When spice simulation isn't deep enough... Very educational to show how circuit elements work "under the hood"...for example the LC example doesn't use an L element and a C element as building blocks, but rather it is the two metal plates in close contact which form the bulk of the circuit's capacitance and it is the loop of metal itself which form the inductance.
On my info page (https://brandonli.net/semisim/info) there's a list of things my simulation can and can't do. After taking a look at the paper you mentioned, I think simulating it may very well be possible, however it might take a bit of effort. As for graphene, its band structure is different enough that I don't think it would work.
Note that my simulation is intended for educational purposes only, not scientific research.
When spice simulation isn't deep enough... Very educational to show how circuit elements work "under the hood"...for example the LC example doesn't use an L element and a C element as building blocks, but rather it is the two metal plates in close contact which form the bulk of the circuit's capacitance and it is the loop of metal itself which form the inductance.
I wonder how they simulate EM in only 2 dimensions.
I also wonder why the simulator only allows to show E and D fields, and not H and B.
Fun. I am reminded of the long forgotten Zachtronics semiconductor game “KOHCTPYKTOP: Engineer of the People” [1]
[1] https://www.zachtronics.com/kohctpyktop-engineer-of-the-peop...
Did you know that archive supports old Flash games like this via the Ruffle Flash emulator?
https://web.archive.org/web/20160305205215/http://www.zachtr...
This is also available (with an included Flash emulator, so playable on modern machines) in Zach's free retrospective "Zach-like" [1]
[1] https://store.steampowered.com/app/1098840/ZACHLIKE/
ChipWizard is the updated version and it's in Last Call BBS (from Zachtronics).
Sebastian Lague has been making one of these and youtubing it, the videos are great here's the latest one https://www.youtube.com/watch?v=HGkuRp5HfH8
Note that these are at very different levels of detail. Lague's is at the digital logic level, while Brandon's is some level around atoms/electrons.
Amazing work feels very similar to Paul Falstad page https://www.falstad.com/emstatic/index.html.
This really needs a WebGPU port. Multigrid on a GPU is moderately easy.
The similarity is likely not a coincidence!
> (c) Brandon Li, 2025. Ported to Javascript with the help of Paul Falstad.
Which other simulators show electron charge density and heat dissipation?
Can this simulate this?:
"Synaptic and neural behaviours in a standard silicon transistor" (2025) https://www.nature.com/articles/s41586-025-08742-4 .. https://news.ycombinator.com/item?id=43506198
What about (graphene) superconductors though?
On my info page (https://brandonli.net/semisim/info) there's a list of things my simulation can and can't do. After taking a look at the paper you mentioned, I think simulating it may very well be possible, however it might take a bit of effort. As for graphene, its band structure is different enough that I don't think it would work.
Note that my simulation is intended for educational purposes only, not scientific research.
- Brandon
The UI is rough but this is very impressive!
This looks exciting, but the images make it look like maybe it's two-dimensional?
So how accurate are the results?
im super into stuff like this, takes me back to messing with circuit sims for hours
Very clean, educational and informative. Well done, from one Brandon to another!
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Really sexy