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arXiv 1104.3515cond-mat.stat-mechcond-mat.dis-nnmath-phmath.MP
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低维量子系统一级跃迁的淬火无序舍入证明

Proof of Rounding by Quenched Disorder of First Order Transitions in Low-Dimensional Quantum Systems

Michael Aizenman, Rafael L. Greenblatt, Joel L. Lebowitz

摘要:

我们证明了对于d<=2维的量子晶格系统,在正温度和T=0时,加入淬火无序使相应共轭序参量中的任何一级相变都圆化。对于具有连续对称性的系统,该陈述扩展到d<=4维。这为量子系统建立了伊姆里-马现象的存在,经典系统的伊姆里-马现象由艾泽曼和韦尔证明。通过在热力学量而不是平衡态的水平上进行分析,实现了证明到量子系统的扩展。

英文摘要:

We prove that for quantum lattice systems in d<=2 dimensions the addition of quenched disorder rounds any first order phase transition in the corresponding conjugate order parameter, both at positive temperatures and at T=0. For systems with continuous symmetry the statement extends up to d<=4 dimensions. This establishes for quantum systems the existence of the Imry-Ma phenomenon which for classical systems was proven by Aizenman and Wehr. The extension of the proof to quantum systems is achieved by carrying out the analysis at the level of thermodynamic quantities rather than equilibrium states.

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