Effects of High Magnetic Field on the Energy Spectra of Two Donors in a Strained Zinc Blende Quantum Dot

Authors D. Prasanna, P. Elangovan

PG & Research Department of Physics, Pachaiyappa’s College, 600030 Chennai, India

Е-mail dprasanna85@gmail.com
Issue Volume 11, Year 2019, Number 3
Dates Received 04 February 2019; revised manuscript received June 2019; published online 25 June 2019
Citation D. Prasanna, P. Elangovan, J. Nano- Electron. Phys. 11 No 3, 03006 (2019)
DOI https://doi.org/10.21272/jnep.11(3).03006
PACS Number(s) 73.21.Fg; 73.21.La
Keywords Strained quantum dot, Variational method (2) , Coulomb energy.

The electronic states of two donors in a strained quantum dot (QD) under the influence of high magnetic field have been investigated. Numerical calculations are carried out using variational principle within the single band effective mass approximation by means of magnetic field strength through energy dependent effective mass. Studies on the donor problem in a QD are a useful tool for understanding the electronic and optical properties of impurities. The study of two donor impurities in low dimensional semiconductor structures with and without magnetic fields is performed. We will adopt to calculate the binding energy in zinc blende QD. Our investigations include Zeeman Effect in the Hamiltonian. The magnetic field induced diamagnetic susceptibility of two donors is computed as a function of QD radius. The variation of two-donor binding energy as a function of dot radius for different magnetic field strength applied with and without field is conducted. The results show that the binding energy increases with the decrease of dot radius, reaching a maximum value, and then decreases when the dot radius still decreases. The contribution of diamagnetic susceptibility to the donor binding energy is the measure of spatial extension of the ground state. The inter-donor distance is the measure of Coulomb interaction energy of the two donor systems. The Coulomb interaction energy is only appreciable when inter-donor distances approach nearby or lesser than the effective Bohr radius. Our results show that the high magnetic field, the QD radius and Coulombic interaction energy have a remarkable influence on the electronic states of two donors in a strained QD. The results seem good and in better agreement with other literatures.

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