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arXiv 1002.1273cond-mat.str-el
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石墨烯的紧致晶格理论中的一级手征跃迁和改进作用量的情况

First-order chiral transition in the compact lattice theory of graphene and the case for improved actions

Joaquín E. Drut, Timo A. Lähde, Lauri Suoranta

摘要:

本文比较了石墨烯低能理论的紧凑和非紧凑晶格版本。紧理论被发现表现出手征相变,这似乎是一级,在临界耦合β_c = 0.42 +/- 0.01。我们证实了非紧理论在β_c = 0.072 +/- 0.003处表现出二级跃迁,并确定了在这两种情况下紫外发散蝌蚪贡献的影响.在非紧理论的蝌蚪改进后,我们发现β_c^{TI} = 0.163 +/- 0.002,这加强了在强库仑耦合下石墨烯中的半金属-绝缘体转变的情况。最后,我们强调需要使用改进的晶格行动进行系统的研究。

英文摘要:

A comparison of the compact and non-compact lattice versions of the low-energy theory of graphene is presented. The compact theory is found to exhibit a chiral phase transition which appears to be of first order, at a critical coupling of beta_c = 0.42 +/- 0.01. We confirm that the non-compact theory exhibits a second-order transition at beta_c = 0.072 +/- 0.003, and determine the effects of UV-divergent tadpole contributions in both cases. Upon tadpole improvement of the non-compact theory we find beta_c^{TI} = 0.163 +/- 0.002, which strengthens the case for a semimetal-insulator transition in graphene at strong Coulomb coupling. Finally, we highlight the need for systematic studies using improved lattice actions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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