Artificial quantum confinement in LaAlO3/SrTiO3 heterostructures

Heterostructures of transition metal oxides perovskites represent an ideal platform to explore exotic phenomena involving the complex interplay between the spin, charge, orbital and lattice degrees of freedom available in these compounds. At the interface between such materials, this interplay can lead to phenomena that are present in none of the original constituents such as the formation of the interfacial two-dimensional electron system (2DES) discovered at the LAO3/STO3 (LAO/STO) interface. In samples prepared by growing a LAO layer onto a STO substrate, the 2DES is confined in a band bending potential well, whose width is set by the interface charge density and the STO dielectric properties, and determines the electronic band structure. Growing LAO(2 nm)/STO(x nm)/LAO(2 nm) heterostructures on STO substrates allows us to control the extension of the confining potential of the top 2DES via the thickness of the STO layer. In such samples, we explore the electronic structure trend under an increase of the confining potential with using soft x-ray angle-resolved photoemission spectroscopy combined with ab initio calculations. The results indicate that varying the thickness of the STO film modifies the quantization of the 3d t_2g bands and, interestingly, redistributes the charge between the d_xy and d_xz/d_yz bands.

    Organizational unit
    Triscone Group
    Creative Commons Attribution 4.0 International
Publication date09/03/2020
Retention date23/11/2030
accessLevelPublicAccess levelPublic
duaNoneContract on the use of data
  • Caputo, Marco
  • Boselli, Margherita
  • Filippetti, Aelssio
  • Lemal, Sébastien
  • Li, Danfeng
  • Chikina, A.
  • Cancellieri, Claudia
  • Schmitt, Thorsten
  • Gariglio, Stefano
  • Triscone, Jean-Marc
  • Strocov, Vladimir
  • Ghosez, Philippe
  • Quality (0 Reviews)
  • Usefulness (0 Reviews)

Datacite metadata

Packages information

Similar archives

Triscone Group
Generation of tunable stochastic sequences using the Insulator-Metal transition
2022 accessLevelPublic Public 22.4 MB
Triscone Group
Dynamics of the electrically induced insulator-to-metal transition in rare-earth nickelates - Phys. Rev. B 104 165141 (2021)
2021 accessLevelPublic Public 49.8 MB
Triscone Group
Structural and Electronic Properties of SrCuO2+delta Thin Films
2022 accessLevelPublic Public 83.1 MB
Triscone Group
Competition between carrier injection and structural distortions in electron-doped perovskite nickelate thin films
2023 accessLevelPublic Public 61.9 MB
All rights reserved by DLCM and the University of GenevaunigeBlack