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Effects of Gaussian disorder on the dynamics of the random transverse Ising model
Liu, ZQ; Kong, XM; Chen, XS; Kong, XM , Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China
2006
发表期刊PHYSICAL REVIEW B
ISSN1098-0121
卷号73期号:22页码:-
摘要The effects of Gaussian disorder on the dynamics of the one-dimensional spin-1/2 random transverse Ising model are studied in the high-temperature limit by the recursion method. Both spin autocorrelation functions and the corresponding spectral densities are calculated for three types of disordered cases. It is found that when the standard deviation sigma(J) of the exchange coupling (or the standard deviation sigma(B) of the random transverse field) is small, the dynamics of the system undergoes two crossovers in sequence as the mean value of the exchange coupling (or the random transverse field) varies: from a central-peak behavior to a collective-mode one, and then to the precession of free spins in an external transverse magnetic field. However, when sigma(J) or sigma(B) are large enough, there is no crossover, i.e., the dynamics of the system shows a central-peak behavior and a disordered behavior, respectively.
部门归属Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China; Chinese Acad Sci, Interdisciplinary Ctr Theoret Studies, Beijing 100080, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Dimensional Xy-model Continued-fraction Representation Generalized Langevin Equation Spin-correlation-functions Infinite Temperature Recurrence Relations 4-spin Interactions Finite-temperature Chain Field
学科领域Physics
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收录类别SCI
WOS记录号WOS:000238696300058
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5971
专题理论物理所SCI论文
通讯作者Kong, XM , Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China
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GB/T 7714
Liu, ZQ,Kong, XM,Chen, XS,et al. Effects of Gaussian disorder on the dynamics of the random transverse Ising model[J]. PHYSICAL REVIEW B,2006,73(22):-.
APA Liu, ZQ,Kong, XM,Chen, XS,&Kong, XM , Qufu Normal Univ, Dept Phys, Qufu 273165, Peoples R China.(2006).Effects of Gaussian disorder on the dynamics of the random transverse Ising model.PHYSICAL REVIEW B,73(22),-.
MLA Liu, ZQ,et al."Effects of Gaussian disorder on the dynamics of the random transverse Ising model".PHYSICAL REVIEW B 73.22(2006):-.
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