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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2006. V. 9, N 4. P. 012-016.
Confined LO phonon limited free carrier absorption in quantum well wires
1Institute of Physics, National Academy of Sciences of the Azerbayijan Republic,
Prosp. H. Javid, 33, Baku, Az 1143, Azerbayijan
Abstract. The theory of free-carrier absorption is given for quantum well wire for the
case where the carriers are scattered by confined longitudinal-optical (LO) phonons and
the radiation field is polarized along the length of the wire. Both the multisubband
structure and confined phonon modes are considered together. The free carrier absorption
coefficients are calculated taking into account all possible LO phonon modes as well as
all possible electron intersubband transitions. The results show that the absorption
coefficient decreases with increasing the photon frequency and decreases with
temperature. It was found that in quantum wire the electron-optic phonon interaction give
a greater contribution to the absorption than the electron-confined LO phonon
interaction. The results are interpreted in terms of confined LO phonons-assisted
transitions between size quantized subbands.
Keywords: quantum well wires, confined longitudinal-optical, free-carrier absorption.
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