Tootfinder

Will be interesting to see if they let them land with the obviously defective capsule.
It would be Very Bad™ for Boeing and NASA if they decide to let them and something happens (obviously also bad for astronauts).
https://hachyderm.io/@thomasfuchs/112572855335942200

This https://arxiv.org/abs/2403.03439 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hept…

Line defect half-indices of $SU(N)$ Chern-Simons theories
We study the Wilson line defect half-indices of 3d $\mathcal{N}=2$ supersymmetric $SU(N)$ Chern-Simons theories of level $k\le -N$ with Neumann boundary conditions for the gauge fields, together with 2d Fermi multiplets and fundamental 3d chiral multiplets to cancel the gauge anomaly. We derive some exact results and also make some conjectures based on expansions of the $q$-series. We find several interesting connections with special functions known in the literature, including Rogers-Ramanujan…

Aperiodic fragments in periodic solids: Eliminating the need for supercells and background charges in electronic structure calculations of defects
Robert H. Lavroff, Daniel Kats, Lorenzo Maschio, Nikolay Bogdanov, Ali Alavi, Anastassia N. Alexandrova, Denis Usvyat
https://arxiv.org/abs/2406.03373…

Aperiodic fragments in periodic solids: Eliminating the need for supercells and background charges in electronic structure calculations of defects
To date, computational methods for modeling defects (vacancies, adsorbates, etc.) rely on periodic supercells in which the defect is far enough from its repeated image such that they can be assumed non-interacting. Defects in real solids, however, can be spaced microns or more apart, whereas affordable supercells for density functional theory calculations are no wider than a few nanometers. The relative proximity and periodic repetition of the defect's images may lead to unphysical artifacts, e…

This https://arxiv.org/abs/2311.00698 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Crystalline topological defects within response theory
Crystal defects can highlight interesting quantum features by coupling to the low-energy Hamiltonian $H$. Here we show that independently of this $H$ coupling, topological crystalline defects can generate new features by directly modifying the response theory of electric field probes such as Raman scattering. To show this we consider an antiferromagnetic spin-1/2 model $H_{spin}$ on a zigzag chain. Crystalline domain walls between two zigzag domains appear as at most local defects in $H_{spin}$…

Quadruple-well ferroelectricity and moderate switching barrier in defective wurtzite {\alpha}-Al3S3: a first-principles study
Yuto Shimomura, Saneyuki Ohno, Katsuro Hayashi, Hirofumi Akamatsu
https://arxiv.org/abs/2406.04084

Quadruple-well ferroelectricity and moderate switching barrier in defective wurtzite α-Al3S3: a first-principles study
Wurtzite-type ferroelectrics are highly promising for next-generation microelectronic devices due to their ferroelectric properties and integration with exiting semiconductors. However, their high coercive fields, which are close to breakdown electric fields, need to be lowered. To deal with this issue and secure device reliability, much effort has been devoted to exploring novel wurtzite compounds with lower polarization switching barriers and implementing doping strategies. Here, we report fi…

Electronic structure of topological defects in the pair-density-wave superconductor
Marcus Rosales, Eduardo Fradkin
https://arxiv.org/abs/2406.03538 https:…

Electronic structure of topological defects in the pair-density-wave superconductor
Pair density Waves (PDW) are a inhomogeneous superconducting states whose Cooper pairs posses a finite momentum resulting in a oscillatory gap in space, even in the absence of an external magnetic field. There is growing evidence for the existence of PDW superconducting order in many strongly correlated materials particularly in the cuprate superconductios and in several other different types of systems. A feature of the PDW state is that inherently it has a CDW as a composite order associated …

This https://arxiv.org/abs/2404.15400 has been replaced.
link: https://scholar.google.com/scholar?q=a

Holographic scattering and non-minimal RT surfaces
In the AdS/CFT correspondence, the causal structure of the bulk AdS spacetime is tied to entanglement in the dual CFT. This relationship is captured by the connected wedge theorem, which states that a bulk scattering process implies the existence of $O(1/G_N)$ entanglement between associated boundary subregions. In this paper, we study the connected wedge theorem in two asymptotically AdS$_{2+1}$ spacetimes: the conical defect and BTZ black hole geometries. In these settings, we find that bulk …

Optical read and write of spin states in organic diradicals
Rituparno Chowdhury, Petri Murto, Naitik A. Panjwani, Yan Sun, Pratyush Ghosh, Yorrick Boeije, Vadim Derkach, Seung-Je Woo, Oliver Millington, Daniel G. Congrave, Yao Fu, Tarig B. E. Mustafa, Miguel Monteverde, Jes\'us Cerd\'a, Jan Behrends, Akshay Rao, David Beljonne, Alexei Chepelianskii, Hugo Bronstein, Richard H. Friend

Optical read and write of spin states in organic diradicals
Optical control and read-out of the ground state spin structure has been demonstrated for defect states in crystalline semiconductors, including the diamond NV- center, and these are promising systems for quantum technologies. Molecular organic semiconductors offer synthetic control of spin placement, in contrast to current limitations in these crystalline systems. Here we report the discovery of spin-optical addressability in a diradical molecule that comprises two trityl radical groups couple…

This https://arxiv.org/abs/2405.06966 has been replaced.
initial toot: https://mastoxiv.page/@a…

Low temperature dynamics and kinetics of dislocation motion in the high-entropy alloy Al$_{0.5}$CoCrCuFeNi
An analysis of the processes of plastic deformation and acoustic relaxation in a high-entropy alloy Al$_{0.5}$CoCrCuFeNi was carried out. The following have been established: dominant dislocation defects; types of barriers that prevent the movement of dislocations; mechanisms of thermally activated movement of various elements of dislocation lines through barriers at room and low temperatures. Based on modern dislocation theory, quantitative estimates have been obtained for the most important c…

This https://arxiv.org/abs/2403.13673 has been replaced.
initial toot: https://mastoxiv.page/@a…

Employing constrained non-negative matrix factorization for microstructure segmentation
Materials characterization using electron backscatter diffraction (EBSD) requires indexing the orientation of the measured region from Kikuchi patterns. The quality of Kikuchi patterns can degrade due to pattern overlaps arising from two or more orientations, in the presence of defects or grain boundaries. In this work we employ constrained non-negative matrix factorization to segment a microstructure with small grain misorientations,< 1 degree, and predict the amount of pattern overlap. First …