Donor impurity states in a non-uniform quantum strip: Geometrical and electro-magnetic field effects

• Published in: Superlattices and microstructures 2017-03, Vol.103, p.127-138
• Main Authors: Suaza, Y.A., Fonnegra-García, D., Fulla, M.R., Salazar-Santa, J.D., Marín, J.H.
• Format: Article
• Language: English
• Subjects: Aharonov-Bohm oscillations; Anti-crossing levels structure; Neutral donors; Non-uniform height; Quantum strip
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1016/j.spmi.2017.01.019

The neutral donor energy structure in non-uniform height quantum strip under the presence of crossed electric and magnetic fields is studied. The quantum strip height has been modeled by including a phenomenological two-parametric function. The first of these parameters is related to the number of structural hills present on the nano-strip, while the second one allows us to control the hills height. We solve the Schrödinger equation by considering specific quantum strips whose height-to-base aspect ratio is very small, which makes possible to calculate numerically the energy structure trough the adiabatic approximation and the exact diagonalization method. In limit cases, our results are in good agreement with those ones previously reported. Periodic oscillations of the ground state energy with magnetic field strength can be tuned by applied electric field which also yields an anti-crossing of the energy levels in a quantum strip with two hills. The energy level structure are strongly sensitive to changes of nano-strip geometrical factors. •Off-axis D0 energy structure in a non-uniform quantum strip under electric and magnetic fields was calculated.•Proper values of the electric field for tuning and detuning Aharanov-Bohm oscillations were determined.•The Aharanov-Bohm pattern is strongly dependent on quantum strip hills number.•The Stark-like pattern is closely related to the donor position and the quantum strip radius.