Quantum conductance of homogeneous and inhomogeneous interacting electron systems

Details Quantum conductance of homogeneous and inhomogeneous interacting electron systems Quantum conductance of homogeneous and inhomogeneous interacting electron systems

2006-04-12

arxiv.org/abs/cond-mat/0604317v1

Physics

Condensed Matter

Materials Science

for resolution of the here published results see Phys. Rev. B 76, 125433 (2007)

Scientific paper

We obtain the conductance of a system of electrons connected to leads, within time-dependent density-functional theory, using a direct relation between the conductance and the density response function. Corrections to the non-interacting conductance appear as a consequence of the functional form of the exchange-correlation kernel at small frequencies and wavevectors. The simple adiabatic local-density approximation and non-local density-terms in the kernel both give rise to significant corrections in general. In the homogeneous electron gas, the former correction remains significant, and leads to a failure of linear-response theory for densities below a critical value.

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