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

Abstract

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.

Authors:
 [1];  [2];  [3];  [3];  [3];  [1];  [4];  [5];  [1];  [1];  [1]
  1. Institute of Material Science of Barcelona (ICMAB-CSIC), Catalonia (Spain)
  2. PSL Univ., Paris (France). Lab. of Physics and Material studies
  3. PSL Univ., Paris (France). Lab. of Physics and Material studies
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. Complutense Madrid (Spain)
  5. Institute of Material Science of Barcelona (ICMAB-CSIC), Catalonia (Spain); Univ. Autonoma de Barcelona (Spain). Dept. of Physics
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1259677
Alternate Identifier(s):
OSTI ID: 1265456
Grant/Contract Number:  
RyC-2012-11709; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE

Citation Formats

Herranz, Gervasi, Singh, Gyanendra, Bergeal, Nicolas, Jouan, Alexis, Lesueur, Jérôme, Gázquez, Jaume, Varela, María, Scigaj, Mateusz, Dix, Nico, Sánchez, Florencio, and Fontcuberta, Josep. Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO3/SrTiO3 quantum wells by selective orbital occupancy. United States: N. p., 2015. Web. doi:10.1038/ncomms7028.
Herranz, Gervasi, Singh, Gyanendra, Bergeal, Nicolas, Jouan, Alexis, Lesueur, Jérôme, Gázquez, Jaume, Varela, María, Scigaj, Mateusz, Dix, Nico, Sánchez, Florencio, & Fontcuberta, Josep. Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO3/SrTiO3 quantum wells by selective orbital occupancy. United States. doi:10.1038/ncomms7028.
Herranz, Gervasi, Singh, Gyanendra, Bergeal, Nicolas, Jouan, Alexis, Lesueur, Jérôme, Gázquez, Jaume, Varela, María, Scigaj, Mateusz, Dix, Nico, Sánchez, Florencio, and Fontcuberta, Josep. Tue . "Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO3/SrTiO3 quantum wells by selective orbital occupancy". United States. doi:10.1038/ncomms7028. https://www.osti.gov/servlets/purl/1259677.
@article{osti_1259677,
title = {Engineering two-dimensional superconductivity and Rashba spin–orbit coupling in LaAlO3/SrTiO3 quantum wells by selective orbital occupancy},
author = {Herranz, Gervasi and Singh, Gyanendra and Bergeal, Nicolas and Jouan, Alexis and Lesueur, Jérôme and Gázquez, Jaume and Varela, María and Scigaj, Mateusz and Dix, Nico and Sánchez, Florencio and Fontcuberta, Josep},
abstractNote = {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.},
doi = {10.1038/ncomms7028},
journal = {Nature Communications},
number = ,
volume = 6,
place = {United States},
year = {2015},
month = {1}
}

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