Large Polarons as Key Quasiparticles in SrTiO3 and SrTiO3-Based Heterostructures

Geondzhian, Andrey; Sambri, Alessia; De Luca, Gabriella M.; Di Capua, Roberto; Di Gennaro, Emiliano; Betto, Davide; Rossi, Matteo; Peng, Ying Ying; Fumagalli, Roberto; Brookes, Nicholas B.; Braicovich, Lucio; Gilmore, Keith; Ghiringhelli, Giacomo; Salluzzo, Marco

doi:10.1103/physrevlett.125.126401

Title: Large Polarons as Key Quasiparticles in SrTiO₃ and SrTiO₃-Based Heterostructures

Journal Article · 15 September 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.125.126401 · OSTI ID:1668633

Geondzhian, Andrey ^[1]; Sambri, Alessia ^[2]; De Luca, Gabriella M. ^[3]; Di Capua, Roberto ^[3]; Di Gennaro, Emiliano ^[3]; Betto, Davide ^[4];

^[5];

^[6]; Fumagalli, Roberto ^[7]; Brookes, Nicholas B. ^[1]; Braicovich, Lucio ^[8]; Gilmore, Keith ^[9];

^[10];

^[2]

European Synchrotron Radiation Facility (ESRF), Grenoble (France)
CNR-SPIN Complesso Monte-Santangelo, Napoli (Italy)
CNR-SPIN Complesso Monte-Santangelo, Napoli (Italy); Univ. di Napoli (Italy)
European Synchrotron Radiation Facility (ESRF), Grenoble (France); Max Planck Inst. für Festkörperforschung, Stuttgart (Germany)
Politecnico di Milano (Italy); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
Politecnico di Milano (Italy); Peking Univ., Beijing (China)
Politecnico di Milano (Italy)
European Synchrotron Radiation Facility (ESRF), Grenoble (France); Politecnico di Milano (Italy)
European Synchrotron Radiation Facility (ESRF), Grenoble (France); Brookhaven National Lab. (BNL), Upton, NY (United States)
Politecnico di Milano (Italy); CNR-SPIN, Milano (Italy)

Despite its simple structure and low degree of electronic correlation, ${SrTiO}_{3}$ (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 ${LaAlO}_{3} / {SrTiO}_{3}$ two-dimensional electron gas (2DEG) by Ti $L_{3}$ edge resonant inelastic x-ray scattering. In all samples, we find the hallmark of polarons in the form of intense $d d + phonon$ excitations, and a decrease of the LO3-mode electron-phonon coupling when going from insulating to highly conducting STO single crystals and heterostructures. Overall, 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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); MIUR; EU Horizon 2020; Regione Lombardia

Grant/Contract Number:: SC0012704

OSTI ID:: 1668633

Report Number(s):: BNL--219851-2020-JAAM

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 125; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Large Polarons as Key Quasiparticles in SrTiO₃ and SrTiO₃-Based Heterostructures