PLASMONS AND SINGLE PARTICLE EXCITATIONS IN MODULATION DOPED QUANTUM WELLS

1987 ◽  
Vol 48 (C5) ◽  
pp. C5-581-C5-584
Author(s):  
G. FASOL ◽  
N. MESTRES ◽  
M. DOBERS ◽  
A. FISCHER ◽  
K. PLOOG
Keyword(s):  
Quantum Wells ◽  
Single Particle

Single-particle and transport scattering times in narrow GaAs/AlxGa1−xAs quantum wells

1990 ◽  
Vol 41 (11) ◽  
pp. 7864-7867 ◽  
Author(s):  
U. Bockelmann ◽  
G. Abstreiter ◽  
G. Weimann ◽  
W. Schlapp
Keyword(s):  
Quantum Wells ◽  
Single Particle

scholarly journals Intersubband electronic Raman scattering in narrow GaAs single quantum wells dominated by single-particle excitations

2004 ◽  
Vol 70 (15) ◽  
Author(s):  
Takeya Unuma ◽  
Kensuke Kobayashi ◽  
Aishi Yamamoto ◽  
Masahiro Yoshita ◽  
Yoshiaki Hashimoto ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Quantum Wells ◽  
Single Particle ◽  
Single Quantum ◽  
Electronic Raman Scattering

Single Carrier Resonant Tunneling Design for Improving Carrier Collection in Quantum Confined Solar Cells

2008 ◽  
Vol 1102 ◽  
Author(s):  
Andenet Alemu ◽  
Alex Freundlich
Keyword(s):  
Solar Cells ◽  
Quantum Wells ◽  
Single Particle ◽  
Strong Dependence ◽  
Special Property ◽  
Device Performance ◽  
Material System ◽  
High Electron ◽  
Escape Probability ◽  
Quantum Confined

AbstractPromising nanostructured device concepts with staggering theoretical efficiencies where quantum confined states are embedded in the intrinsic region of conventional p-i-n solar cells have been proposed. However, practical realizations remain inefficient as these devices suffer from an inherent difficulty in the extraction of photo-generated carriers from the confined states. Within the framework of a “single particle in the box” theory, such shortcomings could be addressed by the use of resonant quantum tunneling designs that can expedite carrier escape. Nonetheless, in material systems studied thus far, the implementation of such design becomes elusive as band offsets between the nanostructure and the host material are distributed between the conduction and valence band leading to the confinement of both holes and electrons (i.e. two particle problem). Our studies of such p-i-n Multi-Quantum Well (MQW) solar cells, only differing by their MQW region composition and geometry, have shown a strong dependence of device performance on quantum wells composition and thickness. Leveraging on the special property of dilute nitrides and using a carefully chosen material system and device design we show the possibility of circumventing this problem by separating the optimization of the valence and conduction band and reducing the issue to a single particle problem. Band structure calculations including strain effects, band anti-crossing models and transfer matrix methods are used to theoretically demonstrate optimum conditions for enhanced vertical transport. High electron tunneling escape probability, together with a free movement of quasi-3 D holes, is predicted to result in enhanced PV device performance. Furthermore, the increase in electron effective mass due to the incorporation of N translates in enhanced absorptive properties, ideal for PV application.

Determination of single-particle relaxation time from light scattering spectra in modulation-doped quantum wells

1987 ◽  
Vol 36 (3) ◽  
pp. 1565-1569 ◽  
Author(s):  
G. Fasol ◽  
N. Mestres ◽  
M. Dobers ◽  
A. Fischer ◽  
K. Ploog
Keyword(s):  
Relaxation Time ◽  
Light Scattering ◽  
Quantum Wells ◽  
Single Particle ◽  
Scattering Spectra

Collective and single-particle intersubband excitations in narrow quantum wells selected by infrared absorption and resonant Raman scattering

2006 ◽  
Vol 74 (19) ◽  
Author(s):  
Takeya Unuma ◽  
Kensuke Kobayashi ◽  
Aishi Yamamoto ◽  
Masahiro Yoshita ◽  
Kazuhiko Hirakawa ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Quantum Wells ◽  
Infrared Absorption ◽  
Single Particle ◽  
Resonant Raman ◽  
Resonant Raman Scattering

EFFECTS OF IONIZED IMPURITIES ON BINDING AND RECOMBINATION OF POSITIVE AND NEGATIVE QUASI-TWO-DIMENSIONAL MAGNETO-TRIONS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2964-2968
Author(s):  
ARKADIUSZ WÓJS ◽  
LESZEK BRYJA ◽  
MAREK POTEMSKI
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Single Particle ◽  
Quantitative Description ◽  
Normal Direction ◽  
Binding Energies ◽  
Landau Levels ◽  
High Magnetic Fields ◽  
Two Dimensional ◽  
Coulomb Interactions

Binding energies of negative and positive trions in high magnetic fields are compared. Simultaneous inclusion of several Landau levels and quantum well subbands in exact numerical diagonalization allowed quantitative description of the coupling between in-plane dynamics (governed by interplay of cyclotron quantization and Coulomb interactions) and single-particle excitations in the normal direction. Symmetric and asymmetric GaAs quantum wells of different widths were considered, as well as the effect of a possible binding of trions by sparse ionized impurities nearby the quantum well.

Single-particle Nature of Intersubband Electronic Raman Scattering and Dynamical Many-body Effects in Narrow GaAs Quantum Wells

2007 ◽  
Author(s):  
Takeya Unuma ◽  
Kensuke Kobayashi ◽  
Aishi Yamamoto ◽  
Masahiro Yoshita ◽  
Kazuhiko Hirakawa ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Quantum Wells ◽  
Single Particle ◽  
Many Body ◽  
Electronic Raman Scattering ◽  
Many Body Effects ◽  
Particle Nature
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