High-field mobility of light holes in strained quantum wells

Hjalmarson, Harold P.
May 1989
Applied Physics Letters;5/29/1989, Vol. 54 Issue 22, p2215
Academic Journal
The small mass of light holes in strained quantum wells leads to high mobility at low fields. However, at high fields, the holes become hot and populate the heavy hole band, thereby greatly reducing their mobility. An analysis shows that the high-field mobility primarily depends on Δ, the strain splitting of the light and heavy holes, and hω0, the optical phonon energy. If Δhω0, the high mobility persists until the applied power per carrier P exceeds a characteristic power P0 . Above this power, negative differential mobility (a Gunn effect) occurs when the light holes transfer to the heavy hole band. For thin p-doped In0.2 Ga0.8 As/GaAs single-strained quantum wells, Monte Carlo calculations show that P0 ≊5×10-8 W/carrier.


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