Scattering of chiral currents by quantum point contacts

Author

Cresti, A. ; Grosso, G. ; Parravicini, G.P.

Author_Institution

Dipt. di Fisica, Pisa Univ., Italy

fYear

2004

fDate

16-19 Aug. 2004

Firstpage

491

Lastpage

494

Abstract

The conductive channels and the current distributions through a narrow quantum point contact (QPC) in a two-dimensional electron gas threaded by a uniform magnetic field are studied using the Keldysh nonequilibrium Green´s function formalism and a site representation of the electron Hamiltonian. We show that when the conditions of chiral transport regime are met in the two regions separated by the QPC, exact quantization in integer multiples of 2e²/h is maintained both for the conductance of the incident current and the backscattered plus transmitted currents.

Keywords

Green´s function methods; chirality; electric admittance; electronic density of states; nanoelectronics; quantum interference devices; quantum point contacts; two-dimensional electron gas; Keldysh nonequilibrium Green´s function formalism; backscattered currents; chiral current scattering; chiral transport regime; conductive channels; current distributions; electron Hamiltonian; electronic density of states; narrow quantum point contacts; quantization; transmitted currents; two-dimensional electron gas; uniform magnetic field; Chemicals; Electrons; Green´s function methods; Lattices; Magnetic fields; Magnetic flux; Microscopy; Particle scattering; Quantization; Reservoirs;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology, 2004. 4th IEEE Conference on

Print_ISBN

0-7803-8536-5

Type

conf

DOI

10.1109/NANO.2004.1392396

Filename

1392396