Anisotropic uniqueness classes for a degenerate parabolic equation

Abstract

Using density functional theory and quantum transport calculations based on nonequilibum Green's function formalism, we investigate the charge transport properties of endohedral M @C 20 (M = Na and K) metallofullerenes. Our results show that the conductance of C 20 fullerene can be obviously improved by insertion of alkali atom at its centre. Both linear and nonlinear sections are found on the I-V curves of the Au-M @C 20 -Au two-probe systems. The novel negative differential resistance behaviour is also observed in Na@C 20 molecule but not in K@C 20 .