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Current imaging in quantum point contacts

✍ Scribed by Cresti, Alessandro

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
515 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The experimental imaging of microscopic currents in two‐dimensional electron gas based systems has been recently realized exploiting an ingenious use of scanning microscope tips. By means of the Keldysh Green's function formalism in a tight‐binding framework, I study the electron transport in a model quantum point contact device, obtaining detailed maps of the local current distribution. The results are then compared with those obtained by a direct simulation of the experimental process, i.e. introducing a suitable external potential to reproduce the effect of the coupled microscopic tip on the overall conductance and the electron flow. The analysis of the differences between the two calculations helps to interpret the experimental maps and sheds light on the interference effects of the tip. (Β© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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