Tootfinder

This https://arxiv.org/abs/2505.22183 has been replaced.
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Anomalous Hall Effect in Thick Co$_3$Sn$_2$S$_2$ Weyl Semimetal Crystals
Ferromagnetic Weyl semimetals with Kagome lattice structures exhibit a strong coupling between magnetism and topological band features. Co3Sn2S2 is a prime example, showing a giant anomalous Hall effect (AHE) driven by Berry curvature from the Weyl nodes. We investigated the temperature and angular dependence of Hall conductivity in thick Co3Sn2S2 crystals, aiming to distinguish between topological and conventional magnetic contributions. Our measurements reveal a robust Hall response even at l…

A Parameter Survey of Neutron Star Accretion Column Simulations
Lizhong Zhang, Omer Blaes, Yan-Fei Jiang
https://arxiv.org/abs/2506.02288 https://

A Parameter Survey of Neutron Star Accretion Column Simulations
We conduct a parameter survey of neutron star accretion column simulations by solving the relativistic radiation MHD equations with opacities that account for strong magnetic fields and pair production. We study how column properties depend on accretion rate, magnetic field strength, and accretion flow geometry. All the simulated accretion columns exhibit kHz oscillatory behavior, consistent with our previous findings. We show how the predicted oscillation properties depend on the column parame…

Unveiling Causal Reasoning in Large Language Models: Reality or Mirage?
Haoang Chi, He Li, Wenjing Yang, Feng Liu, Long Lan, Xiaoguang Ren, Tongliang Liu, Bo Han
https://arxiv.org/abs/2506.21215

Unveiling Causal Reasoning in Large Language Models: Reality or Mirage?
Causal reasoning capability is critical in advancing large language models (LLMs) toward strong artificial intelligence. While versatile LLMs appear to have demonstrated capabilities in understanding contextual causality and providing responses that obey the laws of causality, it remains unclear whether they perform genuine causal reasoning akin to humans. However, current evidence indicates the contrary. Specifically, LLMs are only capable of performing shallow (level-1) causal reasoning, prim…

REBCO delamination by transverse electromagnetic stress due to screening current in magnetic field
Jun Lu, Jeremy Levitan, Yu Suetomi, Iain Dixon, Jan Jaroszynski
https://arxiv.org/abs/2507.21301

REBCO delamination by transverse electromagnetic stress due to screening current in magnetic field
REBCO coated conductor has great potential to be used in ultra-high field magnets. Commercial REBCO tapes are strong in the longitudinal direction but prone to delamination by tensile stress in the thickness direction. For high field magnet applications, it is crucial to characterize delamination strength of REBCO conductor and better manage the transverse electromagnetic stress. In this work, the electromagnetic stress in high magnetic fields by screen current is used to study the delamination…

Evaluating and Improving Large Language Models for Competitive Program Generation
Minnan Wei, Ziming Li, Xiang Chen, Menglin Zheng, Ziyan Qu, Cheng Yu, Siyu Chen, Xiaolin Ju
https://arxiv.org/abs/2506.22954

Evaluating and Improving Large Language Models for Competitive Program Generation
Context: Due to the demand for strong algorithmic reasoning, complex logic implementation, and strict adherence to input/output formats and resource constraints, competitive programming generation by large language models (LLMs) is considered the most challenging problem in current LLM-based code generation. However, previous studies often evaluate LLMs using simple prompts and benchmark datasets prone to data leakage. Moreover, prior work has limited consideration of the diversity in algorithm…

Semiconvection unlocks dynamo action in stably-stratified regions of gaseous planets
Paul Pru\v{z}ina, David C\'ebron, Nathana\"el Schaeffer
https://arxiv.org/abs/2506.18521

Semiconvection unlocks dynamo action in stably-stratified regions of gaseous planets
Stably-stratified fluid layers are ubiquitous in gaseous planets, stellar and liquid cores, and have previously been thought not to be capable of driving a dynamo. We demonstrate that semiconvection (convection driven by a destabilising thermal gradient in an overall stably stratified region) can actually lead to dynamo action in such regions. Motivated by recent works suggesting that significant regions of Jupiter and Saturn may be prone to semiconvection, we conduct direct numerical simulatio…