Phonon sidebands of intersubband absorption in AlGaN/GaN high-electron-mobility transistors

被引:0
|
作者
Wang, Z.
Reimann, K. [1 ]
Woerner, M.
Elsaesser, T.
Hofstetter, D.
Hwang, J.
Schaff, W. J.
Eastman, L. F.
机构
[1] Max Born Inst Nichlineare Opt & Kurzzeitspektrosk, D-12489 Berlin, Germany
[2] Univ Neuchatel, Inst Phys, CH-2000 Neuchatel, Switzerland
[3] Cornell Univ, Ithaca, NY 14853 USA
来源
关键词
phonon sidebands; GaN/AlGaN heterostructure; intersubband transition; independent boson model;
D O I
10.1016/j.physe.2005.12.132
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Femtosecond two-color pump-probe experiments in the mid-infrared are performed on intersubband transitions in a GaN/Al0.8Ga0.2N heterostructure. In these experiments, we observe around zero time delay distinct phonon sidebands, which disappear because of spectral diffusion with a time constant of 80 fs. The signal itself decays with a time constant of 380 fs. The independent boson model agrees very well with all observed results. (c) 2006 Elsevier B.V. All rights reserved.
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页码:562 / 565
页数:4
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