Conductance of a quantum point contact based on spin-density-functional theory

Details Conductance of a quantum point contact based on spin-density-functional theory Conductance of a quantum point contact based on spin-density-functional theory

2007-03-14

arxiv.org/abs/cond-mat/0703380v1

Phys. Rev. B 76 045338 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.045338

We present full quantum mechanical conductance calculations of a quantum point contact (QPC) performed in the framework of the density functional theory (DFT) in the local spin-density approximation (LDA). We show that a spin-degeneracy of the conductance channels is lifted and the total conductance exhibits a broad plateau-like feature at 0.5*2e^{2}/h. The lifting of the spin-degeneracy is a generic feature of all studied QPC structures (both very short and very long ones; with the lengths in the range 40

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