What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study

Li, Zi-Xiang; Wang, Fa; Yao, Hong; Lee, Dung-Hai

doi:10.1007/s11434-016-1087-x

Title: What makes the T_c of monolayer FeSe on SrTiO₃ so high: a sign-problem-free quantum Monte Carlo study

Journal Article · Sat Apr 30 00:00:00 EDT 2016 · Science Bulletin

DOI:https://doi.org/10.1007/s11434-016-1087-x· OSTI ID:1414758

Li, Zi-Xiang ^[1]; Wang, Fa ^[2]; Yao, Hong ^[3]; Lee, Dung-Hai ^[4]

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

Monolayer FeSe films grown on SrTiO₃ (STO) substrate show superconducting gap-opening temperatures (T_c) 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 T_c 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 T_c. Armed with these results, we return to the question “what makes the T_c of monolayer FeSe on SrTiO₃ so high?” in the conclusion and discussions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC02-05CH11231; 11474175; 11374018

OSTI ID:: 1414758

Journal Information:: Science Bulletin, Vol. 61, Issue 12; ISSN 2095-9273

Publisher:: Elsevier; Science China PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 89 works

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Title: What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study

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Title: What makes the T_c of monolayer FeSe on SrTiO₃ so high: a sign-problem-free quantum Monte Carlo study