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A: Atomphysik
A 17: Atome in äusseren Feldern
A 17.4: Talk
Thursday, March 7, 2002, 17:15–17:30, HS 01/EZ04
Fractal fluctuations and algebraic decay in driven Rydberg states — •Sandro Marcel Wimberger1,2, Italo Guarneri2, and Andreas Buchleitner1 — 1Nonlinear Dynamics in Quantum Systems, Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, D-01187 Dresden — 2International Centre for the Study of Dynamical Systems, Università degli Studi dell’ Insubria , Via Valleggio 11, I-22100 Como
We report an algebraic decay of ionization-widths distributions of hydrogen Rydberg states, periodically driven by a monochromatic microwave. Two different mechanisms leading to the universal decay exponent one are established: Dynamical localization and localization of states in the integrable region of classical phase space. Our results not only confirm the close analogy between atomic transport and conductance in Anderson-localized solids [1], but they also pin down the statistical properties of resonance poles responsible for fractal fluctuations and their connection to distributions of decay rates or ionization widths, respectively.
[1]S. Wimberger, A. Buchleitner, J. Phys. A 34, 7181-7193 (2001)