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Dynamics of one-dimensional random quantum XY system with Dzyaloshinskii–Moriya interaction |
Li Yin-Fang (李银芳), Kong Xiang-Mu (孔祥木) |
Shandong Provincial Key Laboratory of Laser Polarization and Information Technology,Department of Physics, Qufu Normal University, Qufu 273165, China |
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Abstract In this paper, the effects of random variables on the dynamics of the s=1/2 XY model with the Dzyaloshinskii–Moriya interaction are studied. By means of the recurrence relation method in the high-temperature limit, we calculate the spin autocorrelation functions as well as the corresponding spectral densities for the cases that the exchange couplings between spins or external magnetic fields satisfy the double-Gaussian distribution. It is found that when the standard deviation of random exchange coupling δj (or the standard deviation of random external field δB) is small, the dynamics of the system undergoes a crossover from a collective-mode behavior to a central-peak one. However, when δJ (or δB) is large, the crossover vanishes, and the system shows a central-peak behavior or the most disordered one. We also analyze the cases in which the exchange couplings or the external fields satisfy the bimodal and the Gaussian distributions. Our results show that for all the cases considered, the dynamics of the above system is similar to that of the one-dimensional random XY model.
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Received: 22 June 2012
Revised: 26 September 2012
Accepted manuscript online:
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PACS:
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75.10.Pq
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(Spin chain models)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.40.Gb
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(Dynamic properties?)
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75.50.Lk
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(Spin glasses and other random magnets)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10775088), the Shandong Natural Science Foundation, China (Grant No. Y2006A05), and the Science Foundation of Qufu Normal University, China. |
Corresponding Authors:
Kong Xiang-Mu
E-mail: kongxm@mail.qfnu.edu.cn
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Cite this article:
Li Yin-Fang (李银芳), Kong Xiang-Mu (孔祥木) Dynamics of one-dimensional random quantum XY system with Dzyaloshinskii–Moriya interaction 2013 Chin. Phys. B 22 037502
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