Tootfinder

Non-Asymptotic Analysis of Online Local Private Learning with SGD
Enze Shi, Jinhan Xie, Bei Jiang, Linglong Kong, Xuming He
https://arxiv.org/abs/2507.07041

Non-Asymptotic Analysis of Online Local Private Learning with SGD
Differentially Private Stochastic Gradient Descent (DP-SGD) has been widely used for solving optimization problems with privacy guarantees in machine learning and statistics. Despite this, a systematic non-asymptotic convergence analysis for DP-SGD, particularly in the context of online problems and local differential privacy (LDP) models, remains largely elusive. Existing non-asymptotic analyses have focused on non-private optimization methods, and hence are not applicable to privacy-preservin…

Traveling waves in a continuum model for schooling swimmers
Anand U. Oza, Eva Kanso, Michael J. Shelley
https://arxiv.org/abs/2507.06095 https://

Traveling waves in a continuum model for schooling swimmers
The complex formations exhibited by schooling fish have long been the object of fascination for biologists and physicists. However, the physical and sensory mechanisms leading to organized collective behavior remain elusive. On the physical side in particular, it is unknown how the flows generated by individual fish influence the collective patterns that emerge in large schools. To address this question, we here present a continuum theory for a school of swimmers in an inline formation. The swi…

Detecting Lifshitz Transitions Using Nonlinear Conductivity in Bilayer Graphene
Tanweer Ahmed, Harsh Varshney, Bao Q. Tu, Kenji Watanabe, Takashi Taniguchi, Marco Gobbi, F\`elix Casanova, Amit Agarwal, Luis E. Hueso
https://arxiv.org/abs/2507.05871

Detecting Lifshitz Transitions Using Nonlinear Conductivity in Bilayer Graphene
The second-order nonlinear electrical response (NLER) is an intrinsic property of inversion symmetry-broken systems which can provide deep insights into the electronic band structures of atomically thin quantum materials. However, the impact of Fermi surface reconstructions, also known as Lifshitz transitions, on the NLER has remained elusive. We investigated NLER in bilayer graphene (BLG), where the low-energy bands undergo Lifshitz transitions. Here, NLER undergoes a sign change near the Lifs…

Intrinsic physical properties of flexible van der Waals semiconductor InSe
Jacob Svane, Kim-Khuong Huynh, Yong P. Chen, Bo Brummerstedt Iversen
https://arxiv.org/abs/2508.02142 …

Intrinsic physical properties of flexible van der Waals semiconductor InSe
InSe is a van der Waals semiconductor in which mechanical flexibility, high electronic mobility, and non-trivial electronic structures converge, making it an attractive platform for both intriguing fundamental studies and promising device developments. However, the nucleation and growth of phase-pure, intrinsic InSe crystals require stringent thermodynamical conditions, and have therefore remained elusive. Since InSe melts incongruently, the widely used synthesis methods based on cooling of a 1…

Thank you! Great history! Great Prmary sources. Great interpretations that modern minds can see and believe. It's a bunch of posts, AND they're all worth it.
#History #USHistory #Independence

Dr. D. Elisabeth Glassco (@Deglassco@mastodon.social)
Attached: 1 image It was known, then, that the British would leave. The war was all but lost. The colonies would no longer be colonies. For white Loyalists, exile was bitter. For Black Loyalists, it was not exile. It was escape—or re-enslavement. 4/20 Image. Boston King, “Memoirs of the Life of Boston King, a Black Preacher. Written by Himself, during his Residence at Kingswood-School,” Methodist Magazine, March-June 1798.

