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arXiv 0710.3465cond-mat.stat-mechcond-mat.dis-nn
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具有自由表面的无序系统的临界行为

Critical Behavior of Disordered Systems with a Free Surface

S. V. Belim

摘要:

本文用群论的双圈近似直接在三维空间中描述了具有自由边界的均匀和无序系统的行为。揭示了自由边界对体临界行为的影响。结果表明,系统的有界性略有影响的情况下,普通过渡的散装临界行为的政权,而这种影响是更显着的情况下的特殊过渡。描述了均匀和无序系统的表面临界现象,并在双环近似下计算了临界指数。结果表明,杂质对特殊相变的影响不明显,而对普通相变的影响则更为显著。导出的临界指数与计算机模拟结果进行了比较。

英文摘要:

The behavior of homogeneous and disordered systems with a free boundary is described on the basis of group theory in the two-loop approximation directly in three-dimensional space. The effect of the free boundary on the regime of the bulk critical behavior is revealed. It is shown that the boundedness of the system slightly affects the regime of the bulk critical behavior in the case of the ordinary transition, whereas this effect is more noticeable in the case of the special transition. Surface critical phenomena are described for homogeneous and disordered systems, and the critical exponents are calculated in the two-loop approximation. It is shown that the effect of impurities is insignificant in the special phase transition, whereas it is more noticeable in the ordinary phase transition. The derived critical exponents are compared with the computer-simulation results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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