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Title: Electronic and phononic properties of a two-dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering

Journal Article · · Physical Review B
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
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We study the electron and phonon spectral functions as well as superconductivity for a two-dimensional electron gas coupled to dipolar phonons via small-momentum-transfer scattering. The results reported here are obtained through sign-problem-free quantum Monte Carlo simulation. Hence, aside from modeling there are no further approximations. Our results can be relevant to the high-temperature superconductor at the interface between a unit-cell-thick FeSe and SrTiO3. Our results give support to the interpretation that the observed replica band in unit-cell-thick FeSe on SrTiO3 is due to the small-momentum transfer interaction between the FeSe electrons and a branch of polar STO phonons. Furthermore, we conclude that while the small-momentum electron-phonon interaction can not induce strong Cooper pairing by itself, it can enhance the Cooper pairing triggered by other pairing interactions.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515
OSTI ID:
1594966
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 24 Vol. 100; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3 text January 2013
Renormalization of spectra by phase competition in the half-filled Hubbard-Holstein model text January 2015
Constrained sampling method for analytic continuation text January 2015
Common Electronic Origin of Superconductivity in (Li,Fe)OHFeSe Bulk Superconductor and Single-Layer FeSe/SrTiO3 Films text January 2015
Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb doped SrTiO3 substrate text January 2015
What makes the Tc of monolayer FeSe on SrTiO3 so high: a sign-problem-free quantum Monte Carlo study text January 2015
Superconducting gap anisotropy in monolayer FeSe thin film text January 2015
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Phonon linewidth due to electron-phonon interactions with strong forward scattering in FeSe thin films on oxide substrates text January 2017
Monolayer FeSe on SrTiO$_3$ text January 2017
Itinerant quantum critical point with frustration and non-Fermi-liquid text January 2017
Charge Order in the Holstein Model on a Honeycomb Lattice text January 2018
A sufficient condition for the absence of the sign problem in the fermionic quantum Monte-Carlo algorithm text January 2004

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