Origin of the 0.25-anomaly in the nonlinear conductance of a quantum point contact

Details Origin of the 0.25-anomaly in the nonlinear conductance of a quantum point contact Origin of the 0.25-anomaly in the nonlinear conductance of a quantum point contact

2009-01-22

arxiv.org/abs/0901.3573v1

Phys. Rev. B 79, 235313 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

We calculate the non-linear conductance of a quantum point contact using the non-equilibrium Greens function technique within the Hartree approximation of spinless electrons. We quantitative reproduce the 0.25-anomaly in the differential conductance (i.e. the lowest plateau at 0.25-0.3*2e^2/h) as well as an upward bending of higher conductance half-integer plateaus seen in the experiments, and relate these features to the non-linear screening and pinning effects.

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