7 ms·

On my info page (https://brandonli.net/semisim/info https://brandonli.net/semisim/info) there's a list of things my simulation can and can't do. After taking a

On my info page (https://brandonli.net/semisim/info 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

westurner 1y ago
Thanks, quite the useful simulator; I hadn't found that page yet. Additional considerations for circuit simulators: What does the simulator say about signal delay and/or propagation in electronic circuits and their fields? How long does it take for a lightbulb to turn on after a switch is thrown, given the length of the circuit and the real distance between points in it? (I learned this gap in our understanding of electron behavior from this experiment, which had never been done FWIU: "How Electricity Actually Works" (2022) https://www.youtube.com/watch?v=oI_X2cMHNe0 https://www.youtube.com/watch?v=oI_X2cMHNe0 ) FWIW, additionally: Hall Effect and Quantum Anomalous Hall Effect; "Tunable superconductivity and Hall effect in a transition metal dichalcogenide" (2025) https://news.ycombinator.com/item?id=43347319 https://news.ycombinator.com/item?id=43347319 ScholarlyArticle: "Moiré-driven topological electronic crystals in twisted graphene" (2025) https://www.nature.com/articles/s41586-024-08239-6 https://www.nature.com/articles/s41586-024-08239-6 NewsArticle: "Anomalous Hall crystal made from twisted graphene" (2025) https://physicsworld.com/a/anomalous-hall-crystal-made-from-twisted-graphene/ https://physicsworld.com/a/anomalous-hall-crystal-made-from-... From "Single-chip photonic deep neural network with forward-only training" https://news.ycombinator.com/item?id=42314581 https://news.ycombinator.com/item?id=42314581 : "Fractional quantum anomalous Hall effect in multilayer graphene" (2024) https://www.nature.com/articles/s41586-023-07010-7 https://www.nature.com/articles/s41586-023-07010-7 "Coherent interaction of a-few-electron quantum dot with a terahertz optical resonator" (2023) https://arxiv.org/abs/2204.10522 https://arxiv.org/abs/2204.10522 .. https://news.ycombinator.com/item?id=39365579 https://news.ycombinator.com/item?id=39365579 > "Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework" (2024) https://www.science.org/doi/10.1126/sciadv.adi3147 https://www.science.org/doi/10.1126/sciadv.adi3147 Electrons (and photons and phonons and other fields of particles) are more complex than that though.
- stunningllama 1y ago
  I recreated Veritasium's setup in my simulator and measured the current through the load resistor, the results of which are here: https://imgur.com/a/sxVihf0 https://imgur.com/a/sxVihf0 The gap between the wires is about 1 micrometer, so light should take about 3 fs to propagate through. The simulation output approximately matches this prediction, and over the first few tens of femtoseconds the current increases, with a jump at around 70 fs due to the reflected wave. All of this is pretty much in line with the results of Veritasium's experiment. Thanks for bringing it up. I might include this as another example in my sim.
  - westurner 1y ago
    Nice. These are cool _ wave propagation vids too; Nils Berglund wave visualizations: https://youtu.be/v0cZjOIfwos?si=07w2Wd4dPlGmNxHp https://youtu.be/v0cZjOIfwos?si=07w2Wd4dPlGmNxHp _: photon, fluid, standing transverse,, plasma What about longitudinal waves in plasma, superconductors, and superfluids though? https://www.google.com/search?q=What+about+longitudinal+waves+in+plasma%2C+superconductors%2C+and+superfluids+though https://www.google.com/search?q=What+about+longitudinal+wave... I suppose vorticity doesn't matter that much for classical electronic circuits

westurner 1y ago

Thanks, quite the useful simulator; I hadn't found that page yet. Additional considerations for circuit simulators: What does the simulator say about signal delay and/or propagation in electronic circuits and their fields? How long does it take for a lightbulb to turn on after a switch is thrown, given the length of the circuit and the real distance between points in it? (I learned this gap in our understanding of electron behavior from this experiment, which had never been done FWIU: "How Electricity Actually Works" (2022) https://www.youtube.com/watch?v=oI_X2cMHNe0 https://www.youtube.com/watch?v=oI_X2cMHNe0 ) FWIW, additionally: Hall Effect and Quantum Anomalous Hall Effect; "Tunable superconductivity and Hall effect in a transition metal dichalcogenide" (2025) https://news.ycombinator.com/item?id=43347319 https://news.ycombinator.com/item?id=43347319 ScholarlyArticle: "Moiré-driven topological electronic crystals in twisted graphene" (2025) https://www.nature.com/articles/s41586-024-08239-6 https://www.nature.com/articles/s41586-024-08239-6 NewsArticle: "Anomalous Hall crystal made from twisted graphene" (2025) https://physicsworld.com/a/anomalous-hall-crystal-made-from-twisted-graphene/ https://physicsworld.com/a/anomalous-hall-crystal-made-from-... From "Single-chip photonic deep neural network with forward-only training" https://news.ycombinator.com/item?id=42314581 https://news.ycombinator.com/item?id=42314581 : "Fractional quantum anomalous Hall effect in multilayer graphene" (2024) https://www.nature.com/articles/s41586-023-07010-7 https://www.nature.com/articles/s41586-023-07010-7 "Coherent interaction of a-few-electron quantum dot with a terahertz optical resonator" (2023) https://arxiv.org/abs/2204.10522 https://arxiv.org/abs/2204.10522 .. https://news.ycombinator.com/item?id=39365579 https://news.ycombinator.com/item?id=39365579 > "Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework" (2024) https://www.science.org/doi/10.1126/sciadv.adi3147 https://www.science.org/doi/10.1126/sciadv.adi3147 Electrons (and photons and phonons and other fields of particles) are more complex than that though.

stunningllama 1y ago
I recreated Veritasium's setup in my simulator and measured the current through the load resistor, the results of which are here: https://imgur.com/a/sxVihf0 https://imgur.com/a/sxVihf0 The gap between the wires is about 1 micrometer, so light should take about 3 fs to propagate through. The simulation output approximately matches this prediction, and over the first few tens of femtoseconds the current increases, with a jump at around 70 fs due to the reflected wave. All of this is pretty much in line with the results of Veritasium's experiment. Thanks for bringing it up. I might include this as another example in my sim.
- westurner 1y ago
  Nice. These are cool _ wave propagation vids too; Nils Berglund wave visualizations: https://youtu.be/v0cZjOIfwos?si=07w2Wd4dPlGmNxHp https://youtu.be/v0cZjOIfwos?si=07w2Wd4dPlGmNxHp _: photon, fluid, standing transverse,, plasma What about longitudinal waves in plasma, superconductors, and superfluids though? https://www.google.com/search?q=What+about+longitudinal+waves+in+plasma%2C+superconductors%2C+and+superfluids+though https://www.google.com/search?q=What+about+longitudinal+wave... I suppose vorticity doesn't matter that much for classical electronic circuits