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Subjects played either a standard two-person Prisoner's Dilemma game or an equivalent three-person version. Despite the fact that an economic model would predict equal rates of cooperation, triads were substantially less cooperative. The transition matrices indicated that it was more difficult in the threeperson setting to establish a pattern of cooperation that could be subsequently maintained.

Recent progress in laser-based high-repetition rate extreme ultraviolet (EUV) lightsources and multidimensional photoelectron spectroscopy enable the build-up of a new generation of time-resolved photoemission experiments. Here, we present a setup for time-resolved momentum microscopy driven by a 1 MHz femtosecond EUV table-top light source optimized for the generation of 26.5 eV photons. The setup provides simultaneous access to the temporal evolution of the photoelectron´s kinetic energy and in-plane momentum. We discuss opportunities and limitations of our new experiment based on a series of static and time-resolved measurements on graphene.

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