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arXiv 1104.0037cond-mat.dis-nncond-mat.stat-mech
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正方晶格上高斯无规键伊辛模型的零温临界性

Zero-temperature criticality in the Gaussian random bond Ising model on a square lattice

Olga Dimitrova

摘要:

用图形展开法高精度地求出了正方形晶格上二维高斯随机键伊辛模型的自由能和比热。在低温下,比热揭示了由幂律$C\propto T^{1+α}$描述的零温临界性,其中$α= 0.55(8)$。解释的自由能在独立的两级激发给出的状态密度,在低能量下遵循一个新的幂律$ρ(ε)\propto ε^α$。找到了该模型的一个精确的高温序列,直到$β^{29}$项,并证明了在低能时单格点自旋翻转态密度为零。

英文摘要:

The free energy and the specific heat of the two-dimensional Gaussian random bond Ising model on a square lattice are found with high accuracy using graph expansion method. At low temperatures the specific heat reveals a zero-temperature criticality described by the power law $C\propto T^{1+α}$, with $α= 0.55(8)$. Interpretation of the free energy in terms of independent two-level excitations gives the density of states, that follows a novel power law $ρ(ε)\propto ε^α$ at low energies. An exact high-temperature series for this model up to the term $β^{29}$ is found. A proof that the density of one-site spin flip states vanishes at low energy is given.

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