Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-03-25
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 Pages, 9 Figures, submitted to PRB
Scientific paper
10.1103/PhysRevB.78.125423
The electron and current density distributions in the close proximity of quantum point contacts (QPCs) are investigated. A three dimensional Poisson equation is solved self-consistently to obtain the electron density and potential profile in the absence of an external magnetic field for gate and etching defined devices. We observe the surface charges and their apparent effect on the confinement potential, when considering the (deeply) etched QPCs. In the presence of an external magnetic field, we investigate the formation of the incompressible strips and their influence on the current distribution both in the linear response and out of linear response regime. A spatial asymmetry of the current carrying incompressible strips, induced by the large source drain voltages, is reported for such devices in the non-linear regime.
Aktas Saban
Arslan S.
Cicek E.
Eksi D.
Siddiki Afif
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