Berlin 2008 – scientific programme

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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 2: Ferroic materials and novel functionalities II

SYNF 2.1: Invited Talk

Tuesday, February 26, 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)