Anisotropic two-dimensional electron gas at the LaAlO3/SrTiO3 (110) interface

• DOI: 10.1038/ncomms2804
• Publication Date: 2013-05-14T07:44:41Z
• Authors: A. Annadi; Q. Zhang; X. Renshaw Wang; N. Tuzla; K. Gopinadhan; W. M. Lü; A. Roy Barman; Z. Q. Liu; A. Srivastava; S. Saha; Y. L. Zhao; S. W. Zeng; S. Dhar; E. Olsson; B. Gu; S. Yunoki; S. Maekawa; H. Hilgenkamp; T. Venkatesan; Ariando
• Keywords: Magnetism; Discontinuity (linguistics)

The observation of a two dimensional electron gas (2DEG) (1, 2), superconductivity (3, 4), magnetic effects (5) and electronic phase separation (6-8) at the interfaces insulating oxides, especially LaAlO3/SrTiO3, has further enhanced potential complex oxides for novel electronics. occurrence 2DEG is strongly believed to be driven by polarization discontinuity (9) interface between oxides. In this scenario, crystal orientation plays an important role no conductivity would expected e.g., LaAlO3 (110)-oriented SrTiO3, which should not have (10, 11). Here, we report unexpected LaAlO3/SrTiO3 prepared on SrTiO3. was found anisotropic, with ratio conductance along different directions parallel substrate surface showing remarkable dependence oxygen pressure during deposition. its anisotropy are discussed based atomic structure interface, as revealed Scanning Transmission Electron Microscopy (STEM) supported density functional theory (DFT) calculations.