scholarly journals Coupled-Channels Density-Matrix Approach to Low-Energy Nuclear Reaction Dynamics

2011 ◽  
Author(s):  
Alexis Diaz-Torres ◽  
Paraskevi Demetriou ◽  
Rauno Julin ◽  
Sotirios Harissopulos
Keyword(s):  
Density Matrix ◽  
Nuclear Reaction ◽  
Reaction Dynamics ◽  
Low Energy ◽  
Matrix Approach ◽  
Coupled Channels

Few-Particle Effects in Nonlinear Optical Spectra of Semiconductor Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
Ulrich Hohenesteri ◽  
Fausto Rossi ◽  
Elisa Molinari
Keyword(s):  
Quantum Dots ◽  
Density Matrix ◽  
Nonlinear Optical ◽  
Coherent Control ◽  
Optical Spectra ◽  
Carrier Dynamics ◽  
Semiconductor Quantum Dots ◽  
Nonequilibrium Carrier ◽  
Optical Nonlinearities ◽  
Matrix Approach

ABSTRACTWe present a density-matrix approach for the description of nonequilibrium carrier dynamics in optically excited semiconductor quantum dots, that explicitly accounts for exciton-exciton as well as exciton-carrier interactions. Within this framework, we analyze few-particle effects in the optical spectra and provide a consistent description of additional peaks appearing at high photoexcitation density. We discuss possible applications of such optical nonlinearities in future coherent-control experiments.

Low-energy nuclear reaction of the N14+Tm169 system: Incomplete fusion

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
R. Kumar ◽  
Vijay R. Sharma ◽  
Abhishek Yadav ◽  
Pushpendra P. Singh ◽  
Avinash Agarwal ◽  
...  
Keyword(s):  
Nuclear Reaction ◽  
Low Energy ◽  
Incomplete Fusion

Optical properties of Quantum Disks: Real density matrix approach

Open Physics ◽  
2006 ◽  
Vol 4 (2) ◽  
Author(s):  
Gerard Czajkowski ◽  
Leonardo Silvestri
Keyword(s):  
Density Matrix ◽  
Guided Wave ◽  
Matrix Approach ◽  
Electron Hole ◽  
Optical Functions ◽  
Quantum Disk ◽  
All Optical ◽  
Quantum Disks ◽  
Analytical Expressions ◽  
Real Density

AbstractWe show how to compute the optical response of a Quantum Disk (QDisk) to an electromagnetic wave as a function of the incident wave polarization, in the energetic region of interband transitions. Both the TM and TE polarization in guided-wave geometry are analyzed. The method uses the microscopic calculation of Quantum Disk eigenfunctions and the macroscopic real density matrix approach to compute the effective QDisk susceptibility, taking into account the valence band structure of the QDisk material and the Coulomb interaction between the electron and the hole. Analytical expressions for the QDisk susceptibility are obtained for a certain model electron — hole potential. Using these expressions, all optical functions can be computed. Results for the absorption coefficient are computed for InAs/GaAs QDisks. Fair agreement with experiments is obtained.

LINEAR AND NONLINEAR INTERSUBBAND REFRACTIVE INDEX CHANGES IN WURTZITEAlGaN/GaNDOUBLE QUANTUM WELLS: EFFECTS OF PIEZOELECTRICITY AND SPONTANEOUS POLARIZATION

2009 ◽  
Vol 16 (01) ◽  
pp. 11-17
Author(s):  
L. ZHANG
Keyword(s):  
Refractive Index ◽  
Density Matrix ◽  
Quantum Wells ◽  
Structural Parameters ◽  
Matrix Approach ◽  
Third Order ◽  
Numerical Result ◽  
Analytical Formulas ◽  
Index Changes ◽  
Linear And Nonlinear

Based on the density-matrix approach and iterative treatment, a detailed procedure for the calculation of the linear and nonlinear intersubband refractive index changes (RICs) in wurtzite GaN-based coupling quantum wells (CQWs) is given. The simple analytical formulas for electronic eigenstates and the linear and third-order nonlinear RICs in the systems are also deduced. Numerical result on a typical AlGaN / GaN CQW shows that the linear and nonlinear RICs sensitively depend on the structural parameters of the CQW system as well as the doped fraction of nitride semicondutor.

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