Floquet Dynamics in a One-Dimensional Chain in the Multipulse Spin Locking of Nuclear Magnetic Resonance

The dynamics of a one-dimensional chain that consists of 10–14 dipolar-coupled nuclear spins, is placed in an external magnetic field, and is irradiated by a periodic sequence of resonant π/ n pulses ( n is a natural number) with the same time delay 2τ between them has been studied. The numerical ca...

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Bibliographic Details
Published in:JETP letters 2020-12, Vol.112 (11), p.715-719
Main Authors: Bochkin, G. A., Vasil’ev, S. G., Fedorova, A. V., Fel’dman, E. B.
Format: Article
Language:English
Subjects:
Atomic
Biological and Medical Physics
Biophysics
Chains
Condensed Matter
Dipoles
Locking
Molecular
NMR
Nuclear magnetic resonance
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
Thermodynamic equilibrium
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Summary:The dynamics of a one-dimensional chain that consists of 10–14 dipolar-coupled nuclear spins, is placed in an external magnetic field, and is irradiated by a periodic sequence of resonant π/ n pulses ( n is a natural number) with the same time delay 2τ between them has been studied. The numerical calculation has shown that thermodynamic equilibrium, which is determined by the common temperature of the Zeeman and dipole reservoirs, is established in the spin system at the average pulse field π/(2 n τ) ∼ ω loc (where ω loc is the dipole frequency and n > 2) and times t ∼ ω loc −1 . The relaxation of the magnetization in the system irradiated by (π/2) x pulses at π/4τ ≫ π loc is due to a four-spin resonant process, and the relaxation rate is proportional to τ 4 .
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364020230046