Simulation of Rabi oscillations in random clusters of spins deposited on spherical surface
https://doi.org/10.26907/mrsej-25305
Abstract
The study presents results of first-principles modeling of spin dynamics in disordered ensembles of impurity-induced magnetic moments in a carbon spherical structure near 1% concentration of magnetic centers. Averaged signals of Rabi oscillations and their spectra are evaluated using a numerical algorithm based on direct calculation of quantum eigenstates. The Fourier spectrum includes a strong peak around the Rabi frequency and an additional rise in the low-frequency interval. Both peaks demonstrate the standard broadening proportional to the dipole interaction energy. Low-frequency oscillations are observed only for random spin clusters, while regular structures do not produce such dynamics. This effect results from quasi-periodic spin dynamics caused by random distances between particles and, correspondingly, the realization of a set of incommensurate eigenfrequencies in the spin dynamics. Thus, the low-frequency part of the spectrum can be used to characterize spatial disorder in ensembles of spin clusters.
About the Authors
E. I. Kovycheva
Perm State University
Russian Federation
Russian Federation
Perm 614068
K. B. Tsiberkin
Perm State University
Russian Federation
Russian Federation
Perm 614068
V. K. Henner
Perm State University; University of Louisville
United States
United States
Perm 614068, Russia
Louisville KY 40292, USA
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Review
For citations:
Kovycheva E.I., Tsiberkin K.B., Henner V.K. Simulation of Rabi oscillations in random clusters of spins deposited on spherical surface. Magnetic Resonance in Solids. 2025;27(3):25305 (12 pp.). https://doi.org/10.26907/mrsej-25305
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