Results 11 to 20 of about 430,460 (294)
CLASSICAL RELATIVISTIC SPIN PARTICLES [PDF]
Condensed Matter Physics, 1998 Relativistic spin particles are approached from the stand point of Hamiltonian actions of Poincare group on itself. The several possible solutions are classified and realizations are given in terms of Dirac???s constraints formalism.
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Classical observables from coherent-spin amplitudes
Journal of High Energy Physics, 2021 The quantum field-theoretic approach to classical observables due to Kosower, Maybee and O’Connell provides a rigorous pathway from on-shell scattering amplitudes to classical perturbation theory.
Rafael Aoude, Alexander Ochirov
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Quantum Brownian motion for magnets
New Journal of Physics, 2022 Spin precession in magnetic materials is commonly modelled with the classical phenomenological Landau–Lifshitz–Gilbert (LLG) equation. Based on a quantized three-dimensional spin + environment Hamiltonian, we here derive a spin operator equation of ...
J Anders, C R J Sait, S A R Horsley
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Semi-classical simulation of spin-1 magnets
Physical Review Research, 2022 Theoretical studies of magnets have traditionally concentrated on either classical spins, or the extreme quantum limit of spin-1/2. However, magnets built of spin-1 moments are also intrinsically interesting, not least because they can support quadrupole,
Kimberly Remund +4 more
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Decay of spin-spin correlations in disordered quantum and classical spin chains
Physical Review Research, 2020 The real-time dynamics of equal-site correlation functions is studied for one-dimensional spin models with quenched disorder. Focusing on infinite temperature, we present a comparison between the dynamics of models with different quantum numbers S=1/2,1 ...
Jonas Richter +2 more
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Universal emergence of the one-third plateau in the magnetization process of frustrated quantum spin chains [PDF]
, 2006 We present a numerical study of the magnetization process of frustrated quantum spin-S chains with S=1, 3/2, 2 as well as the classical limit. Using the exact diagonalization and density-matrix renormalization techniques, we provide evidence that a ...
A. E. Feiguin +13 more
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Multi-$Q$ hexagonal spin density waves and dynamically generated spin-orbit coupling: time-reversal invariant analog of the chiral spin density wave [PDF]
, 2016 We study hexagonal spin-channel ("triplet") density waves with commensurate $M$-point propagation vectors. We first show that the three $Q=M$ components of the singlet charge density and charge-current density waves can be mapped to multi-component $Q=0$
Venderbos, J. W. F.
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Classicality of spin states [PDF]
Physical Review A, 2008 We extend the concept of classicality in quantum optics to spin states. We call a state ``classical'' if its density matrix can be decomposed as a weighted sum of angular momentum coherent states with positive weights. Classical spin states form a convex set C, which we fully characterize for a spin-1/2 and a spin-1.
Giraud, Olivier +2 more
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Extreme Quantum Advantage when Simulating Classical Systems with Long-Range Interaction
Scientific Reports, 2017 Classical stochastic processes can be generated by quantum simulators instead of the more standard classical ones, such as hidden Markov models. One reason for using quantum simulators has recently come to the fore: they generally require less memory ...
Cina Aghamohammadi +2 more
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On classical models of Spin [PDF]
Foundations of Physics Letters, 1992 The reason for recalling this old paper is the ongoing discussion on the attempts of circumventing certain assumptions leading to the Bell theorem (Hess-Philipp, Accardi). If I correctly understand the intentions of these Authors, the idea is to make use of the following logical loophole inherent in the proof of the Bell theorem: Probabilities of ...
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