Bounds on nanoscale nematicity in single-layer FeSe/SrTiO3

Dennis Huang; Tatiana A. Webb; Shiang Fang; Can Li Song; Cui Zu Chang; Jagadeesh S. Moodera; Efthimios Kaxiras; Jennifer E. Hoffman

doi:10.1103/PhysRevB.93.125129

Bounds on nanoscale nematicity in single-layer FeSe/SrTiO3

Dennis Huang, Tatiana A. Webb, Shiang Fang, Can Li Song, Cui Zu Chang, Jagadeesh S. Moodera, Efthimios Kaxiras, Jennifer E. Hoffman

Physics

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

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=20nm×20nm, xz/yz Fermi wave vector difference larger than δk=0.014π, and energy splitting larger than δE=3.5meV. The lack of detectable ordering pinned around defects places qualitative constraints on models of fluctuating nematicity.

Original language	English (US)
Article number	125129
Journal	Physical Review B
Volume	93
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevB.93.125129
State	Published - Mar 18 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.93.125129

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title = "Bounds on nanoscale nematicity in single-layer FeSe/SrTiO3",

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=20nm×20nm, xz/yz Fermi wave vector difference larger than δk=0.014π, and energy splitting larger than δE=3.5meV. The lack of detectable ordering pinned around defects places qualitative constraints on models of fluctuating nematicity.",

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AU - Huang, Dennis

AU - Webb, Tatiana A.

AU - Fang, Shiang

AU - Song, Can Li

AU - Chang, Cui Zu

AU - Moodera, Jagadeesh S.

AU - Kaxiras, Efthimios

AU - Hoffman, Jennifer E.

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AB - 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=20nm×20nm, xz/yz Fermi wave vector difference larger than δk=0.014π, and energy splitting larger than δE=3.5meV. The lack of detectable ordering pinned around defects places qualitative constraints on models of fluctuating nematicity.

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Bounds on nanoscale nematicity in single-layer FeSe/SrTiO3

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