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

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

doi:10.1038/nmat4623

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

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

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	835-839
Journal	Nature Materials
Volume	15
Issue number	8
Early online date	11 Apr 2016
DOIs	https://doi.org/10.1038/nmat4623
Publication status	Published - Aug 2016

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© 2016, the Author(s). This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.nature.com / https://dx.doi.org/10.1038/nmat4623
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Royal Society Research Fellowship: Electronic structure engineering of novel topological phases
King, P. (PI)
The Royal Society
1/10/13 → 30/09/18
Project: Fellowship
Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, S. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Cite this

Wang, Z., Walker, S. M., Tamai, A., Wang, Y., Ristic, Z., Bruno, F. Y., Torre, A. D. L., 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., ... Baumberger, F. (2016). Tailoring the nature and strength of electron-phonon interactions in the SrTiO₃(001) 2D electron liquid. Nature Materials, 15(8), 835-839. https://doi.org/10.1038/nmat4623

@article{9fadb3a6df854f4f92764cc721611eb3,

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

abstract = "Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides1–4. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface5–7 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 interface8–13, 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.",

author = "Z. Wang and Walker, {S. McKeown} and A. Tamai and Y. Wang and Z. Ristic and Bruno, {F. Y.} and Torre, {A. de la} and S. Ricc{\`o} and Plumb, {N. C.} and M. Shi and P. Hlawenka and J. S{\'a}nchez-Barriga and A. Varykhalov and Kim, {T. K.} and M. Hoesch and King, {P. D. C.} and W. Meevasana and U. Diebold and J. Mesot and B. Moritz and Devereaux, {T. P.} and M. Radovic and F. Baumberger",

year = "2016",

month = aug,

doi = "10.1038/nmat4623",

language = "English",

volume = "15",

pages = "835--839",

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Wang, Z, Walker, SM, Tamai, A, Wang, Y, Ristic, Z, Bruno, FY, Torre, ADL, Riccò, S, Plumb, NC, Shi, M, Hlawenka, P, Sánchez-Barriga, J, Varykhalov, A, Kim, TK, Hoesch, M, King, PDC, Meevasana, W, Diebold, U, Mesot, J, Moritz, B, Devereaux, TP, Radovic, M & Baumberger, F 2016, 'Tailoring the nature and strength of electron-phonon interactions in the SrTiO₃(001) 2D electron liquid', Nature Materials, vol. 15, no. 8, pp. 835-839. https://doi.org/10.1038/nmat4623

TY - JOUR

T1 - Tailoring the nature and strength of electron-phonon interactions in the SrTiO3(001) 2D electron liquid

AU - Wang, Z.

AU - Walker, S. McKeown

AU - Tamai, A.

AU - Wang, Y.

AU - Ristic, Z.

AU - Bruno, F. Y.

AU - Torre, A. de la

AU - Riccò, S.

AU - Plumb, N. C.

AU - Shi, M.

AU - Hlawenka, P.

AU - Sánchez-Barriga, J.

AU - Varykhalov, A.

AU - Kim, T. K.

AU - Hoesch, M.

AU - King, P. D. C.

AU - Meevasana, W.

AU - Diebold, U.

AU - Mesot, J.

AU - Moritz, B.

AU - Devereaux, T. P.

AU - Radovic, M.

AU - Baumberger, F.

PY - 2016/8

Y1 - 2016/8

N2 - Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides1–4. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface5–7 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 interface8–13, 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.

AB - Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides1–4. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface5–7 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 interface8–13, 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.

U2 - 10.1038/nmat4623

DO - 10.1038/nmat4623

M3 - Article

SN - 1476-1122

VL - 15

SP - 835

EP - 839

JO - Nature Materials

JF - Nature Materials

IS - 8

ER -

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

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Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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