Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface

Details Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface

2009-10-05

arxiv.org/abs/0910.0741v1

Phys. Rev. Lett. 104, 156807 (2010)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, 1 EPAPS file (3 figures)

Scientific paper

10.1103/PhysRevLett.104.156807

With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier density of Ns~5-9x 10E13 cm^-2, an effective mass of m*~3m_e, and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi1-xNbxO3 and therefore suggestive of polaronic correlations of the confined carriers. We also determined the vertical density profile which has a strongly asymmetric shape with a rapid initial decay over the first 2 nm and a pronounced tail that extends to about 11 nm.

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