Observation of a two-dimensional liquid of Fröhlich polarons at the bare SrTiO3 surface

Chaoyu Chen, José Avila, Emmanouil Frantzeskakis, Anna Levy and Maria C. Asensio ()
Additional contact information
Chaoyu Chen: Synchrotron SOLEIL, Beamline ANTARES, L’Orme des Merisiers, Saint Aubin-BP 48
José Avila: Synchrotron SOLEIL, Beamline ANTARES, L’Orme des Merisiers, Saint Aubin-BP 48
Emmanouil Frantzeskakis: Synchrotron SOLEIL, Beamline ANTARES, L’Orme des Merisiers, Saint Aubin-BP 48
Anna Levy: Synchrotron SOLEIL, Beamline ANTARES, L’Orme des Merisiers, Saint Aubin-BP 48
Maria C. Asensio: Synchrotron SOLEIL, Beamline ANTARES, L’Orme des Merisiers, Saint Aubin-BP 48

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract The polaron is a quasi-particle formed by a conduction electron (or hole) together with its self-induced polarization in a polar semiconductor or an ionic crystal. Among various polarizable examples of complex oxides, strontium titanate (SrTiO3) is one of the most studied. Here we examine the carrier type and the interplay of inner degrees of freedom (for example, charge, lattice, orbital) in SrTiO3. We report the experimental observation of Fröhlich polarons, or large polarons, at the bare SrTiO3 surface prepared by vacuum annealing. Systematic analyses of angle-resolved photoemission spectroscopy and X-ray absorption spectra show that these Fröhlich polarons are two-dimensional and only exist with inversion symmetry breaking by two-dimensional oxygen vacancies. Our discovery provides a rare solvable field theoretical model, and suggests the relevance of large (bi)polarons for superconductivity in perovskite oxides, as well as in high-temperature superconductors.

Date: 2015
References: Add references at CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.nature.com/articles/ncomms9585 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9585

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/ncomms9585

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().