Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures

V. K. Guduru; A. Granados del Aguila; S. Wenderich; M. K. Kruize; A. McCollam; P. C. M. Christianen; U. Zeitler; A. Brinkman; G. Rijnders; H. Hilgenkamp; J. C. Maan

doi:10.1063/1.4790844

Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures

Materials Science 2013-02-11 v1

Authors: V. K. Guduru , A. Granados del Aguila , S. Wenderich , M. K. Kruize , A. McCollam , P. C. M. Christianen , U. Zeitler , A. Brinkman , G. Rijnders , H. Hilgenkamp , J. C. Maan

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Abstract

The low-temperature resistance of a conducting LaAlO3/SrTiO3 interface with a 10 nm thick 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.

Keywords

LaAlO3/SrTiO3 heterostructures optical excitation multi-band conduction high mobility electron channel non-linear Hall resistance two-carrier model photo-excited carriers

Cite

@article{arxiv.1211.4778,
  title  = {Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures},
  author = {V. K. Guduru and A. Granados del Aguila and S. Wenderich and M. K. Kruize and A. McCollam and P. C. M. Christianen and U. Zeitler and A. Brinkman and G. Rijnders and H. Hilgenkamp and J. C. Maan},
  journal= {arXiv preprint arXiv:1211.4778},
  year   = {2013}
}

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4 pages, 3 figures

Optically excited multi-band conduction in LaAlO3/SrTiO3 heterostructures

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