Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures

V.K. Guduru, A. Granados del Aguila, Sander Wenderich, Michelle Kruize, A. McCollam, P.C.M. Christianen, U. Zeitler, Alexander Brinkman, Augustinus J.H.M. Rijnders, Johannes W.M. Hilgenkamp, J.C. Maan

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Abstract

The low-temperature resistance of a conducting LaAlO3/SrTiO3 interface with a 10 nm LaAlO3 film decreases by more than 50% after illumination with light of energy higher than the SrTiO3 band-gap. We explain our observations by optical excitation of an additional high mobility electron channel, which is spatially separated from the photo-excited holes. After illumination, we measure a strongly non-linear Hall resistance which is governed by the concentration and mobility of the photo-excited carriers. This can be explained within a two-carrier model where illumination creates a high mobility electron channel in addition to a low mobility electron channel which exists before illumination.
Original languageEnglish
Article number051604
Pages (from-to)-
Number of pages4
JournalApplied physics letters
Volume102
Issue number051604
DOIs
Publication statusPublished - 2013

Keywords

  • IR-86928
  • METIS-297197

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    Guduru, V. K., Granados del Aguila, A., Wenderich, S., Kruize, M., McCollam, A., Christianen, P. C. M., ... Maan, J. C. (2013). Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures. Applied physics letters, 102(051604), -. [051604]. https://doi.org/10.1063/1.4790844