Donor impurity binding energies of coaxialGaAs/AlxGa1−xAscylindrical quantum wires in a parallel applied magnetic field

2018 ◽  
Vol 116 ◽  
pp. 227-237 ◽  
Author(s):  
M. Tshipa ◽  
D.P. Winkoun ◽  
N. Nijegorodov ◽  
M. Masale
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Quantum Wires ◽  
Binding Energies ◽  
Donor Impurity

Binding energies and photoionization cross-sections of donor and acceptor impurities in inverted core/shell ellipsoidal quantum dots: Effects of magnetic field, ellipsoid anisotropy and impurity position

2019 ◽  
Vol 33 (13) ◽  
pp. 1950131 ◽  
Author(s):  
Lei Shi ◽  
Zu-Wei Yan
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Cross Section ◽  
Cross Sections ◽  
Applied Magnetic Field ◽  
Photoionization Cross Section ◽  
Binding Energies ◽  
Core Shell ◽  
Perturbation Approach ◽  
Donor And Acceptor

Within the framework of the effective-mass approximation and by using a variational and perturbation approach, the binding energies and photoionization cross-sections of donor and acceptor impurities in an inverted core/shell ellipsoidal spherical quantum dot under an applied magnetic field have been studied. We have calculated the binding energies of both donor and acceptor impurities as a function of the core and shell sizes and shapes with different impurity positions under the applied magnetic field. In addition, the corresponding photoionization cross-section is calculated. Our results show that the binding energy of the acceptor impurity is larger than that of the donor impurity, and both of them with different impurity positions and quantum ellipsoid anisotropies will exhibit a nonmonotonic change. The peak value of the photoionization cross-section will reach a maximum with the increasing ratio R1/R2. It is found that the applied magnetic field can be an effective means of enhancing the photoionization cross-section of an impurity state in such core/shell quantum dot system.

Energy Spectra of CdS/Cd1-xZnx S Nano Dot Under The Influence of Magnetic Field

2014 ◽  
Vol 4 (1) ◽  
pp. 460-466
Author(s):  
P. Elangovan ◽  
M. Balakumari ◽  
A. Milton Franklin Benial
Keyword(s):  
Magnetic Field ◽  
Effective Mass ◽  
Applied Magnetic Field ◽  
Theoretical Study ◽  
Shallow Donor ◽  
Binding Energies ◽  
Energy Spectra ◽  
Mass Approximation ◽  
Zn Concentration ◽  
Frame Work

We present a theoretical study on shallow donor binding energies of CdS/ CdZnS nano dot as a strength of  applied magnetic field along Z direction for various Zn concentration. Calculations are carried out by using the technique of variational ansatz within the frame work of effective mass approximation. Our results show that the binding energies are drastically affected by the dot radius, the strength of magnetic field and concentrations.

scholarly journals Many-body Spin Interactions in Semiconductor Quantum Wires

2000 ◽  
Vol 53 (4) ◽  
pp. 543 ◽  
Author(s):  
D. J. Reilly ◽  
L. N. Pfeiffer ◽  
G. R. Facer ◽  
K. W. West ◽  
A. S. Dzurak ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Quantum Wires ◽  
Zero Magnetic Field ◽  
Point Contacts ◽  
Many Body ◽  
Temperature Dependent ◽  
Modulation Doping ◽  
Dominant Mechanism ◽  
Spin Interactions

Zero length quantum wires (or point contacts) exhibit unexplained conductance structure close to 0.7 � 2e 2 /h in the absence of an applied magnetic field. We have studied the density- and temperature-dependent conductance of ultra-low-disorder GaAs/AlGaAs quantum wires with nominal lengths l=0 and 2�m, fabricated from structures free of the disorder associated with modulation doping. In a direct comparision we observe structure near 0.7 � 2e 2 /h for l = 0, whereas thel = 2�m wires show structure evolving with increasing electron density to 0.5 � 2e 2 /h in zero magnetic field, the value expected for an ideal spin-split sub-band. Our results suggest the dominant mechanism through which electrons interact can be strongly affected by the length of the 1D region.

Sign in / Sign up

Export Citation Format

Share Document