Pesquera D, Scigaj M, Gargiani P, Barla A, Herrero-Martín J, Pellegrin E, Valvidares S M, Gázquez J, Varela M, Dix N, Fontcuberta J, Sánchez F, Herranz G
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain.
Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus de la UAB, Bellaterra E-08193, Catalonia, Spain and Departamento de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Catalonia, Spain.
Phys Rev Lett. 2014 Oct 10;113(15):156802. doi: 10.1103/PhysRevLett.113.156802. Epub 2014 Oct 7.
Recent findings show the emergence of two-dimensional electron gases (2DEGs) at LaAlO(3)/SrTiO(3) interfaces along different orientations; yet details on band reconstructions have remained so far unknown. Via x-ray linear dichroism spectroscopy, we demonstrate that crystal symmetry imposes distinctive 2DEG orbital hierarchies on (001)-and (110)-oriented quantum wells, allowing selective occupancy of states of different symmetry. Such orientational tuning expands the possibilities for electronic engineering of 2DEGs and opens up enticing opportunities to understand the link between orbital symmetry and complex correlated states at LaAlO(3)/SrTiO(3) quantum wells.
最近的研究结果表明，在沿不同取向的LaAlO(3)/SrTiO(3)界面出现了二维电子气（2DEG）；然而，迄今为止，关于能带重构的细节仍不为人知。通过X射线线性二色光谱，我们证明晶体对称性在（001）和（110）取向的量子阱上施加了独特的2DEG轨道层次结构，允许不同对称性的状态被选择性占据。这种取向调谐扩展了2DEG电子工程的可能性，并为理解LaAlO(3)/SrTiO(3)量子阱中轨道对称性与复杂关联态之间的联系提供了诱人的机会。
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