Tootfinder

cats doing defect triage
"if report unclear, push off countertop"
"nothng is higher-pri than wet food"
"if bug, eat it"

Intrinsic defects and 4d/5d transition metal defects in Cr$_2$O$_3$: pathways to enhance the N\'eel temperature
Xuecong Wang, Sai Mu
https://arxiv.org/abs/2506.10883

Intrinsic defects and 4d/5d transition metal defects in Cr$_2$O$_3$: pathways to enhance the Néel temperature
First-principles calculations are employed to explore avenues to increase the Néel temperature ($T_{\mathrm{N}}$) of the magnetoelectric antiferromagnet Cr$_2$O$_3$ through doping. Employing the hybrid functional method, we calculate the formation energy of intrinsic defects and transition metal dopants (Mo, W, Nb, Ta, Zr, and Hf) to assess their likelihood of formation. Intrinsic defect calculations indicate that Cr interstitials and oxygen vacancies dominate under Cr-rich conditions, whereas…

🎶 Noninvasive ultrasound technique can spot bad batteries before they malfunction
https://techxplore.com/news/2025-06-noninvasive-ultrasound-technique-bad-batteries.html

Noninvasive ultrasound technique can spot bad batteries before they malfunction
A recent uptick in battery-related fires has drawn attention to the challenge of identifying defects that can cause these catastrophic malfunctions, but are rarely obvious to the naked eye. In hopes of preventing the dangerous glitches that can cause batteries to overheat and catch fire, researchers from Drexel University have developed a standard testing process to give manufacturers a better look at the internal workings of batteries.

Hydrodynamics of chiral nematics in a channel and sudden contraction geometry
Isreal Morawo, Dana Grecov
https://arxiv.org/abs/2506.11933 https://

Hydrodynamics of chiral nematics in a channel and sudden contraction geometry
This study investigates the influence of chirality, viscous effects, and confinement geometry on the flow dynamics and defect structures of cholesteric liquid crystals (CLCs) using numerical simulations. As chiral strength increases, $π$-twist defects form at low chirality and progressively organize into hexagonal domains resembling blue phase--like (BP-like) structures at higher chirality. At sufficiently high chirality and aspect ratios, skyrmion-like configurations emerge, indicating the fo…

Bulk Excitations of Invertible Phases
Wenjie Ji, David T. Stephen, Michael Levin, Xie Chen
https://arxiv.org/abs/2506.11288 https://a…

Bulk Excitations of Invertible Phases
Recent developments in the study of topological defects highlight the importance of understanding the multi-dimensional structure of bulk excitations inside a quantum system. When the bulk ground state is trivial, i.e. a product state, excitations on top of it are decoupled from each other and correspond to lower-dimensional phases and their defects within. In this paper, we expand the discussion to invertible phases and study the bulk excitations in, for example, SPT phases, Majorana chains, p…

Exact requirements for battery-assisted qubit gates
Riccardo Castellano, Vasco Cavina, Mart\'i Perarnau-Llobet, Pavel Sekatski, Vittorio Giovannetti
https://arxiv.org/abs/2506.11855

Exact requirements for battery-assisted qubit gates
We consider the implementation of a unitary gate on a qubit system S via a global energy-preserving operation acting on S and an auxiliary system B that can be seen as a battery. We derive a simple, asymptotically exact expression for the implementation error as a function of the battery state, which we refer to as the it Unitary Defect. Remarkably, this quantity is independent of the specific gate being implemented, highlighting a universal property of the battery itself. We show that minimizi…

Never forget that “Capitalists’ misdeeds are often dumb rather than sinister.” https://defector.com/how-we-got-here?giftLink=4c0709d22c394a90b5e8bf4412f737c6#:~:text=Ca…

Chiral algebra correlators of the $6$d, $\mathcal{N}=(2,0)$ theory with a defect
Konstantinos C. Rigatos
https://arxiv.org/abs/2506.09132 https://

Chiral algebra correlators of the $6$d, $\mathcal{N}=(2,0)$ theory with a defect
We revisit the computation of $2$-point correlation functions of $\tfrac{1}{2}$-BPS operators in the $6$d, $\mathcal{N}=(2,0)$ theory in the presence of a surface defect. We focus on the protected sector described by the chiral algebra and reproduce its correlators using a bootstrap approach. A unique feature of this calculation is that we can completely determine the answer by using bulk-channel data only. We, also, perform the operator expansion in the defect channel which provide new predict…

First-principles characterization of native defects and oxygen impurities in GaAs
Khang Hoang
https://arxiv.org/abs/2506.07954 https://

First-principles characterization of native defects and oxygen impurities in GaAs
We present an investigation of native point defects and oxygen impurities in gallium arsenide (GaAs) using hybrid density-functional calculations. Defects are characterized by their structural, electronic, and optical properties. Dominant native defects are Ga antisites (Ga$_{\rm As}$), As antisites (As$_{\rm Ga}$), and/or Ga vacancies ($V_{\rm Ga}$) in which As$_{\rm Ga}$ and $V_{\rm Ga}$ are charge-compensating defects under As-rich conditions. On the basis of the calculated defect transition…

Nanoscale Magnetic Resonance Imaging and Control of a Strongly Interacting Dipolar System
Piotr Put, Nathaniel T. Leitao, Christina Spaegele, Haoyang Gao, Oksana Makarova, Bartholomeus Machielse, Hengyun Zhou, Federico Capasso, Leigh S. Martin, Hongkun Park, Mikhail D. Lukin
https://arxiv.org/abs/2506.11920

Nanoscale Magnetic Resonance Imaging and Control of a Strongly Interacting Dipolar System
Magnetic Resonance Imaging (MRI) is a fundamental tool for physical and life sciences, yet its spatial resolution is typically limited to macroscopic scales. Here, we demonstrate nanoscale MRI by combining strong, time-dependent local magnetic field gradients with coherent control of a dense ensemble of electron spins hosted in atom-like defects in diamond. Using this platform, we generate and manipulate nanoscale spin textures - spatially structured patterns of spin orientation - and track the…