Universal collisionless transport of graphene
Universal collisionless transport of graphene
复制标题
石墨烯的通用无碰撞传输
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Schmalian
中科院分区：
文献类型：
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作者：
J. Link;P. P. Orth;D. Sheehy;J. Schmalian
电子-电子库仑相互作用对石墨烯光学导电性的影响引发了一场争论，质疑这种和其他狄拉克材料中无碰撞输运的普遍性。利用晶格计算避免了以前的节点Dirac方法中存在的发散，我们的工作解决了这一争议，并在很大的频率范围内获得了与实验定量一致的结果。我们还证明，如果在修改的维度上正确地实现理论的正则化，则维度正则化方法是一致的。即使计入原子轨道波函数的非零值，紧束缚晶格和节块Dirac理论的计算在低能下也是一致的，从而最终证明了石墨烯光学导电性的普适性。
The impact of the electron-electron Coulomb interaction on the optical conductivity of graphene has led to a controversy that calls into question the universality of collisionless transport in this and other Dirac materials. Using a lattice calculation that avoids divergences present in previous nodal Dirac approaches, our work settles this controversy and obtains results in quantitative agreement with experiment over a wide frequency range. We also demonstrate that dimensional regularization methods agree, if the regularization of the theory in modified dimensions is correctly implemented. Tight-binding lattice and nodal Dirac theory calculations are shown to coincide at low energies even when the nonzero size of the atomic orbital wave function is included, conclusively demonstrating the universality of the optical conductivity of graphene.