k-resolved susceptibility function of 2H-TaSe2 from angle-resolved photoemission

J. Laverock, D. Jr. Newby, E. Abreu, R. Averitt, K. E. Smith, R. P. Singh, G. Balakrishnan, Johan Adell, Balasubramanian Thiagarajan

Research output: Contribution to journalArticlepeer-review

Abstract

The connection between the Fermi surface and charge-density-wave (CDW) order is revisited in 2H-TaSe2. Using angle-resolved photoemission spectroscopy, ab initio band-structure calculations, and an accurate tight-binding model, we develop the empirical k-resolved susceptibility function, which we use to highlight states that contribute to the susceptibility for a particular q vector. We show that although the Fermi surface is involved in the peaks in the susceptibility associated with CDW order, it is not through conventional Fermi surface nesting, but rather through finite energy transitions from states located far from the Fermi level. Comparison with monolayer TaSe2 illustrates the different mechanisms that are involved in the absence of bilayer splitting.
Original languageEnglish
Article number035108
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume88
Issue number3
DOIs
Publication statusPublished - 2013

Subject classification (UKÄ)

  • Natural Sciences
  • Physical Sciences

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