Investigating Absorption Cross Section and Oscillator Strength for Double Quantum Well with Pöschl-Teller Potential

2021 ◽  
pp. 9-18
Author(s):  
Arpan Deyasi ◽  
Suporna Bhowmick ◽  
Pampa Debnath ◽  
Angsuman Sarkar
Keyword(s):  
Quantum Well ◽  
Oscillator Strength ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Double Quantum ◽  
Absorption Cross ◽  
Double Quantum Well

Sign of the Piezoelectric Field in Asymmetric GaInN/AlGaN/GaN Single and Double Quantum Wells on SiC

1999 ◽  
Vol 595 ◽  
Author(s):  
Jin Seo Im ◽  
A. Hangleiter ◽  
J. Off ◽  
F. Scholz
Keyword(s):  
Quantum Well ◽  
Quantum Wells ◽  
Oscillator Strength ◽  
Double Quantum ◽  
Barrier Structure ◽  
Time Resolved ◽  
Double Quantum Well ◽  
First Case ◽  
Algan Barrier ◽  
Piezoelectric Field

AbstractWe study both GaInN/GaN/AlGaN quantum wells with an asymmetric barrier structure grown on SiC substrate and GaN/AlGaN asymmetric double quantum well (ADQW) structures. In the first case, a time-resolved study reveals an enhanced oscillator strength when the AlGaN barrier is on top of the GaInN quantum well. In comparison to our previous study of the same structure grown on sapphire, we find that the sign of the field is the same in both cases: the field points towards the substrate. In the case of ADQW, we observed not only intrawell transitions of both a 4 nm and a 2 nm QW separated by a 2.5 nm AlGaN barrier but also an interwell transition between the two QWs in the photoluminescence. The lifetimes and emission energies of the transitions can be well explained by the existence of the piezoelectric field built in the QWs.

scholarly journals Optical Absorption Cross-Section of DNA Bases—Thymine and Guanine—in the Energy Region from 3.1 to 250 eV (5–400 nm)

2020 ◽  
Vol 4 (3) ◽  
pp. 30
Author(s):  
Kaveenga Rasika Koswattage ◽  
Yudai Izumi ◽  
Kazumichi Nakagawa
Keyword(s):  
Optical Absorption ◽  
Oscillator Strength ◽  
Absorption Spectra ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Energy Region ◽  
Strength Distribution ◽  
Dna Bases ◽  
Absorption Cross ◽  
Radiation Chemical

(1) Background: Optical absorption cross-section—the absolute absorption intensity specific to each molecule—of nucleic acid bases enables us to estimate the reaction yields of DNA lesions induced by the exposure to not only photons but also ionizing radiations. However, it was unknown in the energy region exceeding ~10 eV (wavelength < ~120 nm). (2) Methods: Thin films of DNA bases—thymine and guanine—were prepared using a vacuum sublimation technique. Absorption spectra of these films were measured in the energy region from 3.1 to 250 eV (5–400 nm) at the synchrotron radiation facility UVSOR. (3) Results: The absorption spectra of both bases exhibited prominent absorption peaks around 20 eV and smaller peaks in the energy region below 10 eV. The determined optical oscillator strength distribution was verified to be reasonable based on the Thomas–Reiche–Kuhn oscillator strength sum rule. (4) Conclusion: Most of the oscillator strength distribution was positioned in the measured energy region, and therefore the absorption spectra significantly contributed to the quantitative study for the photo and radiation-chemical reactions of DNA.

scholarly journals Photoelectric absorption cross section of silicon near the bandgap from room temperature to sub-Kelvin temperature

AIP Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 025120
Author(s):  
C. Stanford ◽  
M. J. Wilson ◽  
B. Cabrera ◽  
M. Diamond ◽  
N. A. Kurinsky ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Room Temperature ◽  
Absorption Cross ◽  
Photoelectric Absorption
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