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arXiv 0712.0801cond-mat.dis-nncond-mat.stat-mech
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具有相关无序的弹性系统:对倾斜的响应及其在表面生长中的应用

Elastic systems with correlated disorder: Response to tilt and application to surface growth

Andrei A. Fedorenko

摘要:

我们研究弹性系统,如界面或晶格钉扎的相关淬火无序考虑两种不同类型的相关性:广义柱状无序和淬火缺陷相关为~ x^{-a}的大间距x。利用泛函重整化群方法,我们得到了两圈阶的临界指数,并计算了对横场h的响应。相关无序违反了统计倾斜对称性,导致对倾斜的非线性响应。具有柱状无序的弹性系统表现出横向迈斯纳效应:无序产生临界场h_c,在该临界场h_c以下对倾斜没有响应,在该临界场h_c以上倾斜角表现为θ~(h-h_c)^θ,且普适指数<1。这描述了由磁场倾斜引起的柱状无序的II型超导体中弱玻色玻璃的破坏。对于各向同性长程关联无序,线性倾斜模量在小场处消失,导致幂律响应θ~ h^n,其中n>1。将所得结果应用于具有时间相关噪声的Kardar-Parisi-Zhang方程。

英文摘要:

We study elastic systems such as interfaces or lattices pinned by correlated quenched disorder considering two different types of correlations: generalized columnar disorder and quenched defects correlated as ~ x^{-a} for large separation x. Using functional renormalization group methods, we obtain the critical exponents to two-loop order and calculate the response to a transverse field h. The correlated disorder violates the statistical tilt symmetry resulting in nonlinear response to a tilt. Elastic systems with columnar disorder exhibit a transverse Meissner effect: disorder generates the critical field h_c below which there is no response to a tilt and above which the tilt angle behaves as θ~ (h-h_c)^ϕ with a universal exponent ϕ<1. This describes the destruction of a weak Bose glass in type-II superconductors with columnar disorder caused by tilt of the magnetic field. For isotropic long-range correlated disorder, the linear tilt modulus vanishes at small fields leading to a power-law response θ~ h^ϕ with ϕ>1. The obtained results are applied to the Kardar-Parisi-Zhang equation with temporally correlated noise.

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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