Interfacial Electron-Phonon Coupling Constants Extracted from Intrinsic Replica Bands in Monolayer FeSe/SrTiO3

Faeth, Brendan D.; Xie, Saien; Yang, Shuolong; Kawasaki, Jason K.; Nelson, Jocienne N.; Zhang, Shuyuan; Parzyck, Christopher; Mishra, Pramita; Li, Chen; Jozwiak, Christopher; Bostwick, Aaron; Rotenberg, Eli; Schlom, Darrell G.; Shen, Kyle M.

doi:10.1103/physrevlett.127.016803

Title: Interfacial Electron-Phonon Coupling Constants Extracted from Intrinsic Replica Bands in Monolayer FeSe/SrTiO₃

Journal Article · Wed Jun 30 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.127.016803· OSTI ID:1821672

Faeth, Brendan D. ^[1]; Xie, Saien ^[1]; Yang, Shuolong ^[2];

^[3]; Nelson, Jocienne N. ^[1]; Zhang, Shuyuan ^[1]; Parzyck, Christopher ^[1]; Mishra, Pramita ^[1]; Li, Chen ^[1];

^[4]; Bostwick, Aaron ^[4];

^[4]; Schlom, Darrell G. ^[5]; Shen, Kyle M. ^[3]

Cornell Univ., Ithaca, NY (United States). Laboratory of Atomic and Solid State Physics
Cornell Univ., Ithaca, NY (United States). Laboratory of Atomic and Solid State Physics, Kavli Institute at Cornell for Nanoscale Science, and Department of Materials Science and Engineering
Cornell Univ., Ithaca, NY (United States). Laboratory of Atomic and Solid State Physics, Kavli Institute at Cornell for Nanoscale Science
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Cornell Univ., Ithaca, NY (United States). Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science

The observation of replica bands by angle-resolved photoemission spectroscopy has ignited interest in the study of electron-phonon coupling at low carrier densities, particularly in monolayer FeSe/SrTiO₃, where the appearance of replica bands has motivated theoretical work suggesting that the interfacial coupling of electrons in the FeSe layer to optical phonons in the SrTiO₃ substrate might contribute to the enhanced superconducting pairing temperature. Alternatively, it has also been recently proposed that such replica bands might instead originate from extrinsic final state losses associated with the photoemission process. Here, we perform a quantitative examination of replica bands in monolayer FeSe/SrTiO₃, where we are able to conclusively demonstrate that the replica bands are indeed signatures of intrinsic electron-boson coupling, and not associated with final state effects. A detailed analysis of the energy splittings and relative peak intensities between the higher-order replicas, as well as other self-energy effects, allows us to determine that the interfacial electron-phonon coupling in the system corresponds to a value of λ=0.19±0.02, providing valuable insights into the enhancement of superconductivity in monolayer FeSe/SrTiO₃. The methodology employed here can also serve as a new and general approach for making more rigorous and quantitative comparisons to theoretical calculations of electron-phonon interactions and coupling constants.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1821672

Journal Information:: Physical Review Letters, Vol. 127, Issue 1; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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