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Symmetries are a fundamental constituent of condensed matter physics. We have developed an ultrafast optical method to detect broken time-reversal symmetry, i.e. differences of the electronic structure between +k and -k in the Brillouin zone. Our theory reveals the mechanism of time-reversal-symmetry breaking and its detection!
The experiments leading to these results were carried out in the group of Giancarlo Soavi (University of Jena) and the work appeared in Nature Photonics.