Quantum beats of light hole and heavy hole excitons in quantum wells

1990 ◽  
Vol 57 (1) ◽  
pp. 19-21 ◽  
Author(s):  
Karl Leo ◽  
Theo C. Damen ◽  
Jagdeep Shah ◽  
Ernst O. Göbel ◽  
Klaus Köhler
Keyword(s):  
Quantum Wells ◽  
Heavy Hole ◽  
Light Hole ◽  
Quantum Beats

scholarly journals Valence Band Mixing in GaAs/AlGaAs Quantum Wells Adjacent to Self-Assembled InAlAs Antidots

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Takuya Kawazu
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Valence Band ◽  
Energy Barrier ◽  
Heavy Hole ◽  
Electronic States ◽  
Light Hole ◽  
Photoluminescence Excitation ◽  
Band Mixing ◽  
Valence Band Mixing

Optical properties of GaAs/AlGaAs quantum wells (QWs) in the vicinity of InAlAs quantum dots (QDs) were studied and compared with a theoretical model to clarify how the QD strain affects the electronic states in the nearby QW. In0.4Al0.6As QDs are embedded at the top of the QWs; the QD layer acts as a source of strain as well as an energy barrier. Photoluminescence excitation (PLE) measurements showed that the QD formation leads to the increase in the ratio Ie-lh/Ie-hh of the PLE intensities for the light hole (lh) and the heavy hole (hh), indicating the presence of the valence band mixing. We also theoretically calculated the hh-lh mixing in the QW due to the nearby QD strain and evaluated the PLE ratio Ie-lh/Ie-hh.

TERAHERTZ EMISSION FROM ELECTRICALLY PUMPED SILICON GERMANIUM INTERSUBBAND DEVICES

2007 ◽  
Vol 17 (01) ◽  
pp. 115-120
Author(s):  
N. Sustersic ◽  
S. Kim ◽  
P.-C. Lv ◽  
M. Coppinger ◽  
T. Troeger ◽  
...  
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Silicon Germanium ◽  
Heavy Hole ◽  
Light Hole ◽  
Spectral Lines ◽  
Intersubband Transitions ◽  
Terahertz Emission ◽  
Drive Current ◽  
Quantum Well Width

In this paper, we report on current pumped THz emitting devices based on intersubband transitions in SiGe quantum wells. The spectral lines occurred in a range from 5 to 12 THz depending on the quantum well width, Ge concentration in the well, and device temperature. A time-averaged power of 15 nW was extracted from a 16 period SiGe/Si superlattice with quantum wells 22 Å thick, at a device temperature of 30 K and a drive current of 550 mA. A net quantum efficiency of approximately 3 × 10-4 was calculated from the power and drive current, 30 times higher than reported for comparable quantum cascades utilizing heavy-hole to heavy-hole transitions and, taking into account the number of quantum well periods, approximately four times larger than for electroluminescence reported previously from a device utilizing light-hole to heavy-hole transitions.

Excitation-induced phase shifts of heavy- and light-hole quantum beats in GaAs/AlxGa1−xAs multiple quantum wells

1995 ◽  
Vol 51 (7) ◽  
pp. 4242-4246 ◽  
Author(s):  
A. E. Paul ◽  
W. Sha ◽  
Shekhar Patkar ◽  
Arthur L. Smirl
Keyword(s):  
Quantum Wells ◽  
Phase Shifts ◽  
Light Hole ◽  
Multiple Quantum Wells ◽  
Quantum Beats ◽  
Multiple Quantum

PHOTOCONDUCTIVITY, PHOTOREFLECTANCE AND PHOTOLUMINESCENCE OF GaAs-AlAs MULTIPLE QUANTUM WELLS

1985 ◽  
Vol 56 ◽  
Author(s):  
H. NEFF ◽  
K. J. BACHMANN ◽  
W. D. LAIDIG
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Heavy Hole ◽  
Multiple Quantum Well ◽  
Light Hole ◽  
Multiple Quantum ◽  
Indirect Transition ◽  
Temperature Dependent ◽  
Direct Inter ◽  
Phonon Absorption

AbstractEmploying temperature dependent photoconductivity, photoluminescence and photoreflectivity measurements, we have analyzed a GaAs-AlAs multiple quantum well. The above optical techniques clearly resolve the fundamental inter-subband transitions, including heavy hole-light hole splittings. At T < 60K an anomalously high photoconductivity was discovered below the direct inter-subband transitions and is attributed tentatively to the presence of extrinsic interface states within the bandgap. For T > l00K the fundamental indirect transition was discovered and associated with LO (L) - phonon absorption.

Differential spectroscopy of GaAs-Ga1−xAlxAs quantum wells: An unambiguous identification of light-hole and heavy-hole states

1987 ◽  
Vol 36 (12) ◽  
pp. 6581-6584 ◽  
Author(s):  
H. Mathieu ◽  
P. Lefebvre ◽  
J. Allegre ◽  
B. Gil ◽  
A. Regreny
Keyword(s):  
Quantum Wells ◽  
Heavy Hole ◽  
Light Hole ◽  
Differential Spectroscopy

Heavy-hole and light-hole oscillations in the coherent emission from quantum wells: Evidence for exciton-exciton correlations

1999 ◽  
Vol 60 (11) ◽  
pp. 8267-8275 ◽  
Author(s):  
Arthur L. Smirl ◽  
Martin J. Stevens ◽  
X. Chen ◽  
O. Buccafusca
Keyword(s):  
Quantum Wells ◽  
Heavy Hole ◽  
Light Hole ◽  
Coherent Emission
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