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

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conduction bands
illumination
electron mobility
Hall resistance
conduction
excitation
energy

Keywords

  • IR-86928
  • METIS-297197

Cite this

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
Guduru, V.K. ; Granados del Aguila, A. ; Wenderich, Sander ; Kruize, Michelle ; McCollam, A. ; Christianen, P.C.M. ; Zeitler, U. ; Brinkman, Alexander ; Rijnders, Augustinus J.H.M. ; Hilgenkamp, Johannes W.M. ; Maan, J.C. / Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures. In: Applied physics letters. 2013 ; Vol. 102, No. 051604. pp. -.
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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.",
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Guduru, VK, Granados del Aguila, A, Wenderich, S, Kruize, M, McCollam, A, Christianen, PCM, Zeitler, U, Brinkman, A, Rijnders, AJHM, Hilgenkamp, JWM & Maan, JC 2013, 'Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures' Applied physics letters, vol. 102, no. 051604, 051604, pp. -. https://doi.org/10.1063/1.4790844

Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures. / Guduru, V.K.; Granados del Aguila, A.; Wenderich, Sander; Kruize, Michelle; McCollam, A.; Christianen, P.C.M.; Zeitler, U.; Brinkman, Alexander; Rijnders, Augustinus J.H.M.; Hilgenkamp, Johannes W.M.; Maan, J.C.

In: Applied physics letters, Vol. 102, No. 051604, 051604, 2013, p. -.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures

AU - Guduru, V.K.

AU - Granados del Aguila, A.

AU - Wenderich, Sander

AU - Kruize, Michelle

AU - McCollam, A.

AU - Christianen, P.C.M.

AU - Zeitler, U.

AU - Brinkman, Alexander

AU - Rijnders, Augustinus J.H.M.

AU - Hilgenkamp, Johannes W.M.

AU - Maan, J.C.

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AB - 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.

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Guduru VK, Granados del Aguila A, Wenderich S, Kruize M, McCollam A, Christianen PCM et al. Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures. Applied physics letters. 2013;102(051604):-. 051604. https://doi.org/10.1063/1.4790844