Effects of material intermixing on electronic energy levels in Ga(As)Sb/GaAs quantum dots

2016 ◽  
Author(s):  
Suwit Kiravittaya ◽  
Zon ◽  
Thanavorn Poempool ◽  
Supachok Thainoi ◽  
Songphol Kanjanachuchai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Electronic Energy ◽  
Electronic Energy Levels

Biologically Engineered Quantum Dots for Biomedical Applications

2008 ◽  
Vol 1095 ◽  
Author(s):  
Ganna Chornokur ◽  
Sergei Ostapenko ◽  
Yusuf Emirov ◽  
Nadezhda Korsunska ◽  
Abraham Wolcott ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Local Stress ◽  
Blue Shift ◽  
Spectral Shift ◽  
Electronic Energy ◽  
Transmission Electron ◽  
Solid Substrates ◽  
Electronic Energy Levels ◽  
Electrophoresis Technique

AbstractWe report on a short-wavelength, “blue” spectral shift of the photoluminescence (PL) spectrum in CdSeTe/ZnS core/shell quantum dots (QDs) caused by bioconjugation with several monoclonal cancer related antibodies (ABs). Scanning PL spectroscopy was performed on samples dried on solid substrates at various temperatures. The influence of the AB chemical origin on the PL spectral shift was observed. The conjugation QD-AB reaction was confirmed using the agarose gel electrophoresis technique. The spectral shift is strongly increased and the process facilitated when the samples are dried above room temperature. The PL spectroscopic mapping revealed a profile of the PL spectral shift across the dried QD-AB spot. Transmission Electron Microscopy analyses of the samples were performed to reveal the shape and size of individual QDs. A mechanism of the “blue” shift is attributed to changes in the QD electronic energy levels caused by local stress field applied to the bio-conjugated QD.

Electronic Energy Levels in an Asymmetric Quantum-Dots-in-a-Well Structure for Infrared Photodetectors

2008 ◽  
Vol 25 (7) ◽  
pp. 2645-2648 ◽  
Author(s):  
Wang Zhi-Cheng ◽  
Xu Bo ◽  
Chen Yong-Hai ◽  
Shi Li-Wei ◽  
Liang Zhi-Mei ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Electronic Energy ◽  
Infrared Photodetectors ◽  
Asymmetric Quantum ◽  
Electronic Energy Levels ◽  
Asymmetric Quantum Dots

A consolidated account of electrochemical determination of band structure parameters in II–VI semiconductor quantum dots: a tutorial review

2019 ◽  
Vol 21 (9) ◽  
pp. 4695-4716 ◽  
Author(s):  
Pravin Popinand Ingole
Keyword(s):  
Quantum Dots ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Energy Levels ◽  
Electrochemical Determination ◽  
Electronic Energy ◽  
Semiconductor Quantum Dots ◽  
Electronic Band ◽  
Nano Structure ◽  
Electronic Energy Levels

Probing absolute electronic energy levels in semiconductor quantum dots (Q-dots) is crucial for engineering their electronic band structure and hence for precise design of composite nano-structure based devices.

Electronic energy levels and energy relaxation mechanisms in self-organized InAs/GaAs quantum dots

1996 ◽  
Vol 54 (24) ◽  
pp. 17738-17744 ◽  
Author(s):  
M. J. Steer ◽  
D. J. Mowbray ◽  
W. R. Tribe ◽  
M. S. Skolnick ◽  
M. D. Sturge ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Levels ◽  
Energy Relaxation ◽  
Electronic Energy ◽  
Self Organized ◽  
Electronic Energy Levels

ELECTRON-ENERGY RELAXATION IN POLAR SEMICONDUCTOR DOUBLE QUANTUM DOTS

2001 ◽  
Vol 15 (27) ◽  
pp. 3503-3512 ◽  
Author(s):  
K. KRÁL ◽  
Z. KHÁS ◽  
P. ZDENĚK ◽  
M. ČERŇANSKÝ ◽  
C. Y. LIN
Keyword(s):  
Quantum Dots ◽  
Relaxation Rate ◽  
Phonon Scattering ◽  
Energy Levels ◽  
Realistic Model ◽  
Energy Relaxation ◽  
Electronic Energy ◽  
Double Quantum ◽  
Quantum Bit ◽  
Electronic Energy Levels

The zero-dimensional semiconductor nanostructures belong to the candidates for the realization of the quantum bits. They are expected to be scalable for the purpose of tuning their physical properties. In these structures the quantum bit could be realized in the form of a single quantum dot with two electronic energy levels, with only one electron in the dot. As the basic states of the quantum bit, realized in this way, the two orbital states of the electron in the dot could be used. It appears however that usually the relaxation of the energy of the electron from the excited energy level is often rather fast in the polar semiconductor quantum dots. It is the purpose of this paper to present calculations of the relaxation rate of the electron in an asymmetric pair of tunneling coupled quantum dots, in which the two electronic orbitals of the quantum bit are located each in a separate dot. The calculation of the electronic energy relaxation is based on the multiple electron-LO-phonon scattering processes, implemented to the theory via the electronic self-energy taken in the self-consistent Born approximation. The dependence of the relaxation rate on the geometry of the pair of the coupled dots and on the lattice temperature is presented for a realistic model of this nanostructure.

scholarly journals The ultra-violet spectrum of magnesium hydride. 1.—The band at λ 2430

1929 ◽  
Vol 122 (790) ◽  
pp. 442-455 ◽  
Keyword(s):  
Fine Structure ◽  
General Structure ◽  
Energy Levels ◽  
Visible Region ◽  
Ultra Violet ◽  
Present Theory ◽  
Magnesium Hydride ◽  
Electronic Energy ◽  
Band Spectra ◽  
Electronic Energy Levels

The system of bands in the visible region of the emission spectrum of magnesium hydride is now well known. The bands with heads at λλ 5622, 5211, 4845 were first measured by Prof. A. Fowler, who arranged many of the strongest lines in empirical series for identification with absorption lines in the spectra of sun-spots. Later, Heurlinger rearranged these series in the now familiar form of P, Q and R branches, and considered them, with the OH group, as typical of doublet systems in his classification of the fine structure of bands. More recently, W. W. Watson and P. Rudnick have remeasured these bands, using the second order of a 21-foot concave grating, and have carried out a further investigation of the fine structure in the light of the present theory of band spectra. Their detection of an isotope effect of the right order of magnitude, considered with the general structure of the system, and the experimental work on the production of the spectrum, seems conclusive in assigning these bands to the diatomic molecule MgH. The ultra-violet spectrum of magnesium hydride is not so well known. The band at λ 2430 and the series of double lines in the region λ 2940 to λ 3100, which were recorded by Prof. Fowler in 1909 as accompanying the group of bands in the visible region, appear to have undergone no further investigation. In view of the important part played by hydride band spectra in the correlation of molecular and atomic electronic energy levels, it was thought that a study of these features might prove of interest in yielding further information on the energy states of the MgH molecule. The present paper deals with observations on the band at λ 2430; details of an investigation of the other features of the ultra-violet spectrum will be given in a later communication.

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