Fig. 2: Symmetry-preserved strained-SRO monolayers.
From: Tuning orbital-selective phase transitions in a two-dimensional Hund’s correlated system
a Schematic diagram of an SRO monolayer on 10 unit cells (u.c.) of SrTiO3 (STO) and substrate. The SRO monolayer has a single RuO2 layer sandwiched between Sr–O layers. b, c Low-energy electron diffraction (LEED) images of SRO monolayers under −1.4 and +0.2% strain, with (m, n) and (m + 0.5, n + 0.5) peaks (m, n: integer). d Structural characterization of an SRO monolayer on an STO (10 u.c.)-SAGT substrate via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). A 10 u.c. STO capping layer protects the SRO from damage during measurements. e, f HAADF (e) and annular bright-field (ABF) images (f). There is a single RuO2 layer with abrupt interfaces without RuO6 octahedron rotation along the in-plane axis.
