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Quantum Critical Behavior In A Graphenelike Model

机译:石墨烯模型中的量子临界行为

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We present the results of numerical simulations of a (2+1)-dimensional fermion field theory based on a recent proposal for a model of graphene consisting of N_f four-component Dirac fermions moving in the plane and interacting via an instantaneous Coulomb interaction. In the strong-coupling limit we identify a critical number of flavors N_(fc)=4.8(2) separating an insulating from a conducting phase. This transition corresponds to the location of a quantum critical point, and we use a fit to the equation of state for the chiral order parameter to estimate the critical exponents. Next we simulate N_f=2 corresponding to real graphene and approximately locate a transition from strong- to weak-coupling behavior. Strong correlations are evident in the weak-coupling regime.
机译:我们提出了基于(2 + 1)维费米子场论的数值模拟结果,该理论基于最近提出的石墨烯模型的模型,该模型由N_f个四组分狄拉克费米子在平面中移动并通过瞬时库仑相互作用进行相互作用。在强耦合极限中,我们确定了将绝缘体与导电相分开的临界数量的风味N_(fc)= 4.8(2)。这种转变对应于量子临界点的位置,并且我们使用手性阶数参数的状态方程拟合来估算临界指数。接下来,我们模拟对应于实际石墨烯的N_f = 2并大致定位从强耦合行为到弱耦合行为的过渡。在弱耦合机制中,存在明显的相关性。

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