Density of impurity states and optical absorption spectra associated with shallow impurities in quantum - well wires

We analyze the effect of the mixing of the 1s and 2p x,y subbands on the ground state binding energy of the off-axis donors in cylindrical nanotubes by using the recently developed fractal dimension method. Curves of the D 0 ground state binding energies as a function of the donor distance from axis are presented and compared with those obtained previously without consideration of the effect of the subband mixing. Also, we analyze the density impurity states in nanotubes with randomly distributed donors.

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Density of electronic states in impurity‐doped quantum well wires

Betancur

Orozco

González

et al. 2005

Physica Status Solidi (b)

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Effect of magnetic field on off‐axis donor binding energy in a nanotube

Orozco

González

Duarte

et al. 2006

Physica Status Solidi (b)

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We analyze the effect of the mixing of the low-lying s and , p x y subbands on the ground-state binding energy of the off-axis donors in cylindrical nanotubes in the presence of a magnetic field parallel to the axis. We express the wave function as a product of combinations of s and p subband wave functions and an envelope function that depends only on the electron -ion separation. By using the variational principle we derive a differential equation for the envelope function, which we solve numerically. The curves for the dependence of the ground-state binding energies on the donor distance from the axis are presented and it is shown that the effect of the subband mixing for off-axis donors in nanotubes is considerable. It is found that the magnetic field enhances the binding energies of donors located close to the axis whereas for donors located far from the axis the effect of the magnetic field on the binding energy is the opposite.

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On the Density of States in N‐Dimensional Electron Gas

Gombos

Tuza

Pődör

1992

Physica Status Solidi (b)

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Density of impurity states and optical absorption spectra associated with shallow impurities in quantum - well wires

Cited by 9 publications

References 22 publications

Density of electronic states in impurity‐doped quantum well wires

Density of electronic states in impurity‐doped quantum well wires

Effect of magnetic field on off‐axis donor binding energy in a nanotube

On the Density of States in N‐Dimensional Electron Gas

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