What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study
Abstract
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 Tc enhancement 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 Tc of monolayer FeSe on SrTiO3 so high?” in the conclusion and discussions.
- Authors:
-
- Tsinghua Univ., Beijing (China). Inst. for Advanced Study
- Peking Univ., Beijing (China). International Center for Quantum Materials. School of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Tsinghua Univ., Beijing (China). Inst. for Advanced Study; Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1414758
- Grant/Contract Number:
- AC02-05CH11231; 11474175; 11374018
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Science Bulletin
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 12; Journal ID: ISSN 2095-9273
- Publisher:
- Elsevier; Science China Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; high temperature superconductivity; pairing mechanism; iron-based superconductivity; FeSe/STO; sign-problem-free quantum Monte-Carlo simulation
Citation Formats
Li, Zi-Xiang, Wang, Fa, Yao, Hong, and Lee, Dung-Hai. What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study. United States: N. p., 2016.
Web. doi:10.1007/s11434-016-1087-x.
Li, Zi-Xiang, Wang, Fa, Yao, Hong, & Lee, Dung-Hai. What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study. United States. https://doi.org/10.1007/s11434-016-1087-x
Li, Zi-Xiang, Wang, Fa, Yao, Hong, and Lee, Dung-Hai. Sat .
"What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study". United States. https://doi.org/10.1007/s11434-016-1087-x. https://www.osti.gov/servlets/purl/1414758.
@article{osti_1414758,
title = {What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study},
author = {Li, Zi-Xiang and Wang, Fa and Yao, Hong and Lee, Dung-Hai},
abstractNote = {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 Tc enhancement 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 Tc of monolayer FeSe on SrTiO3 so high?” in the conclusion and discussions.},
doi = {10.1007/s11434-016-1087-x},
journal = {Science Bulletin},
number = 12,
volume = 61,
place = {United States},
year = {Sat Apr 30 00:00:00 EDT 2016},
month = {Sat Apr 30 00:00:00 EDT 2016}
}
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