Abstract
In this work, we have studied the effects of the number of wells, quantum dot thickness, and dielectric mismatch on binding energy of a single-donor impurity which confined in GaAs constant total effective radius multi-shell quantum dots. We have found an oscillating binding energy when numbers of wells increase. Oscillations of 1s and 2s binding energies have 180° phase difference, while 1s and 3s binding energies oscillate in phase. When outer quantum dot radius R 2 increases, the amplitudes of the oscillations decreases, while by going from 1s to 3s, the amplitudes of the oscillations increase. When ɛ 2/ɛ 0 increases, the impurity binding energy decreases. Finally, we have shown that effect of the dielectric mismatch is larger for systems with smaller outer quantum dot radius R 2.
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References
Bastard G (1981) Hydrogenic impurity states in a quantum well: a simple model. Phys Rev B 24:4714
Bryant GW (1985) Hydrogenic impurity states in quantum-well wires: shape effects. Phys Rev B 31:7812
Kazaryan EM, Petrosyan LS, Sarkisyan HA (2003) Impurity states in a narrow band gap semiconductor quantum dot with parabolic confinement potential. Phys E 16:174
Li S-S, Xia J-B (2007) Binding energy of a hydrogenic donor impurity in a rectangular parallelepiped-shaped quantum dot: quantum confinement and stark effects. J Appl Phys 101:093716
Liu ZP, Li TK (1985) Hydrogenic impurity states in GaAs-Ga1-xAlx as quantum well structures. J Phys C Solid State Phys 18:691
Movilla JL, Planelles J (2005) Off-centering of hydrogenic impurities in quantum dots. Phys Rev B 71:075319
Niculescu EC (2011) Dielectric mismatch effect on the photoionization cross section and intersublevel transitions in GaAs nanodots. Opt Commun. 284:3298
Porras-Montenegro N, Perez-Merchancano ST (1992) Hydrogenic impurities in GaAs-(Ga, Al) as quantum dots. Phys Rev B 46:9780
Press WH, Teukolsky SA, Vetterling WT, Flanner BP (2007) Numerical recipes, 3rd Edn edn. Cambridge University Press, Cambridge
Shi JM, Peeters FM (1994) Shallow donor impurities in GaAs/Al x Ga1–x As superlattices in a magnetic field. Phys Rev B 50:15182
Sivakami A, Gayathri V (2013) Hydrostatic pressure and temperature dependence of dielectric mismatch effect on the impurity binding energy in a spherical quantum dot. Superlattices Microstruct 58:218
Solaimani M (2014a) Refractive index changes in constant total effective length GaN/AlN multiple quantum well systems under external electric field. Int J Mod Phys B 28:1450204
Solaimani M (2014b) GaN/AlN constant total effective radius multi-wells quantum rings: physical properties under well number variation effects. Solid State Commun 200:66
Solaimani M (2014c) Nonlinear optical absorption of a two electron GaN/AlN constant total effective radius multi-shells quantum rings. J Nonlinear Opt Phys Mater 23:1450049
Solaimani M, Izadifard M, Arabshahi H, Sarkardei MR (2013a) Study of optical non-linear properties of a constant total effective length multiple quantum wells system. J Lumin 134:699
Solaimani M, Izadifard M, Arabshahi H, Sarkardei MR (2013b) Effect of the magnetic field on optical properties of GaN/AlN multiple quantum wells. J Lumin 134:88
Solaimani M, Izadifard M, Arabshahi H, Sarkardei MR (2013c) Magnetic field dependence optical properties of GaN/AlN multiple quantum wells. Optik 124:3194
Zhu JL, Chen X (1994a) Spectrum and binding of an off-center donor in a spherical quantum dot. Phys Rev B 50:4497
Zhu JL, Chen X (1994b) Spectrum and binding of an off-center donor in a spherical quantum dot. Phys Rev B 50:4497
Zhu J-L, Xiong J-J, Gu B-L (1990) Confined electron and hydrogenic donor states in a spherical quantum dot of GaAs-Ga1–x Al x As. Phys Rev B 41:6001
Zhu JL, Zhao JH, Xiong JJ (1994) Dimensionality and potential-shape effects on D0 and D− ground states in quantum dots. Phys Rev B 50:1832
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We are grateful for the financial support of the Iranian Nanotechnology Initiative Council (INIC) and Qom University of Technology supports.
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Solaimani, M., Babayar Razlighi, B. Behavior of Donor Impurity Binding Energy Confined In a GaAs Constant Total Effective Radius Multi-Shell Quantum Dots: Dielectric Mismatch Effects. Iran J Sci Technol Trans Sci 41, 1075–1081 (2017). https://doi.org/10.1007/s40995-017-0341-7
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DOI: https://doi.org/10.1007/s40995-017-0341-7