Results 21 to 30 of about 2,518 (86)

Electric‐Current‐Assisted Nucleation of Zero‐Field Hopfion Rings

Advanced Materials, EarlyView.
This work reports a novel and efficient nucleation protocol for 3D localized topological magnetic solitons‐hopfion rings in chiral magnets using pulsed electric currents. By using Lorentz transmission electron microscopy and topological analysis, we report characteristic features and extraordinary stability of hopfion rings in zero or inverted external
Xiaowen Chen, Dongsheng Song, Filipp N. Rybakov, Nikolai S. Kiselev, Long Li, Wen Shi, Rui Wu, Xuewen Fu, Olle Eriksson, Stefan Blügel, Rafal E. Dunin‐Borkowski, Haifeng Du, Fengshan Zheng   +12 more
wiley   +1 more source

Enhancement of Calcium Ion Permeation via Resonant Coupling of Ion and Terahertz Waves in Voltage Gated Calcium Channels

Advanced Science, EarlyView.
We introduce a novel, ion‐targeted strategy to enhance calcium permeation in voltage gated calcium channels. By directly driving the ions’ coherent collective motion via resonant coupling with a 1.65 THz field, we lower the inter‐site energy barrier, inducing a statistically significant enhancement of ion influx.
Zihao Zhang, Yuankun Sun, Xinqiao Zhou, Sunchao Huang, Shengpeng Yang, Shaomeng Wang, Yubin Gong   +6 more
wiley   +1 more source

On semiclassical dispersion relations of Harper-like operators

, 2004
We describe some semiclassical spectral properties of Harper-like operators, i.e. of one-dimensional quantum Hamiltonians periodic in both momentum and position.
Aubry S, Azbel M Ya, Azbel M Ya, Brüning J, Brüning J, Brüning J, Buslaev V S, Demikhovskii V Ya, Faure F, Filonov N, Harper P G, Hatsugai Y, Helffer B, Konstantin Pankrashkin, Last Y, Maslov V P, Thouless D J, Watson G I, Wilkinson M   +18 more
core   +2 more sources

Factorization Machine‐Based Active Learning for Functional Materials Design with Optimal Initial Data

Advanced Intelligent Discovery, EarlyView.
This work investigates the optimal initial data size for surrogate‐based active learning in functional material optimization. Using factorization machine (FM)‐based quadratic unconstrained binary optimization (QUBO) surrogates and averaged piecewise linear regression, we show that adequate initial data accelerates convergence, enhances efficiency, and ...
Seongmin Kim, In‐Saeng Suh
wiley   +1 more source

B^F Theory and Flat Spacetimes

, 1993
We propose a reduced constrained Hamiltonian formalism for the exactly soluble $B \wedge F$ theory of flat connections and closed two-forms over manifolds with topology $\Sigma^3 \times (0,1)$.
C. Misner, C. Teitelboim, E. Achucarro, E. Martinec, E. Witten, F. Lobell, G. 't Hooft, G.D. Mostow, G.F.R. Ellis, G.T. Horowitz, H. Poincaré, H. Waelbroeck, H. Waelbroeck, Henri Waelbroeck, J.A. Wolf, J.L. Friedman, P.A.M. Dirac, W.P. Thurston   +17 more
core   +1 more source

Comparison of DeePMD, MTP, GAP, ACE and MACE Machine‐Learned Potentials for Radiation‐Damage Simulations: A User Perspective

Advanced Intelligent Discovery, EarlyView.
The authors evaluated six machine‐learned interatomic potentials for simulating threshold displacement energies and tritium diffusion in LiAlO2 essential for tritium production. Trained on the same density functional theory data and benchmarked against traditional models for accuracy, stability, displacement energies, and cost, Moment Tensor Potential ...
Ankit Roy, Ram Devanathan, Sarah Allec, Giridhar Nandipati, Andrew M. Casella, David J. Senor, Duane D. Johnson, Ganesh Balasubramanian, Ayoub Soulami   +8 more
wiley   +1 more source

Non-contractible Periodic Orbits in Hamiltonian Dynamics on Closed Symplectic Manifolds

, 2016
We study Hamiltonian diffeomorphisms of closed symplectic manifolds with non-contractible periodic orbits. In a variety of settings, we show that the presence of one non-contractible periodic orbit of a Hamiltonian diffeomorphism of a closed toroidally ...
Ginzburg, Viktor L., Gurel, Basak Z.
core   +1 more source

Synergistic Fe–Si Dual‐Site Pathway Engineering in Biomass‐Derived Carbon Matrix for High‐Performance Oxygen Reduction Reaction

Carbon Energy, EarlyView.
We report a dual‐atomic Si–Fe–N–C catalyst synthesized from nitrogen‐rich pinecones and an Fe porphyrin precursor. The inherent Si and N in pinecones form a porous Si–N–C framework that stabilizes Fe atoms during pyrolysis, yielding robust Si–Fe dual sites.
Min Su Cho, Yanmei Zang, Sung Joon Park, Byeong‐Seon An, Ho Jin Lee, Ashishi Gaur, Ghulam Ali, Mingony Kim, Kyung Yoon Chung, Sungbin Park, Yung‐Eun Sung, Daehae Kim, Ki Jae Kim, Chang Woo Myung, HyukSu Han   +14 more
wiley   +1 more source

Branes wrapping black holes as a purely gravitational dielectric effect

, 2005
In this paper we give a microscopical description of certain configurations of branes wrapping black hole horizons in terms of dielectric gravitational waves.
A. Hashimoto, D. Gaiotto, D. Gaiotto, Diego Rodríguez-Gómez, J. McGreevy, K. Dasgupta, M. Sheikh-Jabbari, M.T. Grisaru, R.C. Myers, S. McNamara, S. Thomas, S.R. Das ., V. Sahakian, V. Sahakian, Y. Lozano   +14 more
core   +1 more source

Invariant Measure and Universality of the 2D Yang–Mills Langevin Dynamic

Communications on Pure and Applied Mathematics, EarlyView.
ABSTRACT We prove that the Yang–Mills (YM) measure for the trivial principal bundle over the two‐dimensional torus, with any connected, compact structure group, is invariant for the associated renormalised Langevin dynamic. Our argument relies on a combination of regularity structures, lattice gauge‐fixing and Bourgain's method for invariant measures ...
Ilya Chevyrev, Hao Shen
wiley   +1 more source