Search
Now showing items 1-10 of 27
The effect of intense laser field on the photoionization cross-section and binding energy of shallow donor impurities in graded quantum-well wire under an electric field
(IOP PUBLISHING LTD, 2006)
The laser-field dependence of the impurity binding energy and donor-related photoionization cross-section in graded quantum-well wire under an external static electric field is calculated by a variational method and in the ...
Broadband staircase quantum well infrared photodetector: working in long wavelength infrared range (LWIR)
(WILEY-V C H VERLAG GMBH, 2007)
We present a theoretical investigation of a staircase-like quantum well infrared photodetector (QWIP). it detects wavelength between 7.6 mu m and 13.5 mu m range at an applied electric field of F = 1.9x10(4) V/cm at 77 K. ...
Barrier height effect on binding energies of shallow hydrogenic impurities in coaxial GaAs/AlxGa1-xAs quantum well wires under a uniform magnetic field
(ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD, 2007)
The ground state binding energies of axial hydrogenic impurities in a coaxial cylindrical quantum well wire are reported as a function of the barrier height and the radius of wire in the presence of a uniform magnetic field ...
Ground state energy of excitons in quantum dot treated variationally via Hylleraas-like wavefunction
(IOP PUBLISHING LTD, 2009)
In this work, the effects of quantum confinement on the ground state energy of a correlated electron-hole pair in a spherical and in a disc-like quantum dot have been investigated as a function of quantum dot size. Under ...
Tunable long-wavelength broad band asymmetric quantum well infrared photodetector
(IOP PUBLISHING LTD, 2007)
We present a theoretical investigation of a GaAs/AlGaAs infrared detector consisting of three asymmetric quantum wells. Each well is designed to yield absorption and a photoresponse at peak wavelengths of 8.2 mu m, 9.5 mu ...
Shallow donors in a coupled triple graded quantum well under the electric and magnetic fields
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2006)
The binding energy of the donor in three different shaped triple graded GaAs-(Ga, Al)As quantum wells which is obtained by changing the depth of the central-well potential (V-o) is calculated by using a variational approach. ...
ELECTRONIC STRUCTURE AND BAND BENDING OF MODULATION-DOPED GaAs/Al-x Ga1-xAs SYMMETRIC AND ASYMMETRIC DOUBLE QUANTUM WELLS UNDER AN APPLIED ELECTRIC FIELD
(WORLD SCIENTIFIC PUBL CO PTE LTD, 2009)
In this study, we have calculated theoretically the effects of the electric field and doping concentration on the sub-band energies, the electron population, and total charge density in modulation-doped symmetric and ...
Magnetic-field effect on the diamagnetic susceptibility of hydrogenic impurities in quantum well-wires
(ELSEVIER SCIENCE BV, 2009)
We have studied the magnetic field effects on the diamagnetic susceptibility and binding energy of a hydrogenic impurity in a quantum well-wire by taking into account spatially dependent screening. Using the effective-mass ...
Binding energies of donor impurities in modulation-doped GaAs/AlxGa1-xAs double quantum wells under an electric field
(ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD, 2009)
In this study, we have investigated theoretically the binding energies of shallow donor impurities in modulation-doped GaAs/Al0.33Ga0.67 As double quantum wells (DQWs) under an electric field which is applied along the ...
Magnetoexciton binding energies for parabolic confinement in cylindrical quantum wire structures
(ELSEVIER SCIENCE BV, 2008)
In this work, using the effective mass approximation within variational approach, we have studied the behavior of the excitonic binding energies in a cylindrical quantum wire with a parabolic confinement under the effect ...