Tuning the effective fine structure constant in graphene: opposing effects of dielectric screening on short-and long-range potential scattering
- Tuning the effective fine structure constant in graphene: opposing effects of dielectric screening on short-and long-range potential scattering
- 장차운; S. Adam; J.-H. Chen; E. D.Williams; S. Das Sarma; M. S. Fuhrer
- Issue Date
- Physical review letters
- VOL 101, NO 14, 146805-1-146805-4
- We reduce the dimensionless interaction strength α in graphene by adding a water overlayer in ultrahigh vacuum, thereby increasing dielectric screening. The mobility limited by long-range impurity scattering is increased over 30%, due to the background dielectric constant enhancement leading to a reduced interaction of electrons with charged impurities. However, the carrier-density-independent conductivity due to short-range impurities is decreased by almost 40%, due to reduced screening of the impurity potential by conduction electrons. The minimum conductivity is nearly unchanged, due to canceling contributions from the electron-hole puddle density and long-range impurity mobility. Experimental data are compared with theoretical predictions with excellent agreement.
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