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@ARTICLE{Rubano:230898,
      author       = {Rubano, Andrea and De Luca, Gabriele and Schubert, Jürgen
                      and Wang, Zhe and Zhu, Shaobo and Schlom, Darrell G. and
                      Marrucci, Lorenzo and Paparo, Domenico},
      title        = {{P}olar asymmetry of
                      {L}a(1−δ){A}l(1+δ){O}3/{S}r{T}i{O}3 heterostructures
                      probed by optical second harmonic generation},
      journal      = {Applied physics letters},
      volume       = {107},
      number       = {10},
      issn         = {1077-3118},
      address      = {Melville, NY},
      publisher    = {American Inst. of Physics},
      reportid     = {FZJ-2015-05625},
      pages        = {101603 -},
      year         = {2015},
      abstract     = {By combining transport measurements and optical second
                      harmonic generation, we have investigated heterostructures
                      formed between crystalline thin films of LaAlO3, with
                      varyingstoichiometry and TiO2-terminated SrTiO3(001)
                      substrates. Optical second harmonic generationdirectly
                      probes the polarity of these heterostructures, thus
                      complementing the transport data. Thestoichiometry and the
                      growth temperature are found to be critical parameters for
                      controlling boththe interfacial conductivity and the
                      heterostructure polarity. In agreement with the previous
                      work,all of the samples display an insulator-to-metal
                      transition in the Al-reach region, with the
                      conductivityfirst increasing and then saturating at the
                      highest Al/La ratios. The second harmonic signalalso
                      increases as a function of the Al/La ratio, but, at the
                      highest growth temperature, it does notsaturate. This
                      unusual behavior is consistent with the formation of an
                      ordered structure of defectdipoles in the LaAlO3 film caused
                      by the off-centering of excess Al atoms in agreement with
                      thetheory.},
      cin          = {JARA-FIT / PGI-9},
      ddc          = {530},
      cid          = {$I:(DE-82)080009_20140620$ / I:(DE-Juel1)PGI-9-20110106},
      pnm          = {521 - Controlling Electron Charge-Based Phenomena
                      (POF3-521)},
      pid          = {G:(DE-HGF)POF3-521},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000361640200013},
      doi          = {10.1063/1.4930881},
      url          = {https://juser.fz-juelich.de/record/230898},
}