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Minimum conductivity of graphene and its bilayer

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Theoretical studies<br />

Eduardo Fradkin (1986)<br />

Boltzamann Eq. is not<br />

proper for Dirac Fermions<br />

Other theories<br />

Lee 1993<br />

Ludwig 1994<br />

Morita 1997<br />

Ziegler 1998<br />

Peres 2005<br />

Gusynin 2005<br />

Katsnelson 2006<br />

Tworzydlo 2006<br />

Cserti 2006<br />

Ostrovsky 2006<br />

Kubo formula<br />

Main reasons behind<br />

minimum <strong>conductivity</strong><br />

Intrinsic Impurities<br />

Self-doping<br />

Electron-hole puddles<br />

Macroscopic inhomogeneity<br />

Interactions<br />

Masslessness <strong>of</strong> carriers<br />

Chirality<br />

…<br />

٤

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