期刊
PHYSICAL REVIEW B
卷 78, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.075433
关键词
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资金
- FCT [SFRH/BPD/27182/2006]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/27182/2006] Funding Source: FCT
We study the distribution of vacuum polarization charge induced by a Coulomb impurity in massive graphene. By analytically computing the polarization function, we show that the charge density is distributed in space in a nontrivial fashion and on a characteristic length-scale set by the effective Compton wavelength. The density crosses over from a logarithmic behavior below this scale to a power-law variation above it. Our results in the continuum limit are confirmed by explicit diagonalization of the corresponding tight-binding model on a finite-size lattice. Electron-electron interaction effects are also discussed.
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