Revealing the single electron pocket of FeSe in a single orthorhombic domain

Abstract

We measure the electronic structure of FeSe from within individual orthorhombic domains. Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beamspot (nano-ARPES), we identify clear stripe-like orthorhombic domains in FeSe with a length scale of approximately 1-5~$\mu$m. Our photoemission measurements of the Fermi surface and band structure within individual domains reveal a single electron pocket at the Brillouin zone corner. This result provides clear evidence for a one-electron pocket electronic structure of FeSe, observed without the application of uniaxial strain, and calls for further theoretical insight into this unusual Fermi surface topology. Our results also showcase the potential of nano-ARPES for the study of correlated materials with local domain structures.

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• Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe
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• Roadmap on Nanoscale Superconductivity for Quantum Technologies
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• Spatially-resolved electronic structure of stripe domains in IrTe${}_2$ through electronic structure microscopy
• Nanoscale visualization of the thermally-driven evolution of antiferromagnetic domains in FeTe thin films
• Multi-Atom Quasiparticle Scattering Interference for Superconductor Energy-Gap Symmetry Determination
• Resurgence of superconductivity and the role of $d_{xy}$ hole band in FeSe${}_{1-x}$Te${}_x$
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