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Magneto-tunable photocurrent in manganite-based heterojunctions

Author

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  • Z. G. Sheng

    (RIKEN Center for Emergent Matter Science (CEMS)
    Present address: High Magnetic Field Laboratory of Chinese Academy of Science, Hefei 230031, P.R. China)

  • M. Nakamura

    (RIKEN Center for Emergent Matter Science (CEMS))

  • W. Koshibae

    (RIKEN Center for Emergent Matter Science (CEMS))

  • T. Makino

    (RIKEN Center for Emergent Matter Science (CEMS))

  • Y. Tokura

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

  • M. Kawasaki

    (RIKEN Center for Emergent Matter Science (CEMS)
    University of Tokyo)

Abstract

Correlated electron oxide heterojunctions and their photovoltaic effect have attracted increasing attention from the viewpoints of both possible application to novel devices and basic science. In such junctions, correlated electron physics has to be taken into account in addition to conventional semiconductor modelling to explain distinctively emerging features. However, extracting novel functionalities has not been easy because it is not possible to predict their interfacial properties solely from their bulk characteristics. Here we describe a magneto-tunable photocurrent in a pn junction based on a correlated electron oxide La0.7Sr0.3MnO3 combined with a semiconducting SrTiO3 substrate. On applying an epitaxial strain, the photocurrent is enhanced threefold, which is increased 30% further by a magnetic field. Such a magneto-tunable effect is possible for only a narrow window of the correlated gap, which is itself adjusted by bandwidth and temperature. These results provide a guideline for utilization of correlated phenomena into the novel electronic devices.

Suggested Citation

  • Z. G. Sheng & M. Nakamura & W. Koshibae & T. Makino & Y. Tokura & M. Kawasaki, 2014. "Magneto-tunable photocurrent in manganite-based heterojunctions," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5584
    DOI: 10.1038/ncomms5584
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