Particle generation and recombination

2020 ◽  
pp. 417-453
Author(s):  
Sandip Tiwari
Keyword(s):  
Impact Ionization ◽  
Radiative Lifetime ◽  
Momentum Conservation ◽  
Recombination Coefficient ◽  
Auger Process ◽  
Particle Generation ◽  
Radiative Processes ◽  
High Concentrations ◽  
Energy And Momentum ◽  
Energetic Interactions

This chapter introduces a semi-classical interpretation of particle generation and recombination using the bimolecular recombination coefficient and radiative lifetime. Particles—electrons and holes in the semiconductor—can be generated and recombine because of the multitude of energetic interactions. Radiative recombination and generation arise in the interaction with photons and can be spontaneous or stimulated. Important non-radiative processes such as the Hall-Shockley-Read process and the Auger process, which arise in multiparticle interactions, are discussed. Auger recombination is common at small bandgaps and high concentrations but also appears in large bandgap materials under high injection conditions. Impact ionization is an example of Auger generation arising from high fields. The Auger process is analyzed quantum-mechanically to show how energy and momentum conservation equations and quantum restrictions lead to the observed behavior. The chapter also discusses recombination at surfaces, which is inevitably present because of the defects and confined states arising from symmetry breaking.

Impact Ionization and Auger Recombination in Semiconductors: Implementation Within the Flapw Code

2001 ◽  
Vol 677 ◽  
Author(s):  
S. Picozzi ◽  
A. Continenza ◽  
R. Asahi ◽  
W. Mannstadt ◽  
C. B. Geller ◽  
...  
Keyword(s):  
Brillouin Zone ◽  
Density Functional ◽  
Auger Recombination ◽  
Impact Ionization ◽  
Momentum Conservation ◽  
Recombination Rates ◽  
Screened Exchange ◽  
Energy And Momentum ◽  
Final Impact ◽  
Ionization Rates

ABSTRACTWe present a method to calculate impact ionization and Auger recombination rates within density functional theory and a screened-exchange approach and implement it in the all- electron FLAPW method. We investigate the dependence of the overlap matrix elements as a function of the states involved along the main symmetry lines of the Brillouin zone. Our results for the final impact ionization rates along the main symmetry lines of the Brillouin zone. Our results for the final impact ionization rates along τ — X and τ —L directions for GaAs show a strong anisotropy imposed by energy and momentum conservation and related to the use of a realistic and accurate sX-LDA band structure.

scholarly journals The Impact of Teaching Physics via Modeling on Modifying Alternative Conception of Energy and Momentum Conservation among 11th Grade Female Students

2017 ◽  
Vol 11 (1) ◽  
pp. 53
Author(s):  
Abdulah K. Ambusaidi ◽  
Rahma M. Al Sabri
Keyword(s):  
Science Teachers ◽  
Momentum Conservation ◽  
Female Students ◽  
Scientific Models ◽  
Significant Difference ◽  
Energy And Momentum ◽  
The Impact ◽  
Teaching Physics ◽  
Experimental Group ◽  
11Th Grade

This study investigated the impact of teaching physics via modeling on theacquisition of energy and momentum conservation concepts. The sample consisted of 91 female students selected from 11th grade female students in two schools in Al-Dakhiliyah Governorate in Oman. The experimental group (n = 45) was taught via the modeling method, and the control group (n = 46) was taught using a traditional method. The study lasted six weeks during the second semester of the academic year 2013/2014. A teacher guide for teaching by models was designed and validated by a group of experts. To measure the acquisition of physics concepts, energy and momentum, an achievement test was used. The test consisted of 20 multiple-choice questions. Its reliability was measured by test-retest method (r = 0.79). The results revealed a statistically significant difference (p < .05) between the means of the experimental and control groups in favor of the experimental group. The study recommends that science teachers ought to use models and modeling in their teaching. Workshops to train supervisors, in-service teachers and pre-service teachers in the construction and development of scientific models need to be conducted

scholarly journals New results on energy and momentum conservation for particle emission in A+A collisions at not too high energies

2017 ◽  
Author(s):  
Andrzej Rybicki ◽  
Miroslaw Kielbowicz ◽  
Antoni Szczurek ◽  
Iwona Anna Sputowska
Keyword(s):  
Momentum Conservation ◽  
Particle Emission ◽  
High Energies ◽  
Energy And Momentum

scholarly journals Numerical investigations of stainless steel melt motions on the surface of uranium dioxide

2019 ◽  
Vol 196 ◽  
pp. 00005 ◽  
Author(s):  
Eduard V. Usov ◽  
Pavel D. Lobanov ◽  
Ilya A. Klimonov ◽  
Alexander E. Kutlimetov ◽  
Anton A. Butov ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Uranium Dioxide ◽  
Momentum Conservation ◽  
Mass Energy ◽  
Numerical Investigations ◽  
Fuel Rod ◽  
The Core ◽  
Fuel Pin ◽  
Energy And Momentum ◽  
Coolant Velocity

The paper contains the results of numerical simulation of stainless steel melt motions on the surface of uranium dioxide. The investigations are performed for purposes of understanding of the fuel rod behavior during the core disruptive accident in the fast reactors. The systems of mass, energy and momentum conservation equations are solved to simulate melt motion on the surface of the fuel pin. Heat transfer and friction between melt and pin's surface and melt and coolant flow are taken into consideration. The dependences of mass of the melt and the features of the melt motion on coolant velocity and contact angle between melt and surface of the fuel rod are presented.

An Action-at-a-Distance Theory of Gravitation

1971 ◽  
Vol 49 (2) ◽  
pp. 201-217 ◽  
Author(s):  
A. B. Volkov
Keyword(s):  
Momentum Conservation ◽  
Dielectric Dispersion ◽  
Interaction Theory ◽  
Theory Of Relativity ◽  
General Theory Of Relativity ◽  
Vector Interaction ◽  
Perihelion Advance ◽  
Theory Of Gravitation ◽  
Action At A Distance ◽  
Energy And Momentum

An action-at-a-distance theory is formulated as a possible alternative to the general theory of relativity. The observed gravitational frequency shift and light bending are obtained by photon energy and momentum conservation effects and gravitational–electromagnetic phenomena are interpreted in analogy with the quantum theory of dielectric dispersion. The observed perihelion advance of Mercury is obtained by a combined scalar and vector interaction theory of the Wheeler–Feynman type. The vector interaction is no longer excluded by conventional field theoretic arguments.

Sign in / Sign up

Export Citation Format

Share Document