0.4 and 0.7 conductance anomalies in quantum point contacts

Details 0.4 and 0.7 conductance anomalies in quantum point contacts 0.4 and 0.7 conductance anomalies in quantum point contacts

2007-03-13

arxiv.org/abs/cond-mat/0703323v2

Nanotechnology 18 (2007) 185403

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, to appear in Nanotechnology

Scientific paper

10.1088/0957-4484/18/18/185403

Self-consistent modelling based on local spin-density formalism is employed to calculate conductance of quantum point contacts at finite temperatures. The total electrostatic potential exhibits spin-dependent splitting, which persists at temperatures up to 0.5 K and gives rise to the anomalies at 0.4 and 0.7 of the conductance quantum $2e^2/h$ occurring simultaneously in the absence of external magnetic fields.

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