We use scanning tunneling microscopy (STM) and quasiparticle interference (QPI) imaging to investigate the low-energy orbital texture of single-layer FeSe/SrTiO3. We develop a T-matrix model of multi-orbital QPI to disentangle scattering intensities from Fe 3dxz and 3dyz bands, enabling the use of STM as a nanoscale detection tool of nematicity. By sampling multiple spatial regions of a single-layer FeSe/SrTiO3 film, we quantitatively exclude static xz/yz orbital ordering with domain size larger than δr2 = 20 nm × 20 nm, xz/yz Fermi wave vector difference larger than δk = 0.014 π, and energy splitting larger than δE = 3.5 meV. The lack of detectable ordering pinned around defects places qualitative constraints on models of fluctuating nematicity.
@article{arxiv.1509.07110,
title = {Bounds on Nanoscale Nematicity in Single-Layer FeSe/SrTiO$_3$},
author = {Dennis Huang and Tatiana A. Webb and Shiang Fang and Can-Li Song and Cui-Zu Chang and Jagadeesh S. Moodera and Efthimios Kaxiras and Jennifer E. Hoffman},
journal= {arXiv preprint arXiv:1509.07110},
year = {2016}
}