Abstract
We derive an expression for the four-point conductance of a general quantum junction in terms of the density response function. Our formulation allows us to show that the four-point conductance of an interacting electronic system possessing either a geometrical constriction and/or an opaque barrier becomes identical to the macroscopically measurable two-point conductance. Within time-dependent density-functional theory the formulation leads to a direct identification of the functional form of the exchange-correlation kernel that is important for the conductance. We demonstrate the practical implementation of our formula for a metal-vacuum-metal interface.
Original language | English |
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Article number | 125433 |
Pages (from-to) | - |
Number of pages | 8 |
Journal | Physical Review B |
Volume | 76 |
Issue number | 12 |
DOIs | |
Publication status | Published - Sept 2007 |
Bibliographical note
© 2007 American Physical Society. This is an author produced version of a paper published in Physical Review B. Uploaded in accordance with the publisher's self archiving policy.Keywords
- DENSITY-FUNCTIONAL THEORY
- LANDAUER FORMULA
- LINEAR-RESPONSE
- TRANSPORT