Stark shift of hydrogenic and non-hydrogenic donor impurity excited states in parabolic quantum dot: Under the effect of electric field and temperature

Safwan, S.A.; Meshad, Nagwa El; Saleh, Assma; Hassanein, Hekmat M.

doi:10.1016/j.physe.2019.113882

Cited by 5 publications

(2 citation statements)

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“…Also, we notice that the limit of the lateral electric field (θ=π/2) has a remarkable effect on the binding energies of the D 0 states in both confinement regions compared with the normal electric field (θ=0), this is because the lateral electric field breaks the wave symmetry of the electron in the in-plan and the state with angular momentum m>0; 1p state is tunneling this leads to the state of D 0 is an unstable state. This is in good agreement with our previous results [30], which showed that the carriers confined in the nanostructures are affected by the small values of the lateral electric field compared with the normal electric field. From this regard, we notice that our…”

Section: Resultssupporting

confidence: 93%

“…Through the following calculations, we used GaAs/Al 0.35 GaAs 0.65 parameters mentioned in [30]. To examine the on-and off-center neutral donor impurity stability under the effect of the tilted electric field, we calculated the binding energies of the ground and the low lying excited states for the on-and off-center D 0 , figures 2 and 3 respectively.…”

Section: Resultsmentioning

confidence: 99%

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Effect of tilted electric field on stability of excited states of neutral donor impurity in semiconductor quantum wire

Safwan¹,

Meshad²,

Saleh³

et al. 2020

Phys. Scr.

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The influence of the tilted electric field on the stability of the excited states of neutral donor impurity (D0) in a cylindrical quantum wire (CQW) is investigated. We consider the finite parabolic confinement potential in the CQW. The energies and wave functions for the on- and off-center D0 states are calculated using the variational principle within the single-band effective mass approximation. Moreover, the dependence of Stark shift ΔE in the ground and excited state energies of D0 on the tilted electric field are obtained. The tilted electric field strength is found to have a certain angle at which the states of D0 turn from bound to unbound. For the off-center donor impurity in the intermediate region of the angle, the binding energy of D0 descends rapidly in both the strong and weak confinement regions, and it increases again in the limit of the total lateral electric field. Moreover, our results show a reordering of the on- and off-center D0 energy states when moving from the strong confinement region towards the weak confinement region. The ground state of the off-center D0 loses its stability, faster in the tilted electric field than both the normal and the total lateral electric fields. The Stark shift in D0 shows a blue shift, and in some states of D0, it increases quadratically with the enhancement in the tilted electric field.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%