Effects of short-range interactions on transport through quantum point contacts: A numerical approach

Details Effects of short-range interactions on transport through quantum point contacts: A numerical approach Effects of short-range interactions on transport through quantum point contacts: A numerical approach

2006-11-17

arxiv.org/abs/cond-mat/0611464v1

Phys. Rev. B v75, 045346 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 10 figures

Scientific paper

10.1103/PhysRevB.75.045346

We study electronic transport through a quantum point contact, where the interaction between the electrons is approximated by a contact potential. Our numerical approach is based on the non-equilibrium Green function technique which is evaluated at Hartree-Fock level. We show that this approach allows us to reproduce relevant features of the so-called "0.7 anomaly" observed in the conductance at low temperatures, including the characteristic features in recent shot noise measurements. This is consistent with a spin-splitting interpretation of the process, and indicates that the "0.7 anomaly" should also be observable in transport experiments with ultracold fermionic atoms.

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