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Open Access Publications from the University of California

What makes the Tcof monolayer FeSe on SrTiO3so high: a sign-problem-free quantum Monte Carlo study

  • Author(s): Li, ZX
  • Wang, F
  • Yao, H
  • Lee, DH
  • et al.

© 2016, Science China Press and Springer-Verlag Berlin Heidelberg. Monolayer FeSe films grown on SrTiO3(STO) substrate show superconducting gap-opening temperatures (Tc) which are almost an order of magnitude higher than those of the bulk FeSe and are highest among all known Fe-based superconductors. Angle-resolved photoemission spectroscopy observed “replica bands” suggesting the importance of the interaction between FeSe electrons and STO phonons. These facts rejuvenated the quest for Tcenhancement mechanisms in iron-based, especially iron-chalcogenide, superconductors. Here, we perform the first numerically-exact sign-problem-free quantum Monte Carlo simulations to iron-based superconductors. We (1) study the electronic pairing mechanism intrinsic to heavily electron doped FeSe films, and (2) examine the effects of electron–phonon interaction between FeSe and STO as well as nematic fluctuations on Tc. Armed with these results, we return to the question “what makes the Tcof monolayer FeSe on SrTiO3so high?” in the conclusion and discussions.

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