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MO: Fachverband Molekülphysik

MO 11: Theoretical Approaches

MO 11.6: Vortrag

Dienstag, 6. März 2018, 15:15–15:30, PA 1.150

Phase control of a complex Fano resonance — •Nicola Mayer, Misha Ivanov, and Oleg Kornilov — Max Born Institut, Max-Born-Straße 2A, 12489 Berlin, Germany

A complex Fano resonance is a generic quantum mechanical system consisting of two or more autoionizing states coupled to a common continuum. This system may exhibit a counterintuitive quantum effect: an increase of the lifetime of one of these states for increasing strength of coupling to the continuum. Commonly known as interference stabilization, the effect was first proposed for laser-dressed Rydberg states [1]. In our previous work we showed that the effect takes place in the autoionization of a complex resonance in N2 [2,3]. Here, we explore possibility of controlling such autoionization dynamics by changing the relative phase of two discrete states via laser-induced couplings to a third one. In particular, we show how, by inducing a phase shift of the coherent wavepacket of the two discrete states, one can control the resulting interference and selectively excite the long- or short-lived components of a complex resonance. We present theoretical calculations for transient absorption and photoelectron signals for this model system.

Reference:

[1] M.V. Fedorov, Atomic and free electrons in a strong light field. Word Scientific, 1998. [2] M. Eckstein, N. Mayer et al., Faraday Discuss., DOI: 10.1039/C6FD00093B, 2016. [3] M. Eckstein,, et al., Phys. Rev. Lett., 116, 153003, 2016.