Electronic and optical properties of a circular graphene quantum dot in a magnetic field: Influence of the boundary conditions

2011 ◽  
Vol 84 (20) ◽  
Author(s):  
M. Grujić ◽  
M. Zarenia ◽  
A. Chaves ◽  
M. Tadić ◽  
G. A. Farias ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Quantum Dot ◽  
Boundary Conditions ◽  
Graphene Quantum Dot ◽  
Electronic And Optical Properties ◽  
Field Influence

scholarly journals Electronic states and optical transitions in a graphene quantum dot in a normal magnetic field

2011 ◽  
Vol 8 (1) ◽  
pp. 53-62 ◽  
Author(s):  
Marko Grujic ◽  
Milan Tadic
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Boundary Conditions ◽  
Zero Energy ◽  
Graphene Quantum Dot ◽  
Infinite Mass ◽  
Infinite Mass Boundary Conditions ◽  
The Magnetic Field ◽  
Normal Magnetic Field ◽  
Weyl Equation

An analytical approach using the Dirac-Weyl equation is implemented to obtain the energy spectrum and optical absorption of a circular graphene quantum dot in the presence of an external magnetic field. The results are obtained for the infinite-mass and zigzag boundary conditions. We found that the energy spectra of a dot with zigzag boundary condition exhibit a zero energy band regardless of the value of the magnetic field, while for the infinite mass boundary conditions, the zero energy states appear only for high magnetic fields.

MAGNETIC FIELD, PRESSURE AND TEMPERATURE DEPENDENT OPTICAL PROPERTIES IN A GaAs 9.0 P 1.0 QUANTUM DOT

2014 ◽  
Vol 6 (2) ◽  
pp. 1178-1190
Author(s):  
A. JOHN PETER ◽  
Ada Vinolin
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Quantum Dot ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Photon Energy ◽  
Nonlinear Optical ◽  
Binding Energies ◽  
Nonlinear Optical Properties ◽  
Optical Rectification

Simultaneous effects of magnetic field, pressure and temperature on the exciton binding energies are found in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot. Numerical calculations are carried out taking into consideration of spatial confinement effect. The cylindrical system is taken in the present problem with the strain effects. The electronic properties and the optical properties are found with the combined effects of magnetic field strength, hydrostatic pressure and temperature values. The exciton binding energies and the nonlinear optical properties are carried out taking into consideration of geometrical confinement and the external perturbations.Compact density approach is employed to obtain the nonlinear optical properties. The optical rectification coefficient is obtained with the photon energy in the presence of pressure, temperature and external magnetic field strength. Pressure and temperature dependence on nonlinear optical susceptibilities of generation of second and third order harmonics as a function of incident photon energy are brought out in the influence of magnetic field strength. The result shows that the electronic and nonlinear optical properties are significantly modified by the applications of external perturbations in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot.

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