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FOTON-OHM UMR CNRS 6082            

 

 

Simulations

The research team has a large experience in the calculation of the electronic states in semiconductor nanostructures : quantum wells or quantum dots. Different kind of calculations have been developed recently : 1-band, 8-band or 30-band k.p calculations with different approximations. A large attention is paid to the development of analytical models used as far as possible. Atomic Calculations (ab initio, tight-binding,...) are also developed which are time consuming but very powerful for some applications (bandlineups in superlattice).

A summary of few results obtained in european network of excellence can be found here :

Simulation activities within Sandie (2007)

A more recent summary is given here :

Simulation activities (2012)

 

Assumed nanaostructure shape from experiment

Preliminary calculations (both analytical and numerical) on nanostructures (strain, piezoelectric field):

k.p calculations performed on nanostructures, electrons and holes states calculation in a single quantum dot :

Atomistic calculations (ab initio): band linups in InAs/Si superlattice :

The research team aims 3 calculations stations, in order to develop complex and parallelised computations :

***1 station Tyan VX50 S4985 : 8 processeurs opteron 8354 2.2GHz à 4 coeurs (32 cpu), 16GO de mémoire (ext. à 128GO), disque dur 2x500GO
système : linux Suse 10.1 KDE 3.5.1, logiciels : abinit 5.4.4, siesta 2.0.1, Xcrysden

***1 station Tyan VX50 S4881 : 8 processeurs opteron 8212 2GHz à 2 coeurs (16cpu), 16GO de mémoire (ext. à 128GO), disque dur  500GO
système : linux Suse 10.1 KDE 3.5.1, logiciels : abinit 5.4.4, siesta 2.0.1, Xcrysden

***1 station Tyan VX50 S2892 : 2 processeurs opteron 275 2.2GHz à 2 coeurs (4cpu), 16GO de mémoire, disque dur 200GO
système : linux Suse 10.1 KDE 3.5.1, logiciels : abinit 5.4.4, siesta 2.0.1, Xcrysden
système : Windows xP64 bits professionnel : logiciels : COMSOL3.4, matlab 7

Simulations are confronted to the experiments (PL, TRPL, absorption, spectroscopy ...). It allows to understand physical phenomena, but are also a very useful for the design and optimisation of nanostructure-based devices, grown at the lab.


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