AI-based Clinical Decision Support for Primary Care: A Real-World Study
Robert Korom, Sarah Kiptinness, Najib Adan, Kassim Said, Catherine Ithuli, Oliver Rotich, Boniface Kimani, Irene King'ori, Stellah Kamau, Elizabeth Atemba, Muna Aden, Preston Bowman, Michael Sharman, Rebecca Soskin Hicks, Rebecca Distler, Johannes Heidecke, Rahul K. Arora, Karan Singhal

AI-based Clinical Decision Support for Primary Care: A Real-World Study
We evaluate the impact of large language model-based clinical decision support in live care. In partnership with Penda Health, a network of primary care clinics in Nairobi, Kenya, we studied AI Consult, a tool that serves as a safety net for clinicians by identifying potential documentation and clinical decision-making errors. AI Consult integrates into clinician workflows, activating only when needed and preserving clinician autonomy. We conducted a quality improvement study, comparing outcome…

Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence
M. Mootz, C. Vaswani, C. Huang, K. J. Lee, A. Khatri, P. Mandal, J. H. Kang, L. Luo, I. E. Perakis, C. B. Eom, J. Wang
https://arxiv.org/abs/2507.22383

Observation of Superconducting Solitons by Terahertz-Light-Driven Persistent Pseudo-Spin Coherence
Overcoming the decoherence bottleneck remains a central challenge for advancing coherent superconducting quantum device and information technologies. Solitons -- non-dispersive wave packets stabilized by the collective synchronization of quantum excitations -- offer a robust pathway to mitigating dephasing, yet their realization in superconductors has remained experimentally elusive. Here, we report the observation of a driven soliton state in epitaxial thin films of an iron-based superconducto…

Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe$_2$
Sebastian Buchberger, Yann in 't Veld, Akhil Rajan, Philip A. E. Murgatroyd, Brendan Edwards, Bruno K. Saika, Naina Kushwaha, Maria H. Visscher, Jan Berges, Dina Carbone, Jacek Osiecki, Craig Polley, Tim Wehling, Phil D. C. King
https:/…

Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe$_2$
TiSe$_2$ has long been considered one of the best candidate materials to host the elusive excitonic insulator (EI) phase. However, a finite coupling to the lattice can generically be expected, while a lack of "smoking-gun" signatures for the importance of the electron-hole interaction in driving the phase transition has rendered it challenging to distinguish the EI from the conventional charge-density-wave (CDW) phase. Here, we demonstrate a new approach, exploiting the susceptibility of excito…

Background Measurements and Simulations of the ComPair Balloon Flight
Zachary Metzler, Nicholas Kirschner, Lucas Smith, Nicholas Cannady, Makoto Sasaki, Daniel Shy, Regina Caputo, Carolyn Kierans, Aleksey Bolotnikov, Thomas J. Caligiure, Gabriella A. Carini, A. Wilder Crosier, Jack Fried, Priyarshini Ghosh, Sean Griffin, J. Eric Grove, Elizabeth Hays, Sven Herrmann, Emily Kong, Iker Liceaga-Indart, Julie McEnery, John Mitchell, A. A. Moiseev, Lucas Parker, Jeremy Perkins, Bernard Phlip…

Background Measurements and Simulations of the ComPair Balloon Flight
ComPair, a prototype of the All-sky Medium Energy Gamma-ray Observatory (AMEGO), completed a short-duration high-altitude balloon campaign on August 27, 2023 from Fort Sumner, New Mexico, USA. The goal of the balloon flight was the demonstration of ComPair as both a Compton and Pair telescope in flight, rejection of the charged particle background, and measurement of the background $γ$-ray spectrum. This analysis compares measurements from the balloon flight with Monte Carlo simulations to ben…

Exciton photoemission from a ground state of a solid Ta2Pd3Te5
Siwon Lee, Kyung-Hwan Jin, SeongJin Kwon, Hyunjin Jung, Choongjae Won, Sang-Wook Cheong, Gil Young Cho, Jaeyoung Kim, Han Woong Yeom
https://arxiv.org/abs/2507.16453

Exciton photoemission from a ground state of a solid Ta2Pd3Te5
Excitons are bosonic quasiparticles with a variety of applications in optoelectronics, photosyn thesis, and dissipationless informatics, and their lifetime can become sufficiently long to form a quantum condensate. While exciton condensation has been predicted to occur as a ground state of a solid, so called an excitonic insulator, whose material realization has been elusive. Here we report the observation of direct photoemission signals from excitons in a ground state of a very recent excitoni…