High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces

被引:161
作者
Herranz, G. [1 ]
Sanchez, F. [1 ]
Dix, N. [1 ]
Scigaj, M. [1 ]
Fontcuberta, J. [1 ]
机构
[1] Inst Ciencia Mat Barcelona ICMAB CSIC, Bellaterra 08193, Catalonia, Spain
来源
SCIENTIFIC REPORTS | 2012年 / 2卷
关键词
ELECTRON-GAS; OXIDE; SUPERCONDUCTIVITY; COEXISTENCE;
D O I
10.1038/srep00758
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In recent years, striking discoveries have revealed that two-dimensional electron liquids (2DEL) confined at the interface between oxide band-insulators can be engineered to display a high mobility transport. The recognition that only few interfaces appear to suit hosting 2DEL is intriguing and challenges the understanding of these emerging properties not existing in bulk. Indeed, only the neutral TiO2 surface of (001) SrTiO3 has been shown to sustain 2DEL. We show that this restriction can be surpassed: (110) and (111) surfaces of SrTiO3 interfaced with epitaxial LaAlO3 layers, above a critical thickness, display 2DEL transport with mobilities similar to those of (001) SrTiO3. Moreover we show that epitaxial interfaces are not a prerequisite: conducting (110) interfaces with amorphous LaAlO3 and other oxides can also be prepared. These findings open a new perspective both for materials research and for elucidating the ultimate microscopic mechanism of carrier doping.
引用
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页数:5
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