Scenario for the 0.7-conductance anomaly in quantum point contacts
2003 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, Vol. 67, no 23Article in journal (Refereed) Published
Effects of spontaneous spin polarization in quantum point contacts (QPC's) are investigated for a realistic semiconductor device structure using the Kohn-Sham local spin-density formalism. At maximal polarization in the contact area, there is a bifurcation into ground-state and metastable solutions. The conduction associated with the metastability is lower than for the normal state. With increasing temperature, the conductance should therefore show an anomalous behavior as observed. For the present device we do not recover resonance or quasibound states.
Place, publisher, year, edition, pages
2003. Vol. 67, no 23
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-47775DOI: 10.1103/PhysRevB.67.235319OAI: oai:DiVA.org:liu-47775DiVA: diva2:268671