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Band Structure Lab
Computes the electronic structure of various materials in the spatial configuration of bulk (infinitely periodic), quantum wells (confined in one dimension, infinitely periodic in 2 dimensions), and wires (confined in 2 dimensions and infinitely periodic …
Version 2.0.15 - published on 17 May 2011
doi:10254/nanohub-r1308.18 cite this
This tool is closed source.
5.0 out of 5 stars
Anonymous @ 10:46 AM on 11 Feb, 2010
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I experimented with the ‘Band Structure Lab’ in the ‘NCN supported’ category. I’m really impressed with the tool. It is very responsive compared to many other tools that I’ve tried for which you have to submit the simulation request and come back later. The data generated, and especially the plots and 3-D illustrations of the results are very informative and interactive, e.g., the mouse control of the 3-D view and the information of each data-point on the band-structure when mouse hovers over it.There are a couple things that came to my mind when I played with it. First, the source code is not available even to the logged-on members of the site. It would be really great if I could see the code and try to understand how the things were done inside it.
Secondly, I can think of a number of ways in which the visualizaiton of the tool can be further improved. The band-structure diagrams that we look at as of today come from the textbook era when we did not have these interactive tools at our disposal. But now that we have that power there should be a better way to visualize and play with them. For one thing, the plot with energy in the y-axis, Gamma to L-valley on the left of the x-axis and Gamma to X-valley on the right is only a simplified form of the real band structure which is really four dimensional in nature. Even though it is difficult to visualize 4-D, we can atleast create a 3-D approximation instead of the plain old 2-D approximation. So any given plot in 3-D would have energy on it’s z-axis and k_x and k_y on it’s x and y axes.
We can actually get away with energy axes altogether by assigning k_z to z-axis. But for that we’ll have to represent energy level with something like a ‘density of fog’. So that the low energy areas of the 3-D space have no fog and high-energy areas have a very thick fog. But I guess this kind of visualization should be used in conjunction with the 3-D approximation instead of replacing it.
Another thing that comes to mind is the visual feedback while configuring the tool before even starting the simulation. For example, there is an illustration of a crystal lattice on the first page of the ‘Band Structure Lab’ tool (the page on which you can select the material to simulate, Si, Ge, etc). When a different material is selected there should be a change in the lattice to represent the new material. Likewise when there is a setting to adjust the length and width of some device and there is an illustration of the device on that settings page, the illustration should be updated to reflect the new length and width.
Finally, I would emphasize that ‘Band Structure Lab’ is a really great way of exploring the band-structures of different materials and I would want spend more and more time with during the course of my research work.
Fawad Hassan (UIUC)
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5.0 out of 5 stars
Fawad Hassan @ 01:23 PM on 11 May, 2009
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Hi I explored the tool as part of the Spring 2009 ECE 539 coursework at University of Illinois Urbana-Champaing, under Professor Umberto Ravaioli. I have put my comments on the class page wiki at the following URL:https://nanohub.org/groups/illinois_ece_539_advanced_theory_of_semiconductors_and_devices/ wiki/ExploringBandStructureLabbyFawadHassan
In short, I’m really impressed with the tool and would want to use it further in my research work. I also suggested some further ways to visualize the results that can possibly augment the understanding of the physics involved.
Thanks, Fawad Hassan
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Gerhard Klimeck @ 12:09 AM on 04 Jun, 2009
Thank you very much for your kind comments.Since you are suggesting tool improvements in the wiki page, I would suggest that you transfer those ideas over into the new tool wish-lists. This way the bandstructure lab development team can evaluate them, prioritize them against other suggestions and possibly move forward with some of the implementations.
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5.0 out of 5 stars
Neelanjan Bhattacharya @ 08:29 PM on 15 Dec, 2008
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I always wondered how single crystal of a quantum wire looked like. This tool gives the unit cell and full wire structure as per the orientation.All properties depend on crystal orientation and therefore i found this tool simply excellent. I will be comparing the theoretical simulation here with my experimental data very soon. Thanks for your very good tool.
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5.0 out of 5 stars
Anonymous @ 08:03 AM on 26 Nov, 2006
No comment.
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5.0 out of 5 stars
Ali Khakifirooz @ 04:37 PM on 14 Aug, 2006
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5.0 out of 5 stars
Jing Wang @ 05:23 PM on 26 May, 2006
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