Dynamical Response and Confinement of the Electrons at the LaAlO3/SrTiO3 Interface

被引：86

作者：

Dubroka, A. ^{[1
,2
]}

Roessle, M. ^{[1
,2
]}

Kim, K. W. ^{[1
,2
]}

Malik, V. K. ^{[1
,2
]}

Schultz, L. ^{[1
,2
]}

Thiel, S. ^{[3
]}

Schneider, C. W. ^{[3
,4
]}

Mannhart, J. ^{[3
]}

Herranz, G. ^{[5
]}

Copie, O. ^{[5
]}

Bibes, M. ^{[5
]}

Barthelemy, A. ^{[5
]}

Bernhard, C. ^{[1
,2
]}

机构：

[1] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[2] Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland

[3] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

[4] Paul Scherrer Inst, Mat Grp, CH-5232 Villigen, Switzerland

[5] Thales Assoc Univ Paris Sud, Unite Mixte Phys, CNRS, F-91767 Palaiseau, France

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 15期

关键词：

FAR-INFRARED ELLIPSOMETRY;

D O I：

10.1103/PhysRevLett.104.156807

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 approximate to 5-9 x 10(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 SrTi1-xNbxO3 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.

引用

页数：4

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