Anomalous Fano Profiles in External Fields
Alejandro Zielinski1, Vinay Pramod Majety1, Stefan Nagele2
1Physics Department, Ludwig Maximilians Universität, D-80333 Munich, Germany.
Abstract:
We show that the external control of Fano resonances in general leads to complex Fano q parameters. Fano line shapes of photoelectron and transient absorption spectra in the presence of an infrared control field are investigated. Computed transient absorption spectra are compared with a model proposed for a recent experiment [C. Ott et al., Science 340, 716 (2013)]. Control mechanisms for photoelectron spectra are exposed: control pulses applied during excitation modify the line shapes by momentum boosts of the continuum electrons. Pulses arriving after excitation generate interference fringes due to infrared two-photon transitions.
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