Switchable Induced Polarization in LaAlO3/SrTiO3 Heterostructures

被引：173

作者：

Bark, C. W. ^{[1
]}

Sharma, P. ^{[2
]}

Wang, Y. ^{[2
]}

Baek, S. H. ^{[1
]}

Lee, S. ^{[1
]}

Ryu, S. ^{[1
]}

Folkman, C. M. ^{[1
]}

Paudel, T. R. ^{[2
]}

Kumar, A. ^{[4
]}

Kalinin, S. V. ^{[4
]}

Sokolov, A. ^{[2
]}

Tsymbal, E. Y. ^{[2
]}

Rzchowski, M. S. ^{[3
]}

Gruverman, A. ^{[2
]}

Eom, C. B. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA

[2] Univ Nebraska, Dept Phys & Astron, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA

[3] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[4] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

NANO LETTERS | 2012年 / 12卷 / 04期

基金：

美国国家科学基金会;

关键词：

Heterointerfaces; complex oxides; oxygen vacancies; piezoresponse force microscopy; 2-DIMENSIONAL ELECTRON-GAS; FORCE MICROSCOPY; INTERFACE; NANOSCALE; SURFACE; HETEROINTERFACE; FERROELECTRICS; MOBILITY; STATE; FILMS;

D O I：

10.1021/nl3001088

中图分类号：

O6 [化学];

学科分类号：

070301 [无机化学];

摘要：

Demonstration of a tunable conductivity of the LaAlO3/SrTiO3 interfaces drew significant attention to the development of oxide electronic structures where electronic confinement can be reduced to the nanometer range. While the mechanisms for the conductivity modulation are quite different and include metal insulator phase transition and surface charge writing, generally it is implied that this effect is a result of electrical modification of the LaAlO3 surface (either due to electrochemical dissociation of surface adsorbates or free charge deposition) leading to the change in the two-dimensional electron. gas (2DEG) density at the LaAlO3/SrTiO3 (LAO/STO) interface. In this paper, using piezoresponse force microscopy we demonstrate a switchable electromechanical response of the LAO overlayer, which we attribute to the motion of oxygen vacancies through the LAO layer thickness. These electrically induced reversible changes in bulk stoichiometry of the LAO layer are a signature of a possible additional mechanism for nanoscale oxide 2DEG control on LAO/STO interfaces.

引用

页码：1765 / 1771

页数：7

共 39 条

[1]

Tunability of the dielectric response of epitaxially strained SrTiO3 from first principles -: art. no. 024102 [J].

Antons, A ;

Neaton, JB ;

Rabe, KM ;

Vanderbilt, D .

PHYSICAL REVIEW B, 2005, 71 (02)

[2]

Tailoring a two-dimensional electron gas at the LaAlO3/SrTiO3 (001) interface by epitaxial strain [J].

Bark, C. W. ;

Felker, D. A. ;

Wang, Y. ;

Zhang, Y. ;

Jang, H. W. ;

Folkman, C. M. ;

Park, J. W. ;

Baek, S. H. ;

Zhou, H. ;

Fong, D. D. ;

Pan, X. Q. ;

Tsymbal, E. Y. ;

Rzchowski, M. S. ;

Eom, C. B. .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2011, 108 (12) :4720-4724

[3]

Dominant Mobility Modulation by the Electric Field Effect at the LaAlO3/SrTiO3 Interface [J].

Bell, C. ;

Harashima, S. ;

Kozuka, Y. ;

Kim, M. ;

Kim, B. G. ;

Hikita, Y. ;

Hwang, H. Y. .

PHYSICAL REVIEW LETTERS, 2009, 103 (22)

[4]

"Water-cycle" mechanism for writing and erasing nanostructures at the LaAlO3/SrTiO3 interface [J].

Bi, Feng ;

Bogorin, Daniela F. ;

Cen, Cheng ;

Bark, Chung Wung ;

Park, Jae-Wan ;

Eom, Chang-Beom ;

Levy, Jeremy .

APPLIED PHYSICS LETTERS, 2010, 97 (17)

[5]

Suppression of Octahedral Tilts and Associated Changes in Electronic Properties at Epitaxial Oxide Heterostructure Interfaces [J].

Borisevich, A. Y. ;

Chang, H. J. ;

Huijben, M. ;

Oxley, M. P. ;

Okamoto, S. ;

Niranjan, M. K. ;

Burton, J. D. ;

Tsymbal, E. Y. ;

Chu, Y. H. ;

Yu, P. ;

Ramesh, R. ;

Kalinin, S. V. ;

Pennycook, S. J. .

PHYSICAL REVIEW LETTERS, 2010, 105 (08)

[6]

Surface defects and conduction in polar oxide heterostructures [J].

Bristowe, N. C. ;

Littlewood, P. B. ;

Artacho, Emilio .

PHYSICAL REVIEW B, 2011, 83 (20)

[7]

Imaging oxygen defects and their motion at a manganite surface [J].

Bryant, B. ;

Renner, Ch. ;

Tokunaga, Y. ;

Tokura, Y. ;

Aeppli, G. .

NATURE COMMUNICATIONS, 2011, 2

[8]

Electrostriction at the LaAlO3/SrTiO3 Interface [J].

Cancellieri, C. ;

Fontaine, D. ;

Gariglio, S. ;

Reyren, N. ;

Caviglia, A. D. ;

Fete, A. ;

Leake, S. J. ;

Pauli, S. A. ;

Willmott, P. R. ;

Stengel, M. ;

Ghosez, Ph. ;

Triscone, J. -M. .

PHYSICAL REVIEW LETTERS, 2011, 107 (05)

[9]

Electric field control of the LaAlO3/SrTiO3 interface ground state [J].

Caviglia, A. D. ;

Gariglio, S. ;

Reyren, N. ;

Jaccard, D. ;

Schneider, T. ;

Gabay, M. ;

Thiel, S. ;

Hammerl, G. ;

Mannhart, J. ;

Triscone, J. -M. .

NATURE, 2008, 456 (7222) :624-627

[10]

Nanoscale control of an interfacial metal-insulator transition at room temperature [J].

Cen, C. ;

Thiel, S. ;

Hammerl, G. ;

Schneider, C. W. ;

Andersen, K. E. ;

Hellberg, C. S. ;

Mannhart, J. ;

Levy, J. .

NATURE MATERIALS, 2008, 7 (04) :298-302

← 1 2 3 4 →