Article
Effects of electric and magnetic fields on confined donor states in a coupled double quantum well
Department of Physics, Emory University, Atlanta, Georgia 30322
Journal of Applied Physics (Impact Factor: 2.21). 04/1993; DOI: 10.1063/1.353037 Source: IEEE Xplore

Article: Effects of electric and magnetic fields on confined donor states in a dielectric quantum well.
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ABSTRACT: We have developed a variational formalism for the calculation of the binding energies of hydrogenic donors in the socalled ``dielectric quantum wells,'' where the dielectric constant of the barrier material is significantly smaller than that of the well material, in the presence of magnetic and electric fields applied along the growth axis. We derive an expression for the anisotropic electrondonorion interaction potential analytically by solving the Poisson equation in the layered geometry of quantumwell structures. Binding energies of the 1s and 2p states are then calculated using the Gaussiantype orbital expansion method. Effects of the applied electric field, magnetic field, and the interfacial dielectricconstant mismatch on the binding energies of donor states are studied in detail.Physical review. B, Condensed matter 10/1993; 48(11):80618067. · 3.77 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We study the effect of a magnetic field applied along the growth axis on exciton binding energies in dielectric quantumwell structures, in which the dielectric constant of the confining barriers is significantly smaller than that of the well material. The anisotropic electronhole Coulomb interaction potential is obtained analytically by solving the Poisson equation in the layered geometry of quantum wells. Confinement is provided by the image charge distribution arising from the mismatch of dielectric constants at the interfaces, in addition to that of the quantumwell potential and the applied magnetic field. Exciton binding energies are calculated using the Gaussiantype orbital expansion method. Significantly enhanced binding energies are obtained for the excitons in various dielectric quantumwell structures and their behavior in a magnetic field is discussed.Physical review. B, Condensed matter 11/1994; 50(15):1094710952. · 3.77 Impact Factor 
Article: Resonant hydrogenic impurity states and 1s2p_ {0} transitions in coupled double quantum wells
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ABSTRACT: Calculations of the 1s and resonant 2p0 states of a shallow donor in doublequantumwell structures are performed. The variational method is used to calculate the localized part of the impurity states, taking into account the effect of intersubband mixing. The resonance coupling of the 2p0 state with the first subband is then dealt with using the Green function technique. The results show that for an asymmetric doublequantumwell structure the 1s state has a maximum binding energy as the donor is around the center of the wider well while the 2p0 state has in general a maximum binding energy as the donor is in the narrower well. The resonant coupling of the 2p0 state is stronger for the structures with a stronger intersubband mixing, where the 2p0 energy level is closer to the first subband bottom. The resonanceinduced broadening of the 2p0 state can be as large as 6 meV, corresponding to a lifetime of ∼0.1 ps. The resonance in general causes a negligibly small blueshift but can give a redshift of the order of 1 meV when the resonance is strong. A phase transition of the 2p0 state can occur from the resonant nature to the bound nature by modulation of the interwell coupling. The 1s2p0 transition energy is also calculated. The possibility of population inversion between the 1s and 2p0 states is discussed.Physical Review B 01/2003; 68(16). · 3.66 Impact Factor
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