Abstract
We develop a microscopic theory for ac transport using nonequilibrium Green's-function theory. By including the self-consistent Coulomb interaction, the current conserving and gauge-invariant conditions are satisfied. On the theoretical side, our theory can be used to calculate nonlinear ac transport properties order by order at finite frequency when the system is driven far from equilibrium. In addition, the nonlinear ac charge response such as ac electrochemical capacitance can also be calculated. On the application side, our theory can be coupled to the density-functional theory to numerically predict the ac transport properties of nanodevices.
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