Journal
NATURE MATERIALS
Volume 15, Issue 8, Pages 835-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4623
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Funding
- Swiss National Science Foundation [200021-146995]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- Computational Materials and Chemical Sciences Network (CMCSN) [DE-SC0007091]
- US Department of Energy, Office of Science [DE-AC02-05CH11231]
- Sino-Swiss Science and Technology Cooperation [IZLCZ2138954]
- Impuls- und Vernetzungsfonds der Helmholtz Gemeinschaft [HRJRG-408]
- UK-EPSRC [EP/I031014/1]
- Royal Society
- ERC Advanced Grant 'OxideSurfaces'
- Thailand Research Fund (TRF) under the TRF Senior Research Scholar [RTA5680008]
- Engineering and Physical Sciences Research Council [EP/I031014/1] Funding Source: researchfish
- EPSRC [EP/I031014/1] Funding Source: UKRI
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Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides(1-4). Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface(5-7) to reveal a remarkably complex evolution of electron-phonon coupling with the tunable carrier density of this system. At low density, where superconductivity is found in the analogous 2DEL at the LaAlO3/SrTiO3 interface(8-13), our angle-resolved photoemission data show replica bands separated by 100 meV from the main bands. This is a hallmark of a coherent polaronic liquid and implies long-range coupling to a single longitudinal optical phonon branch. In the overdoped regime the preferential coupling to this branch decreases and the 2DEL undergoes a crossover to a more conventional metallic state with weaker short-range electron-phonon interaction. These results place constraints on the theoretical description of superconductivity and allow a unified understanding of the transport properties in SrTiO3-based 2DELs.
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