This level is ascribed to the donor impurity
of nitrogen and the observed concentration profile of silicon carbide diode associated with the diffusion of nitrogen as background impurities.
[[nabla].sup.2.sub.p] is the in-plane Laplacian operator, [??] = (x, y, z) is the electron position, and [r.sub.ei] is the electron-impurity distance, with the donor impurity localized at ([x.sub.i], [y.sub.i], 0).
The upper row corresponds to conduction band states [graphics (a) and (b)], and the lower row contains the energies of electrons coupled to the donor impurity located at the elliptical QD center.
In this paper we studied the effects of an intense laser on the binding energy in the ground state of a neutral donor impurity, placed in different positions on the quantum well.
Consider first that use a donor impurity [D.sup.o].
where [DELTA][E.sub.C] is the shift of the conductive band, [n.sub.in] and [n.sub.ip] are the intrinsic electron concentrations (for n- and p-regions, respectively), [N.sub.a] and [N.sub.d] are the acceptor and donor impurity
Ismail, "Binding energy of an off-centre hydrogenic donor impurity
in a spherical quantum dot," Phys.
The polaron-induced photoionization cross section as a function of normalized photon energy for on-centre donor impurity
in the quantum wire is investigated.
 theoretically analyzed the influence of compressive stress on shallow donor impurity
states in symmetric GaAs/[Al.sub.x][Ga.sub.1-x]As double quantum dots.
The linear and the third-order nonlinear optical absorption spectra of a donor impurity
confined by a quantum ring are studied using the matrix diagonalization method within the effective-mass approximation in .