Gate-dependent Raman and spatially resolved VEELS show FeSe phonons soften with gate voltage and FeSe plasmons red-shift near the FeSe/SrTiO3 interface, suggesting nonlocal interfacial coupling.
Zhao et al., Science Advances 4 (2018), 10.1126/sciadv.aao2682
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Spectroscopic Signatures of Nonlocal Interfacial Coupling in Superconducting FeSe/SrTiO3 Heterostructures
Gate-dependent Raman and spatially resolved VEELS show FeSe phonons soften with gate voltage and FeSe plasmons red-shift near the FeSe/SrTiO3 interface, suggesting nonlocal interfacial coupling.