Vortrag: Quantum Atom Optics: From matter-wave interferometry to "nuclear clocks", 16.06.200, 15:00 Uhr

16 Jun 2009 by in Studium

Im Rahmen des Berufungsverfahrens für die Professur aus Angewandter Quantenphysik hält Thorsten Schumm vom Atominstitut der österreichischen Universitäten, Wien einen Vortrag zum Thema "Quantum Atom Optics: From matter-waves interferometry to "nuclear clocks".

Der Vortrag findet am Dienstag, 16.06.2009 um 15:00 Uhr im Hörsaal des Atominstituts der österreichischen Universitäten (Stadionalle 2, 1020 Wien) statt.


Optical interferometry with lasers is one of the most powerful implementations of quantum
technology with applications ranging from fundamental research to industry devices. Quantum-
degenerate Bose gases can be described as a collective macroscopic wave function, in strong
analogy to the coherent light field emitted by a laser, and are hence a suitable source for matter-
wave interferometry. However, in contrast to photons, matter-waves show non-linear particle-
particle interactions which lead to new interesting effects, quantum phases and regimes.
I will review our efforts to implement atom-optical elements for matter-waves in confined
geometries, focusing on a new beam-splitter scheme which enables coherent interferometry with
Bose-Einstein condensates [1]. I will also discuss yet missing atom-optical elements and future
research directions.
Atomic physics and nuclear physics are essentially separated research fields. Although the
theoretical models for the electron shell and the nucleus show strong resemblance, the involved
energy scales differ by many orders of magnitudes. The radioisotope 229-Thorium is the only
known isotope with the possibility to manipulate a nuclear transition with optical frequencies. This
is due to an unnaturally low-energy isomeric state with a transition energy of 7.6 ± 0.5 eV (which
corresponds to an optical range of 200 nm to 130 nm in vacuum UV) and an expected lifetime of 5
h [2]. Due to the extremely narrow line width and strong shielding by the electron shell, the nuclear
transition is a prime candidate for a “nuclear clock” time standard based on a solid-state UV
transparent crystal [3].
I propose to perform optical UV spectroscopy on the radioisotope 229-Thorium, which is available
at the ATI, to identify the transition energy and hence render a nuclear transition accessible to
manipulation on the quantum level.
[1] T. Schumm, S. Hofferberth, L. M. Andersson et.al., Nature Physics 1, 57-62 (2005)
[2] B. R. Beck, J. A. Becker, P. Beiersdorfer et.al., Phys. Rev. Lett. 98, 142501 (2007)
[3] E. Peik, Chr. Tamm, Europhysics Letters 61, 181 (2003)

Ein Zusammenfassung findet sich auch auf der Webseite des Instituts unter http://www.ati.ac.at/fileadmin/files/general/Vortraege/BerufungsvortragAngewQuantenphysik_Schumm.pdf .


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Topic revision: r2 - 16 Jun 2009, waliddPHYSIKFHTUFAT

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