Accessing and probing of the photo-induced hidden state in 1T-TaS2 with time- and angle-resolved photoemission spectroscopy

Isabella Avigo; Igor Vaskivskyi; Manuel Ligges; Matthias Kalläne; Kai Rossnagel; Ljupka Stojchevska; Dragan Mihailović; Uwe Bovensiepen

doi:10.1117/12.2239258

26 September 2016 Accessing and probing of the photo-induced hidden state in 1T-TaS₂ with time- and angle-resolved photoemission spectroscopy

Isabella Avigo, Igor Vaskivskyi, Manuel Ligges, Matthias Kalläne, Kai Rossnagel, Ljupka Stojchevska, Dragan Mihailović, Uwe Bovensiepen

Author Affiliations +

Proceedings Volume 9931, Spintronics IX; 99313V (2016) https://doi.org/10.1117/12.2239258
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

A previous time-resolved optical study reported on a metastable hidden electronic state in 1T-TaS2, which is only accessible upon photoexcitation and created under non-equilibrium conditions [1]. The properties of such a state are distinct from those of any other state in the equilibrium phase diagram and it is possible to revert to the thermodynamic initial state either by illuminating with picosecond laser pulses or by applying other thermal erase procedures. In this work we show photoinduced switching to a metastable hidden state on the same material, and probe it by means of both static and time-resolved photoemission spectroscopy, thus having direct access to the electronic structure of the system. From our experimental findings and comparison with other studies, we conclude that we obtain partial switching, leading to a hidden state with persisting insulating nature but significant modifications in the electronic structure and CDW ordering.

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Isabella Avigo, Igor Vaskivskyi, Manuel Ligges, Matthias Kalläne, Kai Rossnagel, Ljupka Stojchevska, Dragan Mihailović, and Uwe Bovensiepen "Accessing and probing of the photo-induced hidden state in 1T-TaS₂ with time- and angle-resolved photoemission spectroscopy", Proc. SPIE 9931, Spintronics IX, 99313V (26 September 2016); https://doi.org/10.1117/12.2239258

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