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Quantum Monte Carlo study of the $T_c$ enhancement mechanism in FeSe on SrTiO$_3$ | | Zi-Xiang Li
; Fa Wang
; Hong Yao
; Dung-Hai Lee
; | | Date: |
19 Dec 2015 | | Abstract: | Single unit cell thick FeSe films grown on SrTiO$_3$ substrate
[(FeSe)$_1$/STO] show superconducting gap and gap closing $T_c$ which are
almost an order of magnitude larger than those of the bulk FeSe. This large
enhancement of superconductivity is unique among all FeSe-based
superconductors. This fact and the angle-resolved photoemission spectroscopy
observation of "replica" bands in (FeSe)$_1$/STO suggest that the interaction
between FeSe electrons and STO phonons is the mechanism responsible for the
$T_c$ enhancement. Here we study the cooperation between electron-phonon and
pure electron mechanisms of pairing by unbiased sign-problem-free quantum Monte
Carlo computation on effective models capturing the low energy physics of
(FeSe)$_1$/STO. Our results clearly indicate that irrespective to the pure
electronic driving force of Cooper pairing and the resulting pairing symmetry,
nematic fluctuations and especially forward-focusing electron-phonon couplings
significantly enhance the superconductivity. | | Source: | arXiv, 1512.6179 | | Services: | Forum | Review | PDF | Favorites | |
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