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Paper

Time-resolved photoemission beyond the energy-time uncertainty

MPS-Authors

Randi, Francesco
Department of Physics, Università degli Studi di Trieste, 34127 Trieste, Italy;
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Eckstein, Martin
Theory of Correlated Systems out of Equilibrium, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
University of Hamburg-CFEL, 22761 Hamburg, Germany;

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Citation

Randi, F., Fausti, D., & Eckstein, M. (in preparation). Time-resolved photoemission beyond the energy-time uncertainty.

Abstract

Emergent properties of solids, such as long range order or quasiparticle states, often become manifest on small energy scales in the electronic spectrum. The time-frequency uncertainty therefore puts an intrinsic limit on how accurately their nonequilibrium properties can be studied with standard time-resolved photoemission experiments, although the real dynamics of the system can be much faster than this spectral uncertainty limit. Here we theoretically demonstrate that dynamical information on all timescales can nevertheless be retrieved from photoemission experiments, using suitably shaped light pulses of quantum or classical nature. This may provide a route to use arbitrarily short pulses to probe the dynamics of low energy degrees of freedom in solids. As a particular example, we analyze the real-time buildup of a Kondo resonance.