Conference »Quantum Physics of Nature« (QUPON 2005) Mitschnitt einer Veranstaltung der Fakultät für Physik der Universität Wien am Montag, dem 23. Mai 2005 im Großen Festsaal der Universität Wien Teil 18: Akira Tonomura: Quantum phenomena observed using electrons Abstract: Quantum mechanics, which was first born as a law describing the behavior of electrons inside atoms, now provides the basis for nearly all physical theories. Although there still remained unsettled problems at its very foundation, recent technological developments have made it possible to experimentally examine some of these problems. Quantum phenomena are now attracting attention not only in scientific fields but also in fields seeking practical applications to electronic devices as obstacles to the further improvement of device performances and as pathfinders for future devices. We have successively developed brighter field-emission electron beams over 30 years and used them to directly observe quantum phenomena by using the wave nature of electrons. Every time we developed a brighter electron beam, new applications opened up. We can now carry out fundamental experiments in quantum mechanics that were once regarded as thought experiments. Examples include a single-electron build-up of an interference pattern and conclusive experiments on the Aharonov-Bohm effect. In addition, visualizing magnetic lines of force in h/e flux units by interference microscopy and dynamically observing quantized vortices in superconductors by Lorentz microscopy have become possible. These methods are expected to become useful tools for investigating quantum phenomena that have begun to appear at many places in microscopic regions including electronic devices. Akira Tonomura ist Physiker bei der Hitachi Ltd. Corporation. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Introduction 00:00:09 3. Development of bright electron beams 00:05:49 4. Aharonov-Bohm effect 00:08:30 5. Vortices in superconductors 00:15:41 6. Holography electron microscope 00:18:24

Elektronenstrahl, Aharonov-Bohm-Effekt, Elektronenmikroskopie

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