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arXiv 1502.06829cond-mat.stat-mech
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类石墨烯结构中排阻驱动流的动力学

Dynamics of driven flow with exclusion in graphene-like structures

R. B. Stinchcombe, S. L. A. de Queiroz

摘要:

我们提出了一个平均场论的动力学驱动流排斥在类石墨烯结构,并数值检验其预测。我们对待第一个特定的结合键transmittrates,平均场预测,和数值在很大程度上证实,蜂窝网络的亚晶格结构特性变得无关紧要。在由开边界注入率和喷射率确定的相图的各个区域中,动力学一般与一维系统的动力学相同,尽管在平均场论和数值结果之间仍存在一些差异,对于两种几何形状来说,差异是相似的。然而,在临界点的特征指数是z = 3/2在一个维度上,平均场值z = 2接近非常大的系统与恒定(有限)的纵横比。我们还治疗债券(和边界)利率的第二种组合,更典型的是,亚晶格的区别持续存在。对于这两种速率的组合,在连续或后期的限制,分别,耦合组的平均场动力学方程变得易于处理的各种技术,并给出了一个两个波段的频谱,在临界阶段的间隙。虽然第二速率组合之间的平均场论和模拟的定量差异增加的大多数属性和边界速率的调查,理论仍然是定性正确的一般,并给出了一个相当好的定量帐户的功能,如后期的演化密度分布差异从其稳态值。

英文摘要:

We present a mean-field theory for the dynamics of driven flow with exclusion in graphenelike structures, and numerically check its predictions. We treat first a specific combination of bond transmissivity rates, where mean field predicts, and numerics to a large extent confirms, that the sublattice structure characteristic of honeycomb networks becomes irrelevant. Dynamics, in the various regions of the phase diagram set by open boundary injection and ejection rates, is then in general identical to that of one-dimensional systems, although some discrepancies remain between mean-field theory and numerical results, in similar ways for both geometries. However, at the critical point for which the characteristic exponent is z = 3/2 in one dimension, the mean-field value z = 2 is approached for very large systems with constant (finite) aspect ratio. We also treat a second combination of bond (and boundary) rates where, more typically, sublattice distinction persists. For the two rate combinations, in continuum or late-time limits, respectively, the coupled sets of mean-field dynamical equations become tractable with various techniques and give a two-band spectrum, gapless in the critical phase. While for the second rate combination quantitative discrepancies between mean-field theory and simulations increase for most properties and boundary rates investigated, theory still is qualitatively correct in general, and gives a fairly good quantitative account of features such as the late-time evolution of density profile differences from their steady-state values.

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