Bounds on Nanoscale Nematicity in Single-Layer FeSe/SrTiO${}_3$

Abstract

We use scanning tunneling microscopy (STM) and quasiparticle interference (QPI) imaging to investigate the low-energy orbital texture of single-layer FeSe/SrTiO${}_3$. We develop a $T$-matrix model of multi-orbital QPI to disentangle scattering intensities from Fe $3d_{xz}$ and $3d_{yz}$ bands, enabling the use of STM as a nanoscale detection tool of nematicity. By sampling multiple spatial regions of a single-layer FeSe/SrTiO${}_3$ film, we quantitatively exclude static $xz/yz$ orbital ordering with domain size larger than $\delta r^2$ = 20 nm $\times$ 20 nm, $xz/yz$ Fermi wave vector difference larger than $\delta k$ = 0.014 $\pi$, and energy splitting larger than $\delta E$ = 3.5 meV. The lack of detectable ordering pinned around defects places qualitative constraints on models of fluctuating nematicity.

11 pages, 13 figures

References in corpus (23)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Emergence of the nematic electronic state in FeSe
• Enhancement of superconductivity near a nematic quantum critical point
• Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor
• Lifting of xz/yz orbital degeneracy at the structural transition in detwinned FeSe
• Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors
• Plain s-wave superconductivity in single-layer FeSe on SrTiO3 probed by scanning tunneling microscopy
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Observation of two distinct $d_{xz}/d_{yz}$ band splittings in FeSe
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Enhanced superconductivity due to forward scattering in FeSe thin films on SrTiO3 substrates
• Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb doped SrTiO3 substrate
• Electron pairing in the presence of incipient bands in iron-based superconductors
• Interface enhanced electron-phonon coupling and high temperature superconductivity in potassium-coated ultra-thin FeSe films on SrTiO3
• Interpretation of scanning tunneling quasiparticle interference and impurity states in cuprates
• Model of Electronic Structure and Superconductivity in Orbitally Ordered FeSe
• Revealing the Empty-State Electronic Structure of Single-Unit-Cell FeSe/SrTiO${}_3$
• Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3
• Simultaneous emergence of superconductivity, inter-pocket scattering and nematic fluctuation in potassium-coated FeSe superconductor
• Glide-Plane Symmetry and Superconducting Gap Structure of Iron-Based Superconductors

Cited by in corpus (12)

• Monolayer FeSe on SrTiO${}_3$
• Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling
• Dumbbell Defects in FeSe Films: A Scanning Tunneling Microscopy and First-Principles Investigation
• Robust weak antilocalization due to spin-orbital entanglement in Dirac material Sr${}_3$SnO
• s${}_{\pm }$ pairing near a Lifshitz transition
• Heterostructural one-unit-cell FeSe/SrTiO3: from high-temperature superconductivity to topological states
• Edge states at nematic domain walls in FeSe films
• Molecular beam epitaxy of superconducting FeSe${}_x$Te${}_{1-x}$ thin films interfaced with magnetic topological insulators
• The study of intrinsic defect state of FeSe with scanning tunneling microscopy
• Orbital-dependent quasiparticle scattering interference in 3R-NbS2
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
• Pomeranchuk instability in the nematic phase of two monolayer FeSe/SrTiO3