D− Impurities in a Quasi-Two-Dimensional System: Statistics and Screening

1993 ◽  
Vol 325 ◽  
Author(s):  
W. J. Li ◽  
J. L. Wang ◽  
J.-P. Cheng ◽  
S. Holmes ◽  
Y. J. Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Electron Density ◽  
Transition Energy ◽  
Far Infrared ◽  
Spectroscopic Studies ◽  
Excess Electron ◽  
Dimensional System ◽  
Triplet States ◽  
Electron Densities

AbstractFar infrared spectroscopic studies of electron-density- and magnetic-field-dependenceof manyelectron effects on silicon donor impurities confined in GaAs quantum wells are presented. At low excess electron densities, transitions from D− singlet and triplet states are observed. Temperature- and polarization-dependence measurements show that the relative absorption strengths of various spectroscopic features (D0, D−, and CR) are in qualitative agreement with a statistical calculation in thermal equilibrium in high magnetic fields. At large excess electron densities, the “D−” transition energy shifts to higher energy when electron density is increased, and the magnetic-field dependence of the transition energy exhibits discontinuities in slope at integer filling factors. The spectroscopic features and their relation to excess free carriers and the role of screening and correlation are presented and discussed.

Polarization-Sensitive Fourier-Transform Spectroscopy of HgTe/CdHgTe Quantum Wells in the Far Infrared Range in a Magnetic Field

JETP Letters ◽  
2018 ◽  
Vol 108 (5) ◽  
pp. 329-334 ◽  
Author(s):  
L. S. Bovkun ◽  
A. V. Ikonnikov ◽  
V. Ya. Aleshkin ◽  
S. S. Krishtopenko ◽  
N. N. Mikhailov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fourier Transform ◽  
Quantum Wells ◽  
Far Infrared ◽  
Fourier Transform Spectroscopy ◽  
Infrared Range

Far-infrared laser photoconductivity of n-GaAs multiple quantum wells in a pulsed magnetic field

1998 ◽  
Vol 246-247 ◽  
pp. 290-293 ◽  
Author(s):  
R.J. Heron ◽  
R.A. Lewis ◽  
A.V. Skougarevsky ◽  
R.P. Starrett ◽  
R.G. Clark ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Far Infrared ◽  
Infrared Laser ◽  
Pulsed Magnetic Field ◽  
Multiple Quantum Wells ◽  
Multiple Quantum ◽  
Far Infrared Laser

scholarly journals Some Experimental Prospects involving Parabolic Quantum Wells

2000 ◽  
Vol 53 (1) ◽  
pp. 119 ◽  
Author(s):  
John F. Dobson ◽  
Jun Wang ◽  
Hung M. Le
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Van Der Waals ◽  
Far Infrared ◽  
Narrow Resonance ◽  
First Approximation ◽  
Spring Balance ◽  
Electron Layer ◽  
Parabolic Confinement ◽  
Parabolic Quantum Wells

We discuss two possible lines of experimental investigation based on parabolic quantum wells. In the first proposal, we note that the Generalised Kohn Theorem/Harmonic Potential Theorem forbids electron–electron damping of the Kohn mode in an electron layer gas under strictly parabolic confinement. This applies even for very strong driving. It is therefore interesting to attempt reduction of other sources of broadening in GaAlAs parabolic wells, so as to achieve a prominent narrow resonance in the far infrared. We concentrate here on phononic bandgap structures, which may be of interest for reduction of phonon effects in other systems as well. The second class of proposed experiment involves twinned parabolic wells in an attempt to observe van der Waals forces directly in GaAlAs systems. In a first approximation, the parabolic or Hooke's-law nature of the confinement allows one to use the well as a kind of spring balance to measure the weak van der Waals force. The influence of an applied magnetic field on these forces appears to be significant, and this system might provide the first measurement of such an effect.

Evolution of GaAs quantum well excitons with excess electron density and magnetic field

1996 ◽  
Vol 40 (1-8) ◽  
pp. 275-280 ◽  
Author(s):  
A.J. Shields ◽  
M. Pepper ◽  
M.Y. Simmons ◽  
D.A. Ritchie
Keyword(s):  
Magnetic Field ◽  
Quantum Well ◽  
Electron Density ◽  
Excess Electron

TEMPERATURE AND MAGNETIC FIELD INDUCED BANDSTRUCTURE REVERSAL IN GaSb/AlSb QUANTUM WELLS

1987 ◽  
Vol 48 (C5) ◽  
pp. C5-159-C5-162
Author(s):  
A. FORCHEL ◽  
U. CEBULLA ◽  
G. TRÄNKLE ◽  
W. OSSAU ◽  
G. GRIFFITHS ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Wells

FAR INFRARED MAGNETO-ABSORPTION STUDY OF BARRIER IMPURITIES AND SCREENING IN GaAs/AlGaAs MULTIPLE QUANTUM WELLS

1987 ◽  
Vol 48 (C5) ◽  
pp. C5-239-C5-242 ◽  
Author(s):  
E. GLASER ◽  
B. V. SHANABROOK ◽  
R. J. WAGNER ◽  
R. L. HAWKINS ◽  
W. J. MOORE ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Far Infrared ◽  
Multiple Quantum Wells ◽  
Multiple Quantum ◽  
Absorption Study
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