Jan Hermann
jan.hermann.name
Jan Hermann
@jan.hermann.name
Computational chemistry & physics, electrons, deep learning 🚲☕️♟️ Microsoft Research AI for Science · https://jan.hermann.name
Was it painful?
July 4, 2025 at 2:04 PM
The OALD for example says a lie is “a statement made by somebody knowing that it is not true”. Ie it implies intent. I don’t think an LLM knows that it says an untruth. So it cannot lie
July 2, 2025 at 4:24 PM
I mean, when Kepler figured out the laws of planetary motion, he also used old Babylonian astronomical data
June 27, 2025 at 6:19 PM
Feynman Lectures!
June 27, 2025 at 4:42 PM
Future versions of our Skala functional, bsky.app/profile/jan...., will be trained on increasingly diverse yet steadfastly accurate data, and for multireference systems we'll need every possible tool from the quantum chemistry toolbox, and then some more. With Orbformer, we're making our own tools
🚀 After two+ years of intense research, we’re thrilled to introduce Skala — a scalable deep learning density functional that hits chemical accuracy on atomization energies and matches hybrid-level accuracy on main group chemistry — all at the cost of semi-local DFT ⚛️🔥🧪🧬
June 26, 2025 at 9:15 AM
Orbformer does this for the first time at scale, having been pretrained on 22k equilibrium and dissociating structures. The resulting model rivals the cost–accuracy ratio of traditional multireference methods and can be systematically converged to chemical accuracy
June 26, 2025 at 9:15 AM
Traditional ab initio methods run always from scratch—no taking advantage of shared electronic structure patterns between molecules. Deep QMC changes this by first pretraining a large wavefunction model that is then cheaply fine-tuned—amortizing the pretraining cost
June 26, 2025 at 9:15 AM
Why care? Strong correlation appears whenever bonds snap, radicals roam, or near-degeneracy sets in—combustion, catalysis, photochemistry. Take nitrogenase, an enzyme that can break N₂ and whose active site is a poster child for strong correlation. With Orbformer we focused on bond breaking
June 26, 2025 at 9:15 AM
Cool work! Is the distillation protocol cheap enough that you could use it with DFT directly as the teacher, skipping the foundation FF entirely?
June 23, 2025 at 5:21 PM
We’ll definitely release Skala as part of some DFT library! Exact plans being finalized. We’ll get in touch when we’re ready to share details. We’d love Skala to be available in ORCA
June 18, 2025 at 5:41 PM
..., @lab-initio.bsky.social, Deniz Gunceler, @megstanley.bsky.social, @wessel.ai, Lin Huang, Xinran Wei, Jose Garrido Torres, Abylay Katbashev, @balintmate.bsky.social, @oumarkaba.bsky.social, Roberto Sordillo, Yingrong Chen, @dbwy-science.bsky.social, Christopher Bishop, Kenji Takeda, ...
June 18, 2025 at 11:24 AM
This is a highly collaborative team effort across deep learning, quantum chemistry & physics
⚡🧪 #DFT #ChemTwitter #CompChem #AI4Science

👥 The dream team: @chinweih.bsky.social, @giulia-lu.bsky.social, @derkkooi.bsky.social, Thijs Vogels, Sebastian Ehlert, Stephanie Lanius, Klaas Giesbertz, ...
June 18, 2025 at 11:24 AM
To test Skala’s practical utility, we show it reliably predicts equilibrium geometries and dipole moments. Though only minimal constraints are built into its neural network design, more exact physical constraints emerge naturally as training data grows!
June 18, 2025 at 11:24 AM
Which data? Trained on ~150k high-accuracy reaction energies, incl. 80k atomization energies, Skala hits an unprecedented 1.06 kcal/mol on atomization energies on W4-17. On GMTKN55 it reaches 3.89 WTMAD-2, matching SOTA hybrid functionals at the cost of semi-local DFT
June 18, 2025 at 11:24 AM
What makes Skala different? Skala is a deep-learning based XC functional that bypasses expensive hand-designed nonlocal features typically used to achieve higher accuracy, by learning nonlocal representations directly from an unprecedented amount of high-accuracy data
June 18, 2025 at 11:24 AM
How is DFT done today? Existing XC functionals rely on hand-crafted features from Jacob’s ladder 🪜 that trade accuracy for efficiency. Yet none achieve the chemical accuracy and generality needed for reliable predictions of the outcome of laboratory experiments
June 18, 2025 at 11:24 AM
Enter Density Functional Theory (DFT), the backbone 𖠣 of computational chemistry. Although DFT can, in principle, calculate the electronic energy exactly, practical applications rely on approximations to the unknown 🔍 exchange-correlation (XC) energy functional
June 18, 2025 at 11:24 AM