Osterwalder Dil
Fakultäten » Mathematisch-naturwissenschaftliche Fakultät » Physik-Institut » Festkörperpysik » Prof. Dr. Juerg Osterwalder » Osterwalder Dil
Completed research project
| Title / Titel | Spintronics: Spin Structures on Surfaces | ||||
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| Abstract (PDF, 14 KB) | |||||
| Summary / Zusammenfassung | The rapidly growing field of spintronics introduces functionalities in electronic devices that are based on the electron spin. Doing so requires knowledge and control of spin structures in real space and/or in reciprocal space. In the spin field effect transistor invented by Datta and Das, for example, ferromagnetic source and drain electrodes represent simple real-space spin structures, whereas the momentum dependence of the spin in the active channel is necessary for the control of the spin precession by the electric field of the gate electrode. This momentum dependence is due to the spin-orbit effect that can arise for a two-dimensional electron gas (2DEG) in an asymmetric confining potential and is called the Rashba effect. Recently, it was recognized that the Shockley surface states on the (111) surfaces of noble metals are paradigmatic realizations of spin-orbit split electronic states. On Au(111), the spin-orbit coupling is strong enough to allow the splitting to be detected even in spin-integrated photoemission. Using a novel spin-resolving photoemission experiment (COPHEE) designed and built by our group and operating now at the Swiss Light Source, we could measure the spin structure of this surface state, with rotating spins along the circular Fermi surface. These studies are currently extended to other heavy element surfaces, and to nanostructured surfaces and ultrathin films. Weitere Informationen |
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| Publications / Publikationen | Spin-polarized Fermi surface mapping, M. Hoesch, T. Greber, V. N. Petrov, M. Muntwiler, M. Hengsberger, W. Auwärter, J. Osterwalder, J. Electron Spectrosc. Relat. Phenom. 124, 263-279 (2002).Spin- and angle-resolved photoemission spectroscopy study of the Au(111) Shockley surface state, M. Muntwiler, M. Hoesch, V. N. Petrov, M. Hengsberger, L. Patthey, M. Shi, M. Falub, T. Greber, J. Osterwalder, J. Electron Spectrosc. Relat. Phenom. 137-140, 119-123 (2004).Spin structure of the Shockley surface state on Au(111) M. Hoesch, M. Muntwiler, V. N. Petrov, M. Hengsberger, L. Patthey, M. Shi, M. Falub, T. Greber, J. Osterwalder, Phys. Rev. B 69, 241401(R)-1-4 (2004).Weitere Informationen |
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| Keywords / Suchbegriffe | spintronics, photoelectron spectroscopy, spin polarization, Fermi surface, synchrotron radiation,, electronic structure, surface states, nanostructures, surface magnetism, | ||||
| Project leadership and contacts / Projektleitung und Kontakte |
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| Other links to external web pages | http://sls.web.psi.ch/view.php/beamlines/sis/research/index.html | ||||
| Funding source(s) / Unterstützt durch |
Universität Zürich (position pursuing an academic career), SNF (Personen- und Projektförderung), Other Public Sources (e.g. Federal or Cantonal Agencies) (PSI) |
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| Duration of Project / Projektdauer | Jan 1997 to Mar 2011 |