期刊
PHYSICAL REVIEW B
卷 82, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.155412
关键词
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资金
- FCT [PTDC/FIS/101434/2008]
- MCI [FIS2010-21883-C02-02]
- Fundação para a Ciência e a Tecnologia [PTDC/FIS/101434/2008] Funding Source: FCT
We discuss the dynamical current-current correlation function of the hexagonal lattice using a local current operator defined on a continuum-replica model of the original lattice model. In the Dirac approximation, the correlation function can be decomposed into a parallel and perpendicular contribution. We show that this is not possible for the hexagonal lattice even in the Dirac regime. A comparison between the analytical isotropic solution and the numerical results for the honeycomb lattice is given.
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