Regensburg 2007 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 8: Invited Talk Fischer
HL 8.1: Hauptvortrag
Montag, 26. März 2007, 14:00–14:45, H15
Coupling phenomena in dual electron waveguide structures — •Saskia Fischer1, Sven Bucholz1, Gabriela Aptetrii1, Ulrich Kunze1, Dieter Schuh2, and Gerhard Abstreiter3 — 1Werkstoffe und Nanoelektronik, Ruhr-Univ. Bochum, D-44789 Bochum — 2Ang. und Experimentelle Physik, Univ. Regensburg, D-93040 Regensburg — 3Walter-Schottky Institut,Technische Univ. München, D-85748 München
A review is given on coupling phenomena between two one-dimensional electron systems (1DES) in dual electron waveguide structures realized as quantum point contacts or short quantum wires. Dual 1DES can be prepared from GaAs/AlGaAs heterostructures hosting high-mobility two-dimensional electron gases. Today, the merits of nanolithography allow a standard fabrication of 1DES with subband spacings of more than 10 meV. Therefore, high-resolution transport and magnetotransport spectroscopy can be performed which reveals directly the 1D subband structure of each quantum conductor and the energy splittings of mode-coupled levels [1]. Operation at liquid helium temperature and above is demonstrated. Mode coupling between degenerate 1D subbands depends on the symmetry of the confining potential and the coupling strength. Examples will be discussed for spatially coincident and tunnel-coupled vertically stacked dual 1DES [2,3]. [1] S.F. Fischer, et al., Nature Physics 2, 91-96 (2006). [2] S.F. Fischer, et al., Phys. Rev. B 71, 195330 (2005). [3] S.F. Fischer, et al., Phys.Rev. B 74, 115324 (2006).