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Tailoring the nature and strength of electron-phonon interactions in the SrTiO3(001) 2D electron liquid

Wang, Z ; McKeown Walker, S ; Tamai, A ; Wang, Y ; Ristic, Z ; Bruno, F Y ; de la Torre, A ; Riccò, S ; Plumb, N C ; Shi, M ; Hlawenka, P ; Sánchez-Barriga, J ; Varykhalov, A ; Kim, T K ; Hoesch, M ; King, P D C ; Meevasana, W ; Diebold, U ; Mesot, J ; Moritz, B ; Devereaux, T P ; Radovic, M ; Baumberger, F

Nature materials, 2016-08, Vol.15 (8), p.835-839 [Periódico revisado por pares]

England

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  • Título:
    Tailoring the nature and strength of electron-phonon interactions in the SrTiO3(001) 2D electron liquid
  • Autor: Wang, Z ; McKeown Walker, S ; Tamai, A ; Wang, Y ; Ristic, Z ; Bruno, F Y ; de la Torre, A ; Riccò, S ; Plumb, N C ; Shi, M ; Hlawenka, P ; Sánchez-Barriga, J ; Varykhalov, A ; Kim, T K ; Hoesch, M ; King, P D C ; Meevasana, W ; Diebold, U ; Mesot, J ; Moritz, B ; Devereaux, T P ; Radovic, M ; Baumberger, F
  • É parte de: Nature materials, 2016-08, Vol.15 (8), p.835-839
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface 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, 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.
  • Editor: England
  • Idioma: Inglês
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