Confined electrons and holes in Si nanocrystals: Theoretical modeling of the energy spectrum and radiative transitions

2007 ◽  
Vol 27 (5-8) ◽  
pp. 1386-1389 ◽  
Author(s):  
I.N. Yassievich ◽  
A.S. Moskalenko ◽  
A.A. Prokofiev
Keyword(s):  
Energy Spectrum ◽  
Theoretical Modeling ◽  
Radiative Transitions ◽  
Si Nanocrystals

Theoretical modeling of excitation and de-excitation processes of Er in SiO2 with Si nanocrystals

2006 ◽  
Vol 121 (2) ◽  
pp. 222-225 ◽  
Author(s):  
A.A. Prokofiev ◽  
A.S. Moskalenko ◽  
I.N. Yassievich
Keyword(s):  
Theoretical Modeling ◽  
Si Nanocrystals ◽  
Excitation Processes

Mechanisms of Strong Photoluminescence from Si Nanocrystals

2011 ◽  
Vol 222 ◽  
pp. 175-180
Author(s):  
Talivaldis Puritis ◽  
Jevgenijs Kaupuzs ◽  
Edvins Dauksta
Keyword(s):  
Experimental Data ◽  
Radiative Transitions ◽  
Si Nanocrystals

Photoluminescence mechanisms (models) are reviewed and experimental data are analyzed based on our model, related to direct radiative transitions from the second conduction sub-band to the first one.

Defects and Phonon Assisted Optical Transitions in Si Nanocrystals

1998 ◽  
Vol 536 ◽  
Author(s):  
G Allan ◽  
C Delerue ◽  
M Lannoo
Keyword(s):  
Radiative Recombination ◽  
Surface Defect ◽  
Great Sensitivity ◽  
Vibration Modes ◽  
Optical Transitions ◽  
Bulk Silicon ◽  
New Approach ◽  
Radiative Transitions ◽  
Si Nanocrystals ◽  
Full Calculation

AbstractPhonon-assisted and zero-phonon radiative transitions in nanoscale silicon quantum dots are studied using a new approach which combines a full calculation of the confined electronic eigenstates and vibration modes. We predict that the confinement, combined with the indirect bandgap of bulk silicon, must have several important consequences on the luminescence of a single silicon dot: i) a large broadening of the peaks, in the range of 10s of meV for a 3 nm dot, in spite of the atomic-like electronic structure of the dot ii) a great sensitivity of the spectrum to the size and the shape of the dot. We obtain that phonon-assisted transitions always dominate, even for size below 2 nm. Finally, we show that the radiative recombination in presence of an oxygen related surface defect (Si=O) is also assisted by optical phonons.

Recent Radiative and Collisional Atomic Data of Astrophysical Interest

1988 ◽  
Vol 102 ◽  
pp. 129-132
Author(s):  
K.L. Baluja ◽  
K. Butler ◽  
J. Le Bourlot ◽  
C.J. Zeippen
Keyword(s):  
Mass Production ◽  
Bound States ◽  
Physical Models ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Isoelectronic Sequence ◽  
Astrophysical Interest ◽  
Radiative Transitions ◽  
Forbidden Transitions

SummaryUsing sophisticated computer programs and elaborate physical models, accurate radiative and collisional atomic data of astrophysical interest have been or are being calculated. The cases treated include radiative transitions between bound states in the 2p4and 2s2p5configurations of many ions in the oxygen isoelectronic sequence, the photoionisation of the ground state of neutral iron, the electron impact excitation of the fine-structure forbidden transitions within the 3p3ground configuration of CℓIII, Ar IV and K V, and the mass-production of radiative data for ions in the oxygen and fluorine isoelectronic sequences, as part of the international Opacity Project.

The role of ligands in electron transport in nanocrystal solids

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23028-23035
Author(s):  
Artem R. Khabibullin ◽  
Alexander L. Efros ◽  
Steven C. Erwin
Keyword(s):  
Electron Transport ◽  
Theoretical Modeling

Theoretical modeling of wavefunction overlap in nanocrystal solids elucidates the important role played by ligands in electron transport.

Hysteresis in spectral state transitions – a challenge for theoretical modeling

2005 ◽  
Vol 432 (1) ◽  
pp. 181-187 ◽  
Author(s):  
E. Meyer-Hofmeister ◽  
B. F. Liu ◽  
F. Meyer
Keyword(s):  
Theoretical Modeling ◽  
State Transitions ◽  
Spectral State

Epistemological Status of Models and Thought Experiments in Economics

2015 ◽  
pp. 123-140 ◽  
Author(s):  
O. Koshovets ◽  
T. Varkhotov
Keyword(s):  
Natural Science ◽  
Thought Experiment ◽  
Thought Experiments ◽  
Theoretical Modeling ◽  
Epistemological Status ◽  
Epistemological Analysis ◽  
Field Of Inquiry

The paper considers the analogy of theoretical modeling and thought experiment in economics. The authors provide historical and epistemological analysis of thought experiments and their relations to the material experiments in natural science. They conclude that thought experiments as instruments are used both in physics and in economics, but in radically different ways. In the natural science, a thought experiment is tightly connected to the material experimentation, while in economics it is used in isolation. Material experiments serve as a means to demonstrate the reality, while thought experiments cannot be a full-fledged instrument of studying the reality. Rather, they constitute the instrument of structuring the field of inquiry.

Theoretical modeling of the regular olivine intergrowths in the mimetic paramorphosis after ringwoodite and wadsleyite

2018 ◽  
pp. 3-12
Author(s):  
B. B. Shkursky
Keyword(s):  
Transition Zone ◽  
Theoretical Modeling ◽  
Mantle Transition Zone ◽  
Misorientation Angles

Theoretical modeling of regular olivine grains misorientations in mimetic paramorphoses after ringwoodite and wadsleyite, the formation of which during the ascension of matter from the Mantle Transition Zone is expected, has been carried out. The coordinates of the misorientation axes and the misorientation angles, characterizing 10 operations of alignment in the pair intergrowths of olivine grains, eight of which are twins, are calculated. Possible conditions for the formation of mimetic paramorphoses predicted here, and the chances of their persistence are discussed. The calculated orientations are compared with the known twinning laws of olivine.

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