Towards Two-Dimensional Metallic Behavior at LaAlO3/SrTiO3 Interfaces

被引：137

作者：

Copie, O. ^{[1
,5
]}

Garcia, V. ^{[1
,5
]}

Boedefeld, C. ^{[2
]}

Carretero, C. ^{[1
,5
]}

Bibes, M. ^{[1
,5
]}

Herranz, G. ^{[1
,5
]}

Jacquet, E. ^{[1
,5
]}

Maurice, J. -L. ^{[1
,5
]}

Vinter, B. ^{[1
,3
,5
]}

Fusil, S. ^{[1
,4
,5
]}

Bouzehouane, K. ^{[1
,5
]}

Jaffres, H. ^{[1
,5
]}

Barthelemy, A. ^{[1
,5
]}

机构：

[1] Unite Mixte Phys CNRS Thales, F-91767 Palaiseau, France

[2] Attocube Syst AG, D-80539 Munich, Germany

[3] Univ Nice, Dept Phys, F-06102 Nice 2, France

[4] Univ Evry Val dEssone, F-91025 Evry, France

[5] Univ Paris 11, F-91405 Orsay, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 21期

关键词：

ATOMIC-FORCE MICROSCOPY; DIELECTRIC-PROPERTIES; STRONTIUM-TITANATE; SINGLE-CRYSTAL; ELECTRIC-FIELD; SRTIO3; HETEROSTRUCTURES; INSULATOR; MOBILITY;

D O I：

10.1103/PhysRevLett.102.216804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 similar to 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 similar to 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 similar to 16 nm, indicating that the electron gas in on the verge of two dimensionality.

引用

页数：4

共 31 条

[1] Effect of electric field and post-treatment on dielectric behavior of SrTiO3 single crystal [J].