How Correlated is the FeSe/SrTiO3 System?

Subhasish Mandal, Peng Zhang, Sohrab Ismail-Beigi, and K. Haule
Phys. Rev. Lett. 119, 067004 – Published 8 August 2017
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Abstract

Recent observation of 10 times higher critical temperature in a FeSe monolayer compared with its bulk phase has drawn a great deal of attention because the electronic structure in the monolayer phase appears to be different than bulk FeSe. Using a combination of density functional theory and dynamical mean field theory, we find electronic correlations have important effects on the predicted atomic-scale geometry and the electronic structure of the monolayer FeSe on SrTiO3. The electronic correlations are dominantly controlled by the Se-Fe-Se angle either in the bulk phase or the monolayer phase. But the angle sensitivity increases and the orbital differentiation decreases in the monolayer phase compared to the bulk phase. The correlations are more dependent on Hund’s J than Hubbard U. The observed orbital selective incoherence to coherence crossover with temperature confirms the Hund’s metallic nature of the monolayer FeSe. We also find electron doping by oxygen vacancies in SrTiO3 increases the correlation strength, especially in the dxy orbital by reducing the Se-Fe-Se angle.

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  • Received 21 September 2016

DOI:https://doi.org/10.1103/PhysRevLett.119.067004

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Subhasish Mandal1, Peng Zhang2,*, Sohrab Ismail-Beigi1, and K. Haule3

  • 1Department of Applied Physics, Yale University, New Haven, Connecticut 06511, USA
  • 2Department of Physics, Xi’An Jiaotong University, Xi’an, Shaanxi 710049, People’s Republic of China
  • 3Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA

  • *Corresponding author. zpantz@xjtu.edu.cn

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Issue

Vol. 119, Iss. 6 — 11 August 2017

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