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Copie O, Garcia V, Bödefeld C, et al. Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces. Phys Rev Lett. 2009;102(21):216804doi: 10.1103/PhysRevLett.102.216804.
Copie, O., Garcia, V., Bödefeld, C., Carrétéro, C., Bibes, M., Herranz, G., Jacquet, E., Maurice, J. L., Vinter, B., Fusil, S., Bouzehouane, K., Jaffrès, H., & Barthélémy, A. (2009). Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces. Physical review letters, 102(21), 216804. https://doi.org/10.1103/PhysRevLett.102.216804
Copie, O, et al. "Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces." Physical review letters vol. 102,21 (2009): 216804. doi: https://doi.org/10.1103/PhysRevLett.102.216804
Copie O, Garcia V, Bödefeld C, Carrétéro C, Bibes M, Herranz G, Jacquet E, Maurice JL, Vinter B, Fusil S, Bouzehouane K, Jaffrès H, Barthélémy A. Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces. Phys Rev Lett. 2009 May 29;102(21):216804. doi: 10.1103/PhysRevLett.102.216804. Epub 2009 May 29. PMID: 19519126.
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Phys Rev Lett. 2009 May 29;102(21):216804. doi: 10.1103/PhysRevLett.102.216804. Epub 2009 May 29.

Towards two-dimensional metallic behavior at LaAlO3/SrTiO3 interfaces.

Physical review letters

O Copie, V Garcia, C Bödefeld, C Carrétéro, M Bibes, G Herranz, E Jacquet, J-L Maurice, B Vinter, S Fusil, K Bouzehouane, H Jaffrès, A Barthélémy

Affiliations

  1. Unité Mixte de Physique CNRS/Thales, Campus de l'Ecole Polytechnique, 1 Av. A. Fresnel, 91767 Palaiseau, France.

PMID: 19519126 DOI: 10.1103/PhysRevLett.102.216804

Abstract

Using a low-temperature conductive-tip atomic force microscope in cross-section geometry we have characterized the local transport properties of the metallic electron gas that forms at the interface between LaAlO3 and SrTiO3. At low temperature, we find that the carriers do not spread away from the interface but are confined within approximately 10 nm, just like at room temperature. Simulations taking into account both the large temperature and electric-field dependence of the permittivity of SrTiO3 predict a confinement over a few nm for sheet carrier densities larger than approximately 6x10(13) cm(-2). We discuss the experimental and simulations results in terms of a multiband carrier system. Remarkably, the Fermi wavelength estimated from Hall measurements is approximately 16 nm, indicating that the electron gas in on the verge of two dimensionality.

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