Tuning up or down the critical thickness in LaAlO3/SrTiO3 through in situ deposition of metal overlayers

D. C. Vaz, E. Lesne, H. Naganuma, E. Jacquet, J. Santamaria, A. Barthélémy, M. Bibes

Research output: Contribution to journalArticlepeer-review


The quasi two-dimension electron system (q2DES) that forms at the interface between LaAlO3 (LAO) and SrTiO3 (STO) has attracted much attention from the oxide electronics community[1]. Indeed, it has emerged as a platform to test a cornucopia of low-dimensional physical effects, such as two-dimensional superconductivity[2], quantum Hall effect[3], spin-charge conversion through the inverse Rashba-Edelstein effect[4] or electron pairing without superconductivity[5], to name just a few. The LAO/STO q2DES possesses several hallmark features; one is the existence of a critical LAO thickness of 4 unit-cells (uc) for interfacial conductivity to emerge[6]. Another is the extreme sensitivity of its transport properties to electrostatic boundary conditions. This surface-interface coupling was previously exploited to modulate both carrier densities and mobilities of the q2DES through the controlled adsorption of polar solvents[711] and by capping with different materials[12,13]. More spectacularly, first-principles calculations have suggested that the critical thickness could be reduced to just 1 uc by covering the LAO film with specific metals[14], an effect we recently demonstrated experimentally for Co[15]. However, the underlying mechanism leading to the formation of the q2DES in these Co/LAO(1 uc)/STO samples remains unclear.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Aug 30


  • Interfaces
  • Magnetotransport
  • Two-dimensional electron gas
  • X-ray photoemission

ASJC Scopus subject areas

  • General

Fingerprint Dive into the research topics of 'Tuning up or down the critical thickness in LaAlO3/SrTiO3 through in situ deposition of metal overlayers'. Together they form a unique fingerprint.

Cite this