GaN/AlN multiple quantum wells", Proc. SPIE 6118, Ultrafast Phenomena in Semiconductors and Nanostructure Materials X, 61180C (15 February 2006); https://doi.org/10.1117/12.641316

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