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Emergence of a Fermi-surface in the current-driven Hidden state of 1T-TaS2

Date : Friday, December 6th, 2024 3:00 pm 〜 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Prof. Amit Kanigel Affiliation : Technion-Israel Institute of Technology Committee Chair : Takeshi Kondo
e-mail: kondo1215@issp.u-tokyo.ac.jp
Language in Speech : English

We investigate the nature of the metallic metastable state in 1T-TaS2. Using micro-ARPES, we measure the spatially-dependent modifications of the electronic structure of the sample following a short current pulse. We observe that, in some regions of the sample, a Fermi surface emerges, while other regions remain gapped. A detailed study of the band structure in these different regions suggests that the metallic parts are in a state similar to the nearly commensurate charge density wave (NC-CDW) state, where the gaps are suppressed and a band crosses the Fermi level. Furthermore, we find that the metallic and insulating regions of the sample exhibit different dispersions normal to the planes. This observation is consistent with a scenario in which the current pulse breaks the star-of-David dimers present in the commensurate charge density wave (C-CDW) state.


(Published on: Wednesday November 27th, 2024)