Year: 2010
Type: article
Abstract: Quasiparticle interference (QPI) in spectroscopic imaging scanning tunneling microscopy provides a powerful method to detect orbital band structures and orbital ordering patterns in transition-metal oxides. We use the $T$-matrix formalism to calculate the QPI spectra for the unconventional metamagnetic system of ${\text{Sr}}_{3}{\text{Ru}}_{2}{\text{O}}_{7}$ with a ${t}_{2g}$-orbital band structure. A detailed tight-binding model is constructed accounting for features such as spin-orbit coupling, bilayer splitting, and the staggered rotation of the RuO octahedra. The band parameters are chosen by fitting the calculated Fermi surfaces with those measured in the angular-resolved photoemission spectroscopy experiment. The calculated quasiparticle interference at zero magnetic field exhibits a hollow squarelike feature arising from the nesting of the quasi-one-dimensional ${d}_{xz}$ and ${d}_{yz}$ orbital bands, in agreement with recent measurements by Lee et al. [Nat. Phys. 5, 800 (2009)]. Rotational symmetry breaking in the nematic metamagnetic state also manifests in the quasiparticle interference spectra.
Source: Physical Review B
Authors: Wei-Cheng Lee, D. P. Arovas, Congjun Wu
Institution: University of California San Diego
Language: Latvian
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2089999537