Magnetic field dependence of the binding energy of shallow donors in GaAs quantum-well wires

Magnetic field and finite barrier-height effects on the polarizability of a shallow donor in a GaAs quantum wire

“…The application of a magnetic field to a crystal changes the dimensionality of electronic levels and leads to a redistribution of the density of states. Recently, Niculescu et al [17] have calculated the binding energy of a shallow donor in cylindrical GaAs quantum wire in the presence of an axial magnetic field. They have adopted an infinite confinement potential and taken into account the impurity position in the wire.…”

1 s–2 p±transitions between hydrogenic states in GaAs low-dimensional systems under external fields

“…Particularly in a strong confinement regime, a large spread of the ground-state level is expected as the donor position varies [11,14]. It is also well known that the presence of a magnetic [10] or an electric field [14,15] breaks down the degeneracy of the states corresponding to symmetrically positioned impurities in the structure. Thus, to calculate the states of an impurity located along the z-axis, a distance z i from the center of the LDS, the Coulomb interaction is rewritten as On-center intradonor 1s-2 p + transition energy versus applied electric field and for two magnetic field strengths.…”

“…Numerical calculations and magnetophotoluminescence studies of ln 0.13 Ga 0.8 As/GaAs modulated-barrier quantum wires have been performed in magnetic fields up to B = 9 T by Bayer et al [8]. Recently, the effects of an applied magnetic field on the binding energy of donor impurities in cylindrical GaAs QWWs have been studied [9,10]. It was shown that some excited states are not bounded for some values of the wire radius and of the magnetic field [9].…”

“…It was shown that some excited states are not bounded for some values of the wire radius and of the magnetic field [9]. Also, as a result of the presence of the magnetic field, the impurity binding energy may be increased or decreased depending on the impurity location in the quantum structure [10]. The effect of the quantum confinement on the energy spectra has been studied in the case of neutral donors [11] and negatively charged donors [12] in spherical QD.…”

Binding energy and photoionization cross section of hydrogen-like donor impurity in quantum well-wire in electric and magnetic fields

“…The binding energy of an impurity, located on the cylindrical quantum well-wire (QWW) axis (on-axis impurity) in the presence of longitudinal magnetic field is calculated within the framework of the infinite and finite potential models respectively in [9,10]. In [11][12][13] the influence of transverse electric field and confining potential shape on the binding energy in a QWW of rectangular crosssection are studied.…”