Electron-electron interaction effects in quantum point contacts

Lunde, Anders Mathias; De Martino, Alessandro; Egger, Reinhold; Flensberg, Karsten

Electron-electron interaction effects in quantum point contacts

Authors

Lunde, Anders Mathias

De Martino, Alessandro

Egger, Reinhold

Flensberg, Karsten

Description

We consider interaction effects in quantum point contacts on the first quantization plateau, taking into account all non momentum-conserving processes. We compute low-temperature linear and non-linear conductance, shot noise, and thermopower by perturbation theory, and show that they are consistent with experimental observations on the so-called "0.7 anomaly". The full temperature-dependent conductance is obtained from self-consistent second-order perturbation theory and approaches ~ e^2/h at higher temperatures, but still smaller than the Fermi temperature.
4 pages