Conductance and polarization in quantum junctions
| dc.creator | Bokes, P. | |
| dc.creator | Godby, R. W. | |
| dc.date | 2004-03-08 | |
| dc.date.accessioned | 2026-07-07T02:56:49Z | |
| dc.date.available | 2026-07-07T02:56:49Z | |
| dc.description | We revisit the expression for the conductance of a general nanostructure -- such as a quantum point contact -- as obtained from the linear response theory. We show that the conductance represents the strength of the Drude singularity in the conductivity $σ(k,k';iω\to 0)$. Using the equation of continuity for electric charge we obtain a formula for conductance in terms of polarization of the system. This identification can be used for direct calculation of the conductance for systems of interest even at the {\it ab-initio} level. In particular, we show that one can evaluate the conductance from calculations for a finite system without the need for special ``transport'' boundary conditions. | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0403204 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0403204 | |
| dc.identifier | Phys. Rev. B 69, 245420 (2004). | |
| dc.identifier | doi:10.1103/PhysRevB.69.245420 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/23480 | |
| dc.subject | Materials Science | |
| dc.subject | Mesoscale and Nanoscale Physics | |
| dc.title | Conductance and polarization in quantum junctions | |
| dc.type | text |