期刊
PHYSICAL REVIEW B
卷 82, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.235402
关键词
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资金
- Netherlands Organization for Scientific Research (NWO)
- NSF [DMR-00-84173, DMR-0955561]
- NSERC of Canada
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0955561] Funding Source: National Science Foundation
We provide detailed calculation of the ac conductivity in the case of 1/r Coulomb interacting massless Dirac particles in graphene in the collisionless limit when omega >> T. The analysis of the electron self-energy, current vertex function, and polarization function, which enter into the calculation of physical quantities including the ac conductivity, is carried out by checking the Ward-Takahashi identities associated with the electrical charge conservation and making sure that they are satisfied at each step. We adopt a variant of the dimensional regularization of Veltman and 't Hooft by taking the spatial dimension D=2-epsilon for epsilon>0. The procedure adopted here yields a result for the conductivity correction which, while explicitly preserving charge conservation laws, is nevertheless different from the results reported previously in literature.
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