Search results for " spin dynamics"

showing 3 items of 3 documents

Quasi-Lie Brackets and the Breaking of Time-Translation Symmetry for Quantum Systems Embedded in Classical Baths

2018

Many open quantum systems encountered in both natural and synthetic situations are embedded in classical-like baths. Often, the bath degrees of freedom may be represented in terms of canonically conjugate coordinates, but in some cases they may require a non-canonical or non-Hamiltonian representation. Herein, we review an approach to the dynamics and statistical mechanics of quantum subsystems embedded in either non-canonical or non-Hamiltonian classical-like baths which is based on operator-valued quasi-probability functions. These functions typically evolve through the action of quasi-Lie brackets and their associated Quantum-Classical Liouville Equations, or through quasi-Lie brackets a…

Hybrid quantum-classical systemBreaking of time-translation symmetry; Classical spin dynamics; Hybrid quantum-classical systems; Langevin dynamics; Nosé-Hoover dynamics; Quantum-classical Liouville equation; Quasi-lie brackets; Computer Science (miscellaneous); Chemistry (miscellaneous); Mathematics (all); Physics and Astronomy (miscellaneous)Physics and Astronomy (miscellaneous)General MathematicsDegrees of freedom (physics and chemistry)FOS: Physical sciencesNosé-Hoover dynamic02 engineering and technologyQuasi-lie bracketLangevin dynamics01 natural sciencesbreaking of time-translation symmetrysymbols.namesakeLangevin dynamicClassical spin dynamic0103 physical sciencesComputer Science (miscellaneous)010306 general physicsLangevin dynamicsquantum-classical Liouville equationPhysicsQuantum Physicsquasi-lie bracketslcsh:MathematicsObservableStatistical mechanicsclassical spin dynamicslcsh:QA1-939021001 nanoscience & nanotechnologyAction (physics)Nosé–Hoover dynamicsClassical mechanicsGeometric phaseChemistry (miscellaneous)Phase spacesymbolshybrid quantum-classical systemsNoether's theorem0210 nano-technologyQuantum Physics (quant-ph)
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Dzyaloshinskii-Moriya and dipole-dipole interactions affect coupling-based Landau-Majorana-Stückelberg-Zener transitions

2020

It has been theoretically demonstrated that two spins (qubits or qutrits), coupled by exchange interaction only, undergo a coupling-based joint Landau-Majorana-St\"uckelberg-Zener (LMSZ) transition when a linear ramp acts upon one of the two spins. Such a transition, under appropriate conditions on the parameters, drives the two-spin system toward a maximally entangled state. In this paper, effects on the quantum dynamics of the two qudits, stemming from the Dzyaloshinskii-Moriya (DM) and dipole-dipole (d-d) interactions, are investigated qualitatively and quantitatively. The enriched Hamiltonian model of the two spins, shares with the previous microscopic one the same C2-symmetry which onc…

PhysicsQuantum PhysicsCondensed matter physicsSpin dynamicsQuantum entanglementCondensed Matter::Mesoscopic Systems and Quantum Hall Effect01 natural sciencesPhysics::History of Physics010305 fluids & plasmasCoupling (physics)MAJORANADipole0103 physical sciencesCondensed Matter::Strongly Correlated ElectronsPhysics::Atomic PhysicsZener diode010306 general physicsDipolar interaction Dzyaloshinskii-Moriya interaction Entanglement production Landau-Zener effect Quantum entanglement Spin dynamicsPhysical Review Research
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Linear and nonlinear spin dynamics in multi-domain magnetoelastic antiferromagnets

2021

Antiferromagnets have recently surged as the prominent material platform for the next generation spintronics devices. Despite the remarkable abundance of antiferromagnets and the variety of their spin textures in nature, they share a widely common, if not ubiquitous, feature. Magnetoelasticity, which is expressed as strictions of different origin, relativistic and/or exchange, significantly contributes to the magnetic anisotropy of antiferromagnets. Crucially, a general theoretical framework able to address the role of domain walls on the spin dynamics in antiferromagnets in the presence of magnetoelasticity is lacking. Here we tackle this problem developing a very general macroscopic pheno…

PhysicsAcoustics and UltrasonicsSpin dynamicsSpintronicsCondensed Matter PhysicsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsDomain (software engineering)Nonlinear systemMagnetic anisotropytheory antiferromagnets spin dynamics nonlinear phenomenaPhenomenological modelAntiferromagnetismCondensed Matter::Strongly Correlated Electronsddc:530Statistical physicsSpin-½
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