Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Quantum dots and wires: Transport properties II

HL 24.7: Vortrag

Dienstag, 27. März 2007, 15:45–16:00, H15

Simulation of quantum transport in semiconductor nanocolumns with non-uniform lateral confinement — •Katharina Peter, Klaus Michael Indlekofer, Jakob Wensorra, Mihail Ion Lepsa, Hans Lüth, and Detlev Grützmacher — Center of Nanoelectronic Systems for Information Technology (IBN-1), Forschungszentrum Jülich GmbH, D-52425 Jülich

Semiconductor nanocolumns have attracted great interest due to their unique transport properties.

We present a numerical simulation of electronic transport in semiconductor nanocolumns based on a Green's function approach. With this simulation we investigate the effects of the presence of a saddle-point in the potential caused by doping and Fermi-level pinning [1]. Due to this confining potential, mixing of the lateral modes can occur which gives rise to additional fine structures in the current-voltage characteristics.

Assuming cylindrical symmetry of the column we expand the lateral wave function in a basis of Bessel functions to calculate the non-equilibrium Green's functions, which provide the electron density and the current in the nanocolumn.

[1]K. M. Indlekofer, M. Goryll, J. Wensorra, M. I. Lepsa, cond-mat/0609057, submitted (2006)