Impact Factor:0.0
DOI number:10.1103/PhysRevLett.125.126401
Journal:Physical Review Letters
Abstract:Despite its simple structure and low degree of electronic correlation,
SrTiO3 (STO) features collective phenomena linked to charge transport and, ultimately, superconductivity, that are not yet fully explained. Thus, a better insight into the nature of the quasiparticles shaping the electronic and conduction properties of STO is needed. We studied the low-energy excitations of bulk STO and of the
LaAlO3/SrTiO3 two-dimensional electron gas (2DEG) by Ti L3 edge resonant inelastic x-ray scattering. In all samples, we find the hallmark of polarons in the form of intense dd+phonon excitations, and a decrease of the LO3-mode electron-phonon coupling when going from insulating to highly conducting STO single crystals and heterostructures. Both results are attributed to the dynamic screening of the large polaron self-induced polarization, showing that the low-temperature physics of STO and STO-based 2DEGs is dominated by large polaron quasiparticles.
Discipline:Natural Science
First-Level Discipline:Physics
Volume:125
Issue:12
Page Number:126401
Translation or Not:no
Date of Publication:2020-09-15
Included Journals:SCI
First Author:Andrey Geondzhian
Correspondence Author:Marco Salluzzo
All the Authors:Alessia Sambri,Gabriella M. De Luca,Roberto Di Capua,Emiliano Di Gennaro,Davide Betto,Matteo Rossi,Ying Ying Peng,Roberto Fumagalli,Nicholas B. Brookes,Lucio Braicovich,Keith Gilmore,Giacomo Ghiringhelli
Date of Publication:2020-09-15