Infrared absorption in Si–Si1−xGex–Si quantum wells

The eight-band k·pmethod and the envelope function approximation is used to describe the infrared inter-subband absorption in Si–Si1−xGex–Si quantum wells. The valence and conduction bands are explicitly taken into account leading to an accurate description of the mixing of the conduction and valence band functions. Both as-grownand interdiffused (annealed) quantum wells are discussed.