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SYNF: Symposium Ferroic materials and novel functionalities
SYNF 2: Ferroic materials and novel functionalities II
SYNF 2.1: Hauptvortrag
Dienstag, 26. Februar 2008, 14:30–15:00, A 151
Tunable two-dimensional electron gases in correlated electronic systems — •J. Mannhart1, G. Hammerl1, T. Kopp1, C. Richter1, C.W. Schneider1, S. Thiel1, N. Reyren2, A.D. Caviglia2, S. Gariglio2, D. Jaccard2, J.-M. Triscone2, L. Fitting-Kourkoutis3, D. Muller3, C. Cheng4, and J. Levy4 — 1Center for Electronic Correlations and Magnetism, Augsburg University, Germany — 2University of Geneva, Switzerland — 3Cornell University, USA — 4University of Pittsburgh, USA
The unique properties of two-dimensional electron gases in semiconductor heterostructures provide the basis for a variety of high-performance devices, such as high electron mobility transistors or quantum well lasers, and for fundamental phenomena, such as the integer and fractional quantum Hall effects. Because standard semiconductors are mean-field systems it is intriguing that recent progress in heterostructure growth of oxides offers now the possibility to fabricate two-dimensional gases of materials with interacting electrons. These electronic correlations shape the properties of the electron gas, which, for example, may develop a ferromagnetic or a superconducting ground state. In field-effect transistor configurations these electron gases can be tuned [1], so that for example switchable, transparent superconductors are obtained [2]. In the presentation I will provide an overview of our experiments with such electron systems.
[1] S. Thiel et al., Science 313, 1942 (2006)
[2] N. Reyren et al., Science 317, 1196 (2007)