Tootfinder

This is my peet. There are many like it, but this one is mine.

Finance people: If I have a list of mutual fund symbol names and percentages of each, is there an easy API or data source I can use to calculate what my actual underlying equity exposure is?
The specific goal is figuring out how much of my 401k is actually in companies that are propped up by the AI bubble.
I can look at a single ticker symbol and see at least its top n hodlings easily enough but what if I want to know across ten different index funds I own different amounts of, h…

Quantum simulation of nuclear shell model: bridging theory and hardware limitations
Chandan Sarma, Paul Stevenson
https://arxiv.org/abs/2510.02124 https://…

Quantum simulation of nuclear shell model: bridging theory and hardware limitations
In this work, we introduce a new qubit mapping strategy for the Variational Quantum Eigensolver (VQE) applied to nuclear shell model calculations, where each Slater determinant (SD) is mapped to a qubit, rather than assigning qubits to individual single-particle states. While this approach may increase the total number of qubits required in some cases, it enables the construction of simpler quantum circuits that are more compatible with current noisy intermediate-scale quantum (NISQ) devices. W…

Altermagnetism of ultrathin CrSb slabs
Brahim Marfoua, Mohammad Amirabbasi, Marcus Ekholm
https://arxiv.org/abs/2510.00985 https://arxiv.org/pdf/2510.00985…

Altermagnetism of ultrathin CrSb slabs
Altermagnets exhibit momentum-dependent spin splitting without net magnetization, combining characteristics of both ferromagnets and antiferromagnets, making them highly interesting for spintronics applications. CrSb is a prime candidate with a high Néel temperature ($\sim700$~K) and a large exchange-driven splitting of $\sim0.6$--1~eV. Using ab-initio calculations, we consider slabs of various orientations in the ultrathin limit. We find that (100) oriented slabs have spin-degenerate bands. I…

An investor has calculated a poverty line of $137k/y "for a family of four to afford housing, health care, child care and other necessities", which is four times the current line. While I think location matters here, this national figure is still a good reminder of American wealth inequality.
https://wapo.st/44ymv6f

An investor called $140,000 the new poverty line. Experts disagreed but said he had a point.
Michael Green’s tally of the costs of raising a family in the U.S. today is going viral, even if some economists scoff at his math.

I occasionally stop by Reddit for a couple of chuckles. As per usual - the magic is always in the comments
#ShamelesslyStolenFromReddit #shitpost #shitposting

Stacking-Controlled Magnetic Exchange and Magnetoelectric Coupling in Bilayer CrI$_2$
B. Vald\'es-Toro, I. Ferreira-Araya, R. A. Gallardo, J. W. Gonz\'alez
https://arxiv.org/abs/2509.22827

Stacking-Controlled Magnetic Exchange and Magnetoelectric Coupling in Bilayer CrI$_2$
We use a first-principles calculations approach to reveal the electronic and magnetic properties of chromium diiodide (CrI$_2$) bilayers and establish a hierarchy of magnetic interactions across stable registries. The monolayer presents a x-stripe antiferromagnetic ground state, while in bilayers the BA$^\prime$ stacking is the global minimum with antiparallel interlayer magnetic alignment. Bilayer configurations strengthen the exchange in the plane by 6 % to 10 %, while the exchange between la…

Blast from the past!
Writing firmware on my first laptop, for the PIC12F683 (the first microcontroller I ever used), on my first embedded project ever (robotic rubber band gun turret) freshman year of college, bodged together on perf board.
The UART and servo PWM were both bitbanged because the PIC12F683 didn't have any UARTs and I hadn't learned how to use the timer block yet.

Eigenstate Thermalization in 1 1-Dimensional SU(2) Lattice Gauge Theory Coupled with Dynamical Fermions
Diptarka Das, Lukas Ebner, Saurabh V. Kadam, Indrakshi Raychowdhury, Andreas Sch\"afer, Xiaojun Yao
https://arxiv.org/abs/2509.18269

AMaRaNTA: Automated First-Principles Exchange Parameters In 2D Magnets
Federico Orlando (Physics Department - Politecnico di Milano, Milan, Italy, Consiglio Nazionale delle Ricerche CNR-SPIN, c/o Universit\`a degli Studi "G. D'Annunzio", Chieti, Italy), Andrea Droghetti (Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Venice, Italy, Consiglio Nazionale delle Ricerche CNR-SPIN, c/o Universit\`a degli Studi "G. D'Annunzio&quo…

AMaRaNTA: Automated First-Principles Exchange Parameters In 2D Magnets
Two-dimensional (2D) magnets host a wide range of exotic magnetic textures, whose low-energy excitations and finite-temperature properties are typically described by effective spin models based on Heisenberg-like Hamiltonians. A key challenge in this framework is the reliable determination, from ab initio calculations, of exchange parameters and their anisotropic components, crucial for stabilising long-range order. Among the different strategies proposed for this task, the energy-mapping metho…