Resonant tunneling between heavy-hole and light-hole states in coupled quantum wells

1991 ◽  
Vol 43 (2) ◽  
pp. 1867-1870 ◽  
Author(s):  
T. B. Norris ◽  
N. Vodjdani ◽  
B. Vinter ◽  
E. Costard ◽  
E. Böckenhoff
Keyword(s):  
Quantum Wells ◽  
Resonant Tunneling ◽  
Heavy Hole ◽  
Light Hole ◽  
Coupled Quantum Wells

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.

Luminescence studies of resonant tunneling in a triple barrier structure with strongly coupled quantum wells

1994 ◽  
Vol 37 (4-6) ◽  
pp. 721-724 ◽  
Author(s):  
T.S. Turner ◽  
P.M. Martin ◽  
L. Eaves ◽  
H.B. Evans ◽  
P.A. Harrison ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Resonant Tunneling ◽  
Barrier Structure ◽  
Coupled Quantum Wells ◽  
Strongly Coupled

Resonant tunneling spectroscopy of two coupled quantum wells

1989 ◽  
Vol 39 (2) ◽  
pp. 1375-1377 ◽  
Author(s):  
Yasuhito Zohta ◽  
Tetsuro Nozu ◽  
Masao Obara
Keyword(s):  
Quantum Wells ◽  
Resonant Tunneling ◽  
Tunneling Spectroscopy ◽  
Coupled Quantum Wells

Exciton Transitions in Narrow GaAs/AlxGal-x As Quantum Wells

1992 ◽  
Vol 261 ◽  
Author(s):  
O. L. Russo ◽  
V. Rehn ◽  
T. W. Nee ◽  
T. L. Cole ◽  
W. M. Theis ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Room Temperature ◽  
Light Hole ◽  
Close Coupling ◽  
Electric Field Effects ◽  
Coupled Quantum Wells ◽  
Confining Potential ◽  
First Approximation ◽  
Hole Conduction ◽  
Interfacial Charge

ABSTRACTElectroreflectance (ER) measurements were made on GaAs/AxGal-x As coupled quantum wells at room temperature and at 77K. The close coupling of the narrow (28.3 A) barriers resulted in splitting of the hole and electron subband levels which was observed at both temperatures. As a first approximation, the confining potential was assumed to be due to the barrier alone; electric field effects of the modulating potential and trapped interfacial charge were considered to be negligible. The dominant heavy holeconduction and light hole-conduction transitions observed at 300K were at 1523meV and 1539 meV respectively, although other weaker transitions were also resolved.

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.

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
Sign in / Sign up

Export Citation Format

Share Document