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arXiv 0903.4235cond-mat.dis-nncond-mat.stat-mech
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用长程相互作用诱发的大雪崩探测短程自旋玻璃时发现零液滴刚度指数$θ$

Zero Droplet Stiffness Exponent $θ$ is Revealed in Short Range Spin Glasses when Probed with Large Avalanches Induced by Long Range Interactions

Ferenc Pazmandi, Gergely T. Zimanyi

摘要:

我们探测液滴激发短程自旋玻璃中加入微扰长程相互作用,衰减与距离的幂律:$J/r^σ$。结果表明,如果幂律指数$σ$小于空间维数$d$,扰动诱导大规模雪崩滚动,直到他们迫使系统开发的稳定性的激发谱中的伪间隙。这使得微扰长程相互作用与$σ< σ_c = d$相关。液滴理论预测临界指数$σ_c$取决于液滴刚度指数为$σ_c=d-θ$。结合这两个结果导致在短程自旋玻璃的液滴理论中的零刚度指数$θ= 0$。

英文摘要:

We probe the droplet excitations in short range spin glasses by adding a perturbative long range interaction that decays with distance as a power law: $J/r^σ$. It is shown that if the power law exponent $σ$ is smaller than the spatial dimension $d$, the perturbation induces large scale avalanches which roll until they force the system to develop a pseudo gap in the excitation spectrum of the stabilities. This makes the perturbative long range interactions relevant for $σ< σ_c = d$. The droplet theory predicts that the critical exponent $σ_c$ depends on the droplet stiffness exponent as $σ_c=d-θ$. Combining these two results leads to a zero stiffness exponent $θ= 0$ in the droplet theory of short range spin glasses.

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