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Results fail to appear with certain parameters
The Quantum Dot Lab tool failed to give me any result when I used the default inputs with following parameters:
Number of States: 50
Geometry: Pyramid
Simulation seemed to run, but no result was displayed. Decreasing the number of states seem to solve this problem.
Thanks,
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Asked by Anonymous - 6 months ago - 2 responses
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Answers (2)
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Posted on 19 June, 2008 by Gerhard Klimeck
0 0 Login to vote The absorption lines were consisting of too many datapoints to be properly processed. Xufeng Wang implemented a stop gap to capture the corner case of too many points and filters out points. NEMO3D still can get modified to not dump out as many points.
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Posted on 20 June, 2008 by Gerhard Klimeck
0 0 Login to vote The quantum dot lab was updated further such that the optical absorption lines are not as finely resolved and therefore do not demand such large file sizes.
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The default absorption line width was also increased by a factor of 10.
Finally the number of allowed states was increased to 150.
I just submitted the changes into the system. This new version should be deployed within a day or so.
This fix seems to work just fine for now.
The real problem here is that as the number of potentially possible transitions increases with the square of the number of involved states. Not all of these transitions are however optically active and may not need to be resolved. However, tight now the inhomogeneous energy grid just goes ahead and tries to resolve any possible transition irrespective of its strength. That means if the number of states is becoming large, that the absorption files are getting large with a very large number of energy points. the data might have over 200,000 points in it.
This leaves room for future improvements..... :-)