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arXiv 1105.0935cond-mat.stat-mechcond-mat.str-el
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$(1+1)$维紧致和非紧致量子耗散$Z_4$模型的临界性

Criticality of compact and noncompact quantum dissipative $Z_4$ models in $(1+1)$ dimensions

Einar B. Stiansen, Iver Bakken Sperstad, Asle Sudbø

摘要:

利用大规模Monte Carlo方法,我们研究了具有欧姆键耗散的$(1+1)D$ $Z_4$对称模型的两个版本。在其中一个版本中,变量被限制为区间$[0,2π>$,而在另一个版本中,域不受限制。紧凑模型的特点是一个完全有序的相位与破缺的$Z_4$对称性和无序相,分离的临界线。非紧模型具有三个阶段。除了紧凑模型所显示的两相外,还存在具有各向同性准长程序的中间相。我们计算的动力学临界指数$z$沿临界线的两个模型,看看是否紧凑的变量是相关的空间和虚时间之间的临界标度。在这方面,两种模型之间似乎没有区别,我们发现$z\approx1$的单一相变的紧凑模型,以及在非紧凑模型的两个过渡。

英文摘要:

Using large-scale Monte Carlo computations, we study two versions of a $(1+1)D$ $Z_4$-symmetric model with Ohmic bond dissipation. In one of these versions, the variables are restricted to the interval $[0,2π>$, while the domain is unrestricted in the other version. The compact model features a completely ordered phase with a broken $Z_4$ symmetry and a disordered phase, separated by a critical line. The noncompact model features three phases. In addition to the two phases exhibited by the compact model, there is also an intermediate phase with isotropic quasi-long-range order. We calculate the dynamical critical exponent $z$ along the critical lines of both models to see if the compactness of the variable is relevant to the critical scaling between space and imaginary time. There appears to be no difference between the two models in that respect, and we find $z\approx1$ for the single phase transition in the compact model as well as for both transitions in the noncompact model.

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