Short-Time Dynamics of the Random n-Vector Model |
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Authors: | CHEN Yuan LI Zhi-Bing FANG Hai HE Shun-Shan SITU Shu-Ping |
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Affiliation: | 1. Department of Physics, Guangzhou University, Guangzhou 510405, China;2. Department of Physics, Zhongshan University, Guangzhou 510275, China |
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Abstract: | Short-time critical behavior of the random n-vector model is studied by the theoretic renormalization-group approach.Asymptotic scaling laws are studied in a frame of the expansion in ε = 4 - d for n ≠ 1 and √ε for n = 1respectively.In d < 4,the initial slip exponents θ′ for the order parameter and θ for the response function are calculated up to the second order in ε = 4 - d for n ≠ 1 and √ε for n = 1 at the random fixed point respectively.Our results show that the random impurities exert a strong influence on the short-time dynamics for d < 4 and n < nc. |
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Keywords: | n-vector model short-time critical dynamics quenched impurities initial slip exponent |
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