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Remnant Fermi surface in the presence of an underlying instability in layered 1T-TaS_2

Th. Pillo·J. Hayoz·H. Berger·M. Grioni·L. Schlapbach·P. Aebi
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Abstract

We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T-TaS_2 in the quasi commensurate (QC) and the commensurate (C) charge-density-wave (CDW) phase. Instead of a nesting induced partially removed FS in the CDW phase we find a pseudogap over large portions of the FS. This remnant FS exhibits the symmetry of the one-particle normal state FS even when passing from the QC-phase to the C-phase. Possibly, this Mott localization induced transition represents the underlying instability responsible for the pseudogapped FS.

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Th. Pillo, J. Hayoz, H. Berger, M. Grioni, L. Schlapbach, P. Aebi. 1999-02-24. Remnant Fermi surface in the presence of an underlying instability in layered 1T-TaS_2. https://doi.org/10.1103/physrevlett.83.3494

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