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Download Advances in Electronics and Electron Physics, Vol. 72 by Peter W. Hawkes (Ed.) PDF

By Peter W. Hawkes (Ed.)

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1982; Greene and Bajaj, 1983; Chang 1987) Off-center impurities display a similar behaviour with L as the on-center one. , 1983; Chang 1987). e. that the carrier is forced by the quantum well to be the closer from the impurity site. As shown in Fig. , 1984b; Chang 1987). When the impurity is in the barrier it still creates a bound state below the ground quantum well subband. The binding energy of this state decreases relatively slowly with increasing separation between the impurity and the well.

In the latter case the Landau quantization (characteristic energy: heB/m*c, where m* is an appropriate effective mass) hardly competes with the size quantization (characteristic where L is the characteristic length of the quantum well). energy: h27cc2/2m*L2 1. Electric Field EfSects i. In-plane Electric Field (F//x) Let us for simplicity restrict our consideration to r,-related heterostructure states. In the parabolic limit and neglecting effective mass and dielectric mismatches, the envelope functions are the solutions of: 36 G.

Terms have a very small effect and we feel legitimate to discard the whole 6% matrix. Under this approximation, the superlattice dispersion relations become very easy to derive as we have to deal only with coupled first order differential equations. The physics becomes more transparent if one projects the 8 x 8 system onto the 2 x 2 subspace spanned by S t and S J . , 1985; Larsen, 1968). One readily finds that the conduction states are twice degenerate and that the envelope functions for the z motion xl(z) and xz(z) satisfy the same second order differential equation: - - (T,+ V,(z))x(z)= E X ( 4 - (43) where the kinetic energy term is: where 9has been defined in Eq.

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