From mesoscopic magnetism to the anomalous 0.7 conductance plateau

2000/02/22 by Henrik Bruus, Vadim Cheianov, Vadim V. Cheianov +4
Engineering · Physics and Astronomy · #Mechanical and Optical Resonators #Molecular Junctions and Nanostructures #Quantum and electron transport phenomena #cond-mat.mes-hall

paper · pdf · doi:10.48550/arxiv.cond-mat/0002338

4 pages RevTex, with 4 ps figures

arxiv created 2000/02/22 · arxiv updated 2009/11/30

Abstract

We present a simple phenomenological model which offers a unifying interpretation of the experimental observations on the 0.7 conductance anomaly of quantum point contacts. The model utilizes the Landauer-Buttiker formalism and involves enhanced spin correlations and thermal depopulation of spin subbands. In particular our model can account for the plateau value 0.7 and the unusual temperature and magnetic field dependence. Furthermore it predicts an anomalous suppression of shot noise at the 0.7 plateau.

Related

• "0.7 anomaly" and magnetic impurity formation in quantum point contacts
• Electron-electron interaction effects in quantum point contacts
• Conductance Anomaly in a Partially Open Adiabatic Quantum Point Contact
• The 0.7 anomaly in quantum point contact; many-body or single-electron\n effect?
• Quantum Point Contacts and Beyond: New Results on Mesoscopic Conductance and Fluctuations