Results 51 to 60 of about 146,281 (291)

Low‐Symmetry Weyl Semimetals: A Path to Ideal Topological States

Advanced Functional Materials, EarlyView.
This study presents a theoretical framework for realizing ideal Weyl semimetals, where Weyl nodes are well‐isolated at the Fermi level. The approach is exemplified in the low‐symmetry material Cu2SnSe3, which exhibits tunable topological phases, current‐induced orbital magnetization, and a strong circular photogalvanic effect, making it a promising ...
Darius‐Alexandru Deaconu, Varun Shah, Rodion Vladimirovich Belosludov, Mohammad Saeed Bahramy   +3 more
wiley   +1 more source

A minimally invasive neurostimulation method for controlling abnormal synchronisation in the neuronal activity. [PDF]

PLoS Computational Biology, 2018
Many collective phenomena in Nature emerge from the -partial- synchronisation of the units comprising a system. In the case of the brain, this self-organised process allows groups of neurons to fire in highly intricate partially synchronised patterns and
Malbor Asllani, Paul Expert, Timoteo Carletti   +2 more
doaj   +1 more source

Quantum free energy differences from non-equilibrium path integrals: I. Methods and numerical application

, 2008
The imaginary-time path integral representation of the canonical partition function of a quantum system and non-equilibrium work fluctuation relations are combined to yield methods for computing free energy differences in quantum systems using non ...
B. J. Berne, G. Parisi, Gilles H. Peslherbe, H. Goldstein, Jeremy Schofield, Lisandro Hernández de la Peña, M. Abramowitz, M. Parinello, R. P. Feynman, R. P. Feynman, Ramses van Zon, W. H. Press   +11 more
core   +1 more source

Symmetry Enhanced Unconventional Spin Current Anisotropy in a Collinear Antiferromagnet

Advanced Functional Materials, EarlyView.
Spin‐orbit torques (SOTs) are investigated in epitaxial FeSn, a topological antiferromagnet with kagome lattice symmetry. Combining experimental and theoretical approaches, the study identifies a six‐fold conventional damping‐like spin‐orbit torque (DL SOT), along with the coexistence of both six‐fold and uniaxial unconventional field‐like torque (FL ...
Pankhuri Gupta, Kacho Imtiyaz Ali Khan, Akash Kumar, Pratik Sahu, Rekha Agarwal, Artem Litvinenko, Nidhi Kandwal, Ram Singh Yadav, Birabar Ranjit Kumar Nanda, Johan Åkerman, Pranaba Kishor Muduli   +10 more
wiley   +1 more source

Quantum Property Preservation

PRX Quantum
Quantum property preservation (QPP) is the problem of maintaining a target property of a quantum system for as long as possible. This problem arises naturally in the context of open quantum systems subject to decoherence.
Kumar Saurav, Daniel A. Lidar
doaj   +1 more source

Magnetic‐Field Tuning of the Spin Dynamics in the Quasi‐2D Van der Waals Antiferromagnet CuCrP2S6

Advanced Functional Materials, EarlyView.
This study reveals 2D character of the spin dynamics in CuCrP2S6, as well as complex field dependence of collective excitations in the antiferromagnetically ordered state. Their remarkable tuning from the antiferromagnetic to the ferromagnetic type with magnetic field, together with the non‐degeneracy of the magnon gaps favorable for the induction of ...
Joyal John Abraham, Yaqian Guo, Yuliia Shemerliuk, Sebastian Selter, Saicharan Aswartham, Kranthi Kumar Bestha, Laura T. Corredor, Anja U. B. Wolter, Olga Kataeva, Luka Rogić, Noah Somun, Damjan Pelc, Oleg Janson, Jeroen van den Brink, Bernd Büchner, Vladislav Kataev, Alexey Alfonsov   +16 more
wiley   +1 more source

Deterministic Epidemic Models for Ebola Infection with Time-Dependent Controls

Discrete Dynamics in Nature and Society, 2020
In this paper, we have studied epidemiological models for Ebola infection using nonlinear ordinary differential equations and optimal control theory.
Eric Okyere, Johnson De-Graft Ankamah, Anthony Kodzo Hunkpe, Dorcas Mensah   +3 more
doaj   +1 more source

Velocity Observer Design for Tether Deployment in Hamiltonian Framework

Aerospace
This paper presents a nonlinear velocity observer of tether deployment using the immersion and invariance technique, and the velocity observer design problem is recast as a problem of designing an attractive and invariant manifold inside the Hamiltonian ...
Jihang Yang, Guanzheng Chen, Mingming Zhang, Gangqiang Li, Jinyu Liu   +4 more
doaj   +1 more source

Magnetic‐Field Dependent VB− Spin Decoherence in Hexagonal Boron Nitrides: A First‐Principles Study

Advanced Functional Materials, EarlyView.
This study investigates the decoherence of the VB− defect in h‐BN under external magnetic fields using first‐principles quantum many‐body simulations. A transition boundary distinguishing distinct decoherence regimes is identified, with its dependence on isotopic composition.
Jaewook Lee, Hyeonsu Kim, Huijin Park, Hosung Seo   +3 more
wiley   +1 more source

Operator theoretic approach to optimal control problems characterized by the Caputo fractional differential equations

Results in Control and Optimization, 2023
In this paper, our aim is to solve an optimal control problem by using an operator theoretic approach in the sense of Caputo fractional derivative. We first reduce the fractional dynamical system into an equivalent Hammerstein operator equation and then ...
M. Vellappandi, V. Govindaraj
doaj   +1 more source