scholarly journals Nonequilibrium quantum spin dynamics from two-particle irreducible functional integral techniques in the Schwinger boson representation

2018 ◽  
Vol 98 (22) ◽  
Author(s):  
A. Schuckert ◽  
A. Piñeiro Orioli ◽  
J. Berges
Keyword(s):  
Spin Dynamics ◽  
Functional Integral ◽  
Quantum Spin ◽  
Boson Representation

scholarly journals Dichotomy in temporal and thermal spin correlations observed in the breathing pyrochlore LiGa1−xInxCr4O8

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
S. Lee ◽  
S.-H. Do ◽  
W. Lee ◽  
Y. S. Choi ◽  
J. van Tol ◽  
...  
Keyword(s):  
Time Scale ◽  
Spin Dynamics ◽  
Muon Spin ◽  
Quantum Spin ◽  
Spin Liquid ◽  
Fast Time ◽  
Spin Liquids ◽  
Magnetic Ground State ◽  
Spin Correlations ◽  
Magnetic Specific Heat

AbstractA breathing pyrochlore system is predicted to host a variety of quantum spin liquids. Despite tremendous experimental and theoretical efforts, such sought-after states remain elusive as perturbation terms and lattice distortions lead to magnetic order. Here, we utilize bond alternation and disorder to tune a magnetic ground state in the Cr-based breathing pyrochlore LiGa1−xInxCr4O8. By combining thermodynamic and magnetic resonance techniques, we provide experimental signatures of a spin-liquid-like state in x = 0.8, namely, a nearly T2-dependent magnetic specific heat and persistent spin dynamics by muon spin relaxation (μSR). Moreover, 7Li NMR, ZF-μSR, and ESR unveil the temporal and thermal dichotomy of spin correlations: a tetramer singlet on a slow time scale vs. a spin-liquid-like state on a fast time scale. Our results showcase that a bond disorder in the breathing pyrochlore offers a promising route to disclose exotic magnetic phases.

Magnetic Excitations

2020 ◽  
pp. 257-310
Author(s):  
Andrew T. Boothroyd
Keyword(s):  
Crystal Field ◽  
Spin Dynamics ◽  
Random Phase ◽  
Wave Theory ◽  
Quantum Spin ◽  
Dynamical Response ◽  
Magnetic Clusters ◽  
Quantum Spin Chains ◽  
Magnetic Systems ◽  
Scattering Spectrum

In this chapter, the neutron inelastic scattering spectrum is calculated for a variety of magnetic systems. A number of isolated magnetic systems are considered, including single-ion crystal field and intermultiplet excitations, and magnetic clusters. Linear spin-wave theory, a method for calculating the collective spin dynamics in magnetically ordered systems, is outlined and applied to ferromagnets and antiferromagnets both with and without anisptropy. The Random Phase Approximation (RPA) method for the generalized susceptibility is presented and applied to calculate the spectrum of crystal field excitons in praseodymium. The nature of the spin excitations in itinerant magnets is described, and the generalized susceptibility is calculated in the RPA for itinerant electrons with echange correlations. General features of the spin dynamical response in quantum magnets are described, and illustrated by the magnetic spectra of quantum spin chains.

Quantum spin dynamics of antiferromagnetic ring with central excess spin

2001 ◽  
Vol 121 (1-3) ◽  
pp. 1788-1789
Author(s):  
H. Saito ◽  
K. Kinugawa ◽  
Y. Ohta ◽  
H. Nagao ◽  
K. Yamaguchi ◽  
...  
Keyword(s):  
Spin Dynamics ◽  
Quantum Spin

Influence of He+-ion beam induced effect on ultrafast quantum spin-state switching dynamics in exchange bias Co–Mn FM/AFM systems

2020 ◽  
Vol 34 (27) ◽  
pp. 2050294
Author(s):  
Oleg V. Farberovich ◽  
Mikhail Mazuritskiy
Keyword(s):  
Exchange Bias ◽  
Pulse Magnetic Field ◽  
Spin Dynamics ◽  
Ion Beam ◽  
Quantum Spin ◽  
Quantum Circuits ◽  
Spin Hamiltonian ◽  
Dm Interaction ◽  
State Switching ◽  
Switching Dynamics

A study of magnetic or spin logic appears as an appealing alternative due to its nonvolatile character, which can boost up switching on/off. The influences of Dzyaloshinskii–Moriya (DM) interaction on non-classical correlations play an important role in foundations of quantum technologies such as quantum information and quantum computation. We have considered the anisotropic general spin Hamiltonian (GSH) model in presence of DM interaction in addition to the Landau–Lifshitz–Gilbert (LLG)-model in a pulse magnetic field. For study of ultrafast spin dynamics in exchange bias Co–Mn FM/AFM systems, we present some quantum circuits for a deterministic quantum computing in Co–Mn FM/AFM systems.

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