Dynamical response and confinement of the electrons at the LaAlO3/SrTiO3 interface.
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.
Dubroka
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University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Chemin du Musée 3, CH-1700 Fribourg, Switzerland.
Rössle
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Kim
K W
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Malik
V K
VK
Schultz
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L
Thiel
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Schneider
C W
CW
Mannhart
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J
Herranz
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Copie
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Bibes
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Barthélémy
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Bernhard
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