Impurity center in a semiconductor quantum ring in the presence of a radial electric field

Details Impurity center in a semiconductor quantum ring in the presence of a radial electric field Impurity center in a semiconductor quantum ring in the presence of a radial electric field

2004-11-09

arxiv.org/abs/cond-mat/0411230v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 8 figures

Scientific paper

10.1103/PhysRevB.70.205336

The problem of an impurity electron in a quantum ring (QR) in the presence of a radially directed strong external electric field is investigated in detail. Both an analytical and a numerical approach to the problem are developed. The analytical investigation focuses on the regime of a strong wire-electric field compared to the electric field due to the impurity. An adiabatic and quasiclassical approximation is employed. The explicit dependencies of the binding energy of the impurity electron on the electric field strength, parameters of the QR and position of the impurity within the QR are obtained. Numerical calculations of the binding energy based on a finite-difference method in two and three dimensions are performed for arbitrary strengths of the electric field. It is shown that the binding energy of the impurity electron exhibits a maximum as a function of the radial position of the impurity that can be shifted arbitrarily by applying a corresponding wire-electric field. The maximal binding energy monotonically increases with increasing electric field strength. The inversion effect of the electric field is found to occur. An increase of the longitudinal displacement of the impurity typically leads to a decrease of the binding energy. Results for both low- and high-quantum rings are derived and discussed. Suggestions for an experimentally accessible set-up associated with the GaAs/GaAlAs QR are provided.

Affiliated with

Also associated with

No associations

Rating

Impurity center in a semiconductor quantum ring in the presence of a radial electric field does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Impurity center in a semiconductor quantum ring in the presence of a radial electric field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impurity center in a semiconductor quantum ring in the presence of a radial electric field will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-367027