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Moving TowardNano-TCAD ThroughMultimillion-AtomQuantum-DotSimulations MatchingExperimental Data Muhammad UsmanHoon RyuInsoo Woo2009 год

Moving Toward Nano-TCAD Through Multimillion-Atom Quantum-Dot Simulations Matching Experimental Data
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Аннотация: Low-loss optical communication requires light sources at 1.5um wavelengths. Experiments showed without much theoretical guidance that InAs/GaAs quantum dots (QDs) may be tuned to such wavelengths by adjusting the In fraction in an InxGa1-xAs strain-reducing capping layer (SRCL). In this work systematic multimillion atom electronic structure calculations qualitatively and quantitatively explain for the first time available experimental data. The NEMO 3-D simulations treat strain in a 15 million atom system and electronic structure in a subset of ~9 million atoms using the experimentally given nominal geometries and without any further parameter adjustments the simulations match the nonlinear behavior of experimental data very closely. With the match to experimental data and the availability of internal model quantities significant insight can be gained through mapping to reduced order models and their relative importance. We can also demonstrate that starting from simple models has in the past led to the wrong conclusions. The critical new insight presented here is that the QD changes its shape. The quantitative simulation agreement with experiment without any material or geometry parameter adjustment in a general atomistic tool leads us to believe that the era of nano Technology Computer Aided Design (nano-TCAD) is approaching. NEMO 3-D will be released on nanoHUB.org where the community can duplicate and expand on the results presented here through interactive simulations.
Год издания: 2009
Авторы: Muhammad Usman, Hoon Ryu, Insoo Woo, David S. Ebert, Gerhard Klimeck
Издательство: Institute of Electrical and Electronics Engineers
Источник: IEEE Transactions on Nanotechnology
Ключевые слова: Semiconductor Quantum Structures and Devices, Semiconductor Lasers and Optical Devices, Quantum and electron transport phenomena
Другие ссылки: IEEE Transactions on Nanotechnology (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
DataCite API (HTML)