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arXiv 0809.4671cond-mat.dis-nncond-mat.stat-mech
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无序弹性系统动力学中的热效应

Thermal Effects in the dynamics of disordered elastic systems

S. Bustingorry, A. B. Kolton, A. Rosso, W. Krauth, T. Giamarchi

摘要:

许多看似不同的宏观系统(磁体,铁电体,CDW,涡旋,...)可以被描述为一般的无序弹性系统。因此,从基础物理学和实际应用的角度来看,理解它们的静态和动态都提出了具有挑战性的问题。尽管取得了重要进展,但仍有许多问题有待解决。特别是温度对这些系统响应外力的方式有显著的影响。我们在这里解决的重要问题的热效应接近脱钉,以及这些影响是否可以理解的类比与标准的临界现象,类比,以便了解零温度的情况下有用。我们发现,接近脱钉力的温度导致一个四舍五入的脱钉过渡,并计算相应的指数。此外,使用一种新的算法,它是可能的,以精确地研究接近脱钉的行为,并表明,普遍接受的类比脱钉与临界现象不完全成立,因为没有发散的长度尺度存在于稳定状态下的属性的线的脱钉阈值以下。

英文摘要:

Many seemingly different macroscopic systems (magnets, ferroelectrics, CDW, vortices,..) can be described as generic disordered elastic systems. Understanding their static and dynamics thus poses challenging problems both from the point of view of fundamental physics and of practical applications. Despite important progress many questions remain open. In particular the temperature has drastic effects on the way these systems respond to an external force. We address here the important question of the thermal effect close to depinning, and whether these effects can be understood in the analogy with standard critical phenomena, analogy so useful to understand the zero temperature case. We show that close to the depinning force temperature leads to a rounding of the depinning transition and compute the corresponding exponent. In addition, using a novel algorithm it is possible to study precisely the behavior close to depinning, and to show that the commonly accepted analogy of the depinning with a critical phenomenon does not fully hold, since no divergent lengthscale exists in the steady state properties of the line below the depinning threshold.

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