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ABACUS—Introduction to Semiconductor Devices
Introduction When we hear the words, semiconductor device, we may think first of the transistors in PCs or video game consoles, but transistors are the basic component in all of the electronic …
Benjamin P Haley
Ben received his B.S. in Physics from Purdue in 1998. He worked for Cummins Engine Co and Intel before attending graduate school at UC Davis. He received a Masters in Engineering Applied Science in …
compare a tight binding calculation to the analytical expansion methodin this tool
Open | Responses: 2
The tool solves the analytical expansions through transfer matrices to compute transmission coefficients. The RTD tool for example solves the similar problem in a single effective mass approach. It …
Effective mass variation in pcpbt is not working correctly for tight binding
For a double barrier structure doubling the barrier height or doubling the effective mass should roughly have the same effect (for low lying energy states, say when the barrier is already high and …
Feedback about the progress in the resonance finding would be great -
Open | Responses: 1
If the resonance refinement happens in various stages it would be good to report these stages as a progress meter in the calculation
for 100 barriers the resonance finder has some problems
It appears that the resonance finder works quite well, but I have a feeling that the resonances themselves are not counted properly. For example at 100 barriers one can see that the second band …
How is the k (horizontal location for green dots) calculated?
Closed | Responses: 0
I looked through the MATLAB code at https://nanohub.org/resources/9203 and it does not produce anything like the green dots plot. How is the k (which I take as the Bloch parameter) computed from the …
Is it working for triangular barrier?
I tried to use 5 barriers simulations to simulate a single triangular barrier transmission. I set different barrier height for each barrier, and set the inter-barrier region witdh to be 0. Why did I …
Piece-Wise Constant Potential Barriers Tool: First-Time User Guide
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01 Jun 2009 | Teaching Materials | Contributor(s): Samarth Agarwal, Gerhard Klimeck
This supporting document for the Piece-Wise Constant Potential Barriers Tool serves as a first-time user guide. Some basic ideas about quantum mechanical tunneling are introduced in addition to how …
Samarth Agarwal got a PhD. in Physics from Purdue University in 2010. His work involved band-gap engineering for solar cells and exploring novel devices for reduction in power consumption of …
single barrier choice results in no output
I thought this had gotten fixed in the code, but again the tool does not create any outputs when a single barrier is chosen
the lattice constant for tight binding should be really used in the generation of the heterostructure
Right now the lattice constant is set to the GaAs lattice constant of 0.56. That means that the barriers should be automatically set to equal multiples of that lattice constant - one cannot have a …
the tight binding calculations do not yet allow for a change in effective masses
Open | Responses: 3
It would be great if the tool would also allow for changing effective masses along the device. Barrier materials have typically different effective masses from well materials. It would also be …
the tool does not create transmission coefficients for a single barrier case
neither the band-edge diagram nor the transmission coefficient are shown. It seems like this tool should be able to handle a single barrier. Maybe there is a simple coding problem
transmission and reflection coefficients on exchanged axes
It would be convenient for educational purposes if the transmisison and reflection coefficients could also be plotted on interchanged axes where enegy is on the vertical axis , just like the band …
what does the tool improvement of version 1.1.9 really mean?
1.1.9 - A problem pertaining to the geometry adjustment when a tight-binding calculation is called, has been corrected. i think a bit more description is really needed. Is the barrier …
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