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Physica A Statistical Mechanics and its Applications

Spin dynamics of random Ising chain in coexisting transverse and longitudinal magnetic fields

Zhongqiang Liu, Surong Jiang, Xiang-Mu Kong, Yu-Liang Xu

Published Jan 9, 2017• 6 citations
Publisher
DOI
10.1016/j.physa.2016.12.057

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We study the time dependent behavior of the four-spin interactions Ising chain in the presence of a disordered transverse magnetic field. In order to analyze the effects of field randomness in the dynamical behavior of the system we calculate the time-dependent correlation function and the longitudinal relaxation function of the infinite chain. We consider a bi-modal distribution for the field energy strength, where one of its values equals the exchange coupling energy while the other value can be lower or higher than the coupling energy. We find that an increasing concentration of weaker fields produces an enhancement of the central mode behavior. However, when the concentration of stronger fields increases, the system undergoes a crossover from central mode to collective-type dynamics.