Donor impurity states and related terahertz range nonlinear optical response in GaN cylindrical quantum wires: Effects of external electric and magnetic fields
- Departamento de Ciencias Básicas, Universidad de Medellín, Medellín (Colombia)
- Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín (Colombia)
We report a study on the optical absorption coefficient associated to hydrogenic impurity interstate transitions in zinc-blende GaN quantum wires of cylindrical shape taking into account the effects of externally applied static electric and magnetic fields. The electron states emerge within the effective mass approximation, via the exact diagonalization of the donor-impurity Hamiltonian with parabolic confinement and external field effects. The nonlinear optical absorption is calculated using a recently derived expression for the dielectric susceptibility, obtained via a nonperturbative solution of the density-matrix Bloch equation. Our results show that this treatment eliminates not only the intensity-dependent bleaching effect but also the change in sign of the nonlinear contribution due to the combined effect of asymmetric impurity location and the applied electric field.
- OSTI ID:
- 22304211
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION
APPROXIMATIONS
ASYMMETRY
BLOCH EQUATIONS
CONFINEMENT
CYLINDRICAL CONFIGURATION
DENSITY MATRIX
DIELECTRIC MATERIALS
EFFECTIVE MASS
ELECTRIC FIELDS
GALLIUM NITRIDES
HAMILTONIANS
HYDROGEN ADDITIONS
IMPURITIES
MAGNETIC FIELDS
MAGNETIC SUSCEPTIBILITY
NONLINEAR OPTICS
NONLINEAR PROBLEMS
QUANTUM WIRES
ZINC SULFIDES