Impurity-related photoionization cross section in a pyramid-shaped quantum dot: Intense laser field and hydrostatic pressure effects

2014 ◽  
Vol 63 ◽  
pp. 105-113 ◽  
Author(s):  
E.C. Niculescu
Keyword(s):  
Hydrostatic Pressure ◽  
Quantum Dot ◽  
Cross Section ◽  
Laser Field ◽  
Photoionization Cross Section ◽  
Pressure Effects ◽  
Intense Laser ◽  
Intense Laser Field

DONOR AND ACCEPTOR STATES IN GaAs-(Ga, Al)As QUANTUM DOTS: EFFECTS OF HYDROSTATIC PRESSURE AND AN INTENSE LASER

2010 ◽  
Vol 24 (29) ◽  
pp. 5761-5770 ◽  
Author(s):  
A. MIGUEZ ◽  
R. FRANCO ◽  
J. SILVA-VALENCIA
Keyword(s):  
Quantum Dots ◽  
Hydrostatic Pressure ◽  
Binding Energy ◽  
Laser Field ◽  
Binding Energies ◽  
Field Amplitude ◽  
Pressure Effects ◽  
Intense Laser ◽  
Mass Approximation ◽  
Donor And Acceptor

We calculated the binding energies of shallow donors and acceptors in a spherical GaAs - Ga 1-x Al x As quantum dot under the combined effect of isotropic hydrostatic pressure and an intense laser. We used a variational approach within the effective mass approximation. The binding energy was computed as a function of hydrostatic pressure, dot sizes and laser field amplitude. The results showed that the impurity binding energy increases with pressure and decreases with the laser field amplitude when other parameters are fixed. We also found that the pressure effects are more dramatic for donor than acceptor impurities, especially for quantum dots with small radii.

Sign in / Sign up

Export Citation Format

Share Document