Mannhart’s research includes the fabrication of novel all-oxide field-effect transistors, in which phase changes can be switched at interface layers, including phase changes to superconductivity. Under his leadership, his research group has developed an improved scanning probe microscope, which features a resolution of 77 picometers. With this instrument, his group succeeded in imaging individual atoms with subatomic resolution, which was used, for example, to investigate the atomic mechanism of friction. With P. Chaudhari and D. Dimos, J. Mannhart revealed that grain alignment is key to the fabrication of high-temperature superconductors with useful critical currents, so that they are suitable for practical applications such as modern high-Tc superconducting cables. Another research area is thermoelectronic generators.
Key Publications
Li, L., C. Richter, S. Paetel, T. Kopp, J. Mannhart, and R.C. Ashoori: Very large capacitance enhancement in a two-dimensional electron system. Science 332, 825-828
Mannhart, J., and D.G. Schlom: Oxide interfaces — An opportunity for electronics. Science 327, 1607-1611
Cen, C., S. Thiel, J. Mannhart, and J. Levy: Oxide nanoelectronics on demand. Science 323, 1026-1030
Loder, F., A.P. Kampf, T. Kopp, J. Mannhart, C.W. Schneider, and Y.S. Barash: Magnetic flux periodicity of h/e in superconducting loops. Nature Physics 4, 112-115
Reyren, N., S. Thiel, A.D. Caviglia, L. Fitting Kourkoutis, G. Hammerl, C. Richter, C.W. Schneider, T. Kopp, A.-S. Ruetschi, D. Jaccard, M. Gabay, D.A. Muller, J.-M. Triscone, and J. Mannhart: Superconducting interfaces between insulating oxides. Science 317, 1196-1199
Thiel, S., G. Hammerl, A. Schmehl, C.W. Schneider, and J. Mannhart: Tunable quasi-two-dimensional electron gases in oxide heterostructures. Science 313, 1942-1945
Herz, M., FJ. Giessibl, and J. Mannhart: Probing the shape of atoms in real space.Physical Review B 68, 045301
Giessibl, FJ., M. Herz, and J. Mannhart: Friction traced to the single atom. PNAS 99, 12006-12010
Giessibl, FJ., S. Hembacher, H. Bielefeldt al.: Subatomic features on the silicon - surface observed by atomic force microscopy. Science 289, 422-425
Dimos, D., P. Chaudhari, J. Mannhart, et al.: Orientation dependence of grain-boundary critical currents in YBa2Cu3O7-δ Bicrystals.Physical Review Letters 61, 219-222
Mannhart, J., J. Bosch, R. Gross, et al.: Two-dimensional imaging of trapped magnetic-flux quanta in Josephson tunnel-junctions. Physical Review B 35, 5267-5269
