Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO3/SrTiO3 quantum wells by selective orbital occupancy

Herranz, Gervasi; Singh, Gyanendra; Bergeal, Nicolas; Jouan, Alexis; Lesueur, Jérôme; Gázquez, Jaume; Varela, María; Scigaj, Mateusz; Dix, Nico; Sánchez, Florencio; Fontcuberta, Josep

doi:10.1038/ncomms7028

Title: Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO₃/SrTiO₃ quantum wells by selective orbital occupancy

Journal Article · Tue Jan 13 00:00:00 EST 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms7028· OSTI ID:1259677

Herranz, Gervasi ^[1]; Singh, Gyanendra ^[2]; Bergeal, Nicolas ^[3]; Jouan, Alexis ^[3]; Lesueur, Jérôme ^[3]; Gázquez, Jaume ^[1]; Varela, María ^[4]; Scigaj, Mateusz ^[5]; Dix, Nico ^[1]; Sánchez, Florencio ^[1]; Fontcuberta, Josep ^[1]

Institute of Material Science of Barcelona (ICMAB-CSIC), Catalonia (Spain)
PSL Univ., Paris (France). Lab. of Physics and Material studies
PSL Univ., Paris (France). Lab. of Physics and Material studies
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. Complutense Madrid (Spain)
Institute of Material Science of Barcelona (ICMAB-CSIC), Catalonia (Spain); Univ. Autonoma de Barcelona (Spain). Dept. of Physics

The discovery of two-dimensional electron gases (2DEGs) at oxide interfaces—involving electrons in narrow d-bands—has broken new ground, enabling the access to correlated states that are unreachable in conventional semiconductors based on s- and p- electrons. There is a growing consensus that emerging properties at these novel quantum wells—such as 2D superconductivity and magnetism --are intimately connected to specific orbital symmetries in the 2DEG sub-band structure. Here we show that crystal orientation allows selective orbital occupancy, disclosing unprecedented ways to tailor the 2DEG properties. By carrying out electrostatic gating experiments in LaAlO₃/SrTiO₃ wells of different crystal orientations, we show that the spatial extension and anisotropy of the 2D superconductivity and the Rashba spin–orbit field can be largely modulated by controlling the 2DEG sub-band filling. Such an orientational tuning expands the possibilities for electronic engineering of 2DEGs at LaAlO₃/SrTiO₃ interfaces.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: RyC-2012-11709; AC05-00OR22725

OSTI ID:: 1259677

Alternate ID(s):: OSTI ID: 1265456

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 132 works

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