Bounds on nanoscale nematicity in single-layerFeSe/SrTiO3

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Bounds on nanoscale nematicity in single-layerFeSe/SrTiO3

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Title: Bounds on nanoscale nematicity in single-layerFeSe/SrTiO3
Author: Huang, Dennis; Webb, Tatiana A.; Fang, Shiang; Song, Can-Li; Chang, Cui-Zu; Moodera, Jagadeesh S.; Kaxiras, Efthimios; Hoffman, Jennifer Eve

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Citation: Huang, Dennis, Tatiana A. Webb, Shiang Fang, Can-Li Song, Cui-Zu Chang, Jagadeesh S. Moodera, Efthimios Kaxiras, and Jennifer E. Hoffman. 2016. “Bounds on Nanoscale Nematicity in Single-layerFeSe/SrTiO3.” Physical Review B 93 (12) (March 18). doi:10.1103/physrevb.93.125129.
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Abstract: 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 multiorbital 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
Published Version: doi:10.1103/PhysRevB.93.125129
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