Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Photoionization
A 13.2: Vortrag
Dienstag, 13. März 2012, 10:45–11:00, V55.01
Anderson-like localization effects in electromagnetically driven helium — •Felix Jörder1, Klaus Zimmermann1, Vera Neimanns1, Alberto Rodriguez1, Pierre Lugan2, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg i.Br., Deutschland — 2EPFL, Lausanne, Schweiz
The driven helium atom defines a paradigmatic scenario of a fragmenting quantum system, characterized by high spectral densities and decay channels into multiple continua. A powerful tool to access the spectral structure underlying the field-induced excitation and fragmentation process is provided by complex dilation of the Hamiltonian, which uncovers the pole structure of the resolvent operator and provides insight into the dynamics of the system. The microwave-induced excitation process of helium Rydberg atoms is retarded by Anderson-like (dynamical) localization effects, leading to strongly reduced multiphoton decay rates. We present numerical simulations of this process and study the impact of the interelectronic Coulomb repulsion on the localization behavior.