Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.22: Poster

Wednesday, March 13, 2013, 16:00–20:00, Poster A

Magneto thermopower measurements on rolled-up 2DESs — •Nils Gayer, Matthias Schmidt, Gunnar Schneider, David Sonnenberg, and Wolfgang Hansen — Institut für Angewandte Physik, Universität Hamburg

We present magneto thermopower and magnetotransport measurements on an evenly curved two-dimensional electron gas (2DEG). The 2DEG is confined in a rolled-up GaAs/AlGaAs high electron mobility heterostructure (HEMT) grown by molecular beam epitaxy. In a rolled-up 2DEG the perpendicular magnetic field component is sinusoidally modulated and the density of states changes along the roll. This arises because in a magnetic field the 2D electronic density of states condensates on the Landau levels (LL) and the filling of the LL depends on the strength of the magnetic field component perpendicular to the 2DEG. We rotate the rolled up structure in the magnetic field and show the dependence of the diagonal and the off-diagonal (Nernst-Ettingshausen) magneto thermopower on the rotation angle.