Time-domain evidence for an excitonic insulator
1 Institute of Experimental and Applied Physics, University of Kiel, D-24098 Kiel, Germany
2 JILA and Department of Physics, University of Colorado and NIST, Boulder, Colorado, 80309-0440, USA
Time- and angle-resolved photoemission spectroscopy with a high–harmonic- generation source is used to classify the potential excitonic insulator 1T-TiSe2 and the reference Peierls-Mott insulator 1T-TaS2 on the basis of the melting times of “spectroscopic order parameters”.
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