title: Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface.
abstract: With infrared ellipsometry and transport measurements we investigated the electrons at the interface between LaAlO3 and SrTiO3. We obtained a sheet carrier concentration of N(s) approximately = 5-9x10(13) cm(-2), an effective mass of m*=3.2+/-0.4m(e), and a strongly frequency dependent mobility. The latter are similar as in bulk SrTi(1-x)Nb(x)O3 and therefore suggestive of polaronic correlations. We also determined the vertical concentration 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.
authors.affiliation: University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
authors.forename: A
authors.initials: A
authors.lastname: Dubroka
authors.forename: M
authors.initials: M
authors.lastname: Rössle
authors.forename: K W
authors.initials: KW
authors.lastname: Kim
authors.forename: V K
authors.initials: VK
authors.lastname: Malik
authors.forename: L
authors.initials: L
authors.lastname: Schultz
authors.forename: S
authors.initials: S
authors.lastname: Thiel
authors.forename: C W
authors.initials: CW
authors.lastname: Schneider
authors.forename: J
authors.initials: J
authors.lastname: Mannhart
authors.forename: G
authors.initials: G
authors.lastname: Herranz
authors.forename: O
authors.initials: O
authors.lastname: Copie
authors.forename: M
authors.initials: M
authors.lastname: Bibes
authors.forename: A
authors.initials: A
authors.lastname: Barthélémy
authors.forename: C
authors.initials: C
authors.lastname: Bernhard