Tuning the two-dimensional electron liquid at oxide interfaces by buffer-layer-engineered redox reactions

Yunzhong Chen, Robert J. Green, Ronny Sutarto, Feizhou He, Søren Linderoth, George A. Sawatzky, Nini Pryds

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Abstract

Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant x-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.
Original languageEnglish
JournalNano Letters
Volume17
Issue number11
Pages (from-to)7062–7066
ISSN1530-6984
DOIs
Publication statusPublished - 2017

Cite this

Chen, Yunzhong ; Green, Robert J. ; Sutarto, Ronny ; He, Feizhou ; Linderoth, Søren ; Sawatzky, George A. ; Pryds, Nini. / Tuning the two-dimensional electron liquid at oxide interfaces by buffer-layer-engineered redox reactions. In: Nano Letters. 2017 ; Vol. 17, No. 11. pp. 7062–7066.
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abstract = "Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant x-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.",
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Tuning the two-dimensional electron liquid at oxide interfaces by buffer-layer-engineered redox reactions. / Chen, Yunzhong; Green, Robert J. ; Sutarto, Ronny ; He, Feizhou; Linderoth, Søren; Sawatzky, George A. ; Pryds, Nini.

In: Nano Letters, Vol. 17, No. 11, 2017, p. 7062–7066.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Chen, Yunzhong

AU - Green, Robert J.

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AU - He, Feizhou

AU - Linderoth, Søren

AU - Sawatzky, George A.

AU - Pryds, Nini

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N2 - Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant x-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.

AB - Polar discontinuities and redox reactions provide alternative paths to create two-dimensional electron liquids (2DELs) at oxide interfaces. Herein, we report high mobility 2DELs at interfaces involving SrTiO3 (STO) achieved using polar La7/8Sr1/8MnO3 (LSMO) buffer layers to manipulate both polarities and redox reactions from disordered overlayers grown at room temperature. Using resonant x-ray reflectometry experiments, we quantify redox reactions from oxide overlayers on STO as well as polarity induced electronic reconstruction at epitaxial LSMO/STO interfaces. The analysis reveals how these effects can be combined in a STO/LSMO/disordered film trilayer system to yield high mobility modulation doped 2DELs, where the buffer layer undergoes a partial transformation from perovskite to brownmillerite structure. This uncovered interplay between polar discontinuities and redox reactions via buffer layers provides a new approach for the design of functional oxide interfaces.

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