Mainz 2017 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

A: Fachverband Atomphysik

A 22: Attosecond Science

A 22.1: Invited Talk

Wednesday, March 8, 2017, 14:30–15:00, N 2

Electron correlation dynamics in weak and strong fields — •Christian Ott — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

This talk gives an overview of recent progress in the experimental investigation of correlated electron dynamics by means of all-optical absorption spectroscopy. Turning to the most fundamental system to investigate such processes, the helium atom with two active electrons, asymmetric Fano absorption line shapes are identified as a direct view into the multi-channel interaction of different two-electron configurations [1]. In response to few-cycle near-infrared laser fields of tunable strength, these channels can be selectively altered, which can be measured and understood as a change in the absorption profile [2]. This concept also enables the controlled steering of a two-electron wave packet [3], where the correlated position of both electrons with respect to the helium core can be reconstructed from theoretical calculation of the corresponding two-electron states. A new approach to correlated electron dynamics in solids is then gained with the discussion of recent experimental results on the ultrafast electronic phase transition in vanadium dioxide [4], which is investigated via attosecond transient absorption spectroscopy.

[1] U. Fano, Phys. Rev. 124, 1866 (1961).

[2] C. Ott et al., Science 340, 716 (2013).

[3] C. Ott et al., Nature 516, 374 (2014).

[4] M. F. Jager et al., manuscript in preparation (2016).