L64.00003. Dependence of LaAlO3/SrTiO3 Electron Pairing Strength on Crystallographic Orientation

Presented by: Aditi Nethwewala


Abstract

Recently, it has been shown that superconductivity at the LaAlO3/SrTiO3 interface is essentially 1D in nature, and that the pairing mechanism appears to be linked to the boundaries of naturally formed X, Y and Z ferroelastic domains in SrTiO3 [1]. Here, we investigate the nature of the pairing mechanism in LaAlO3/SrTiO3 nanostructures by examining the electron pairing strength with respect to the crystallographic direction. We write 1D, cross-shaped electron waveguides or nanocrosses [2] at the LaAlO3/SrTiO3 interface using conductive atomic force microscope (c-AFM) lithography. The c-AFM lithography and device geometry together defines the X, Y and Z domain boundaries across the nanocross at low temperatures. A sinusoidal dependence is observed as the nanocross is rotated with respect to the crystallographic direction. This characteristic angular dependence helps to constrain and sharpen our understanding of the pairing mechanism at the interface and the role of ferroelastic domain structure.[1] Y. Pai et al., Physical review letters 120 (14), 147001 (2018)[2] A. Nethwewala et al., Nanoscale Horizons 4, 1194-1201 (2019)

Authors

  • Aditi Nethwewala
  • Hyungwoo Lee
  • Jianan Li
  • Megan Briggeman
  • Yuze Zhang
  • Tianyi Wang
  • Jung-Woo Lee
  • Chang-Beom Eom
  • Patrick Irvin
  • Jeremy Levy


